Slow boot due to USB errors

[drago01]

Hi,

Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
(kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s

~19.4 seconds during initrd seems like a bit much ... looking at the
log output I have noticed this:

[    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
[    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
[    5.502190] usb 1-4: can't read configurations, error -71
[    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
[    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
[    7.699060] usb 1-4: can't read configurations, error -71
[    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
[    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
[    9.895854] usb 1-4: can't read configurations, error -71
[    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
[   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
[   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
[   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[   10.363208] usb 1-5: Product: FJ Camera
[   10.363212] usb 1-5: Manufacturer: Generic
[   10.363215] usb 1-5: SerialNumber: 200901010001
[   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
[   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
[   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
[   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
[   13.139731] usb 1-4: can't read configurations, error -71
[   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
[   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
[   15.489766] usb 1-4: can't read configurations, error -71
[   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
[   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
[   17.687328] usb 1-4: can't read configurations, error -71
[   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
[   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
[   19.884522] usb 1-4: can't read configurations, error -71
[   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
[   19.919050] PM: Starting manual resume from disk
[   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
mode. Opts: (null)
[   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd

So  the questions are 1) what do those message actually mean? Seems
like everything works anyway 2) why do those block the boot process
... its not like the root fs is on a usb driver or something.

Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
happens for pretty much every kernel for almost every but not all boot
ups).

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 007: ID 8087:07dc Intel Corp.
Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Any ideas where to investigate? Those error messages are really
cryptic and do not tell me anything.

Thanks

[Hans de Goede]

Hi,

On 05/10/2014 05:13 PM, drago01 wrote:
> Hi,
>
> Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
> (kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s
>
> ~19.4 seconds during initrd seems like a bit much ... looking at the
> log output I have noticed this:
>
> [    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
> [    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
> [    5.502190] usb 1-4: can't read configurations, error -71
> [    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
> [    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
> [    7.699060] usb 1-4: can't read configurations, error -71
> [    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
> [    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
> [    9.895854] usb 1-4: can't read configurations, error -71
> [    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
> [   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
> [   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
> [   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
> [   10.363208] usb 1-5: Product: FJ Camera
> [   10.363212] usb 1-5: Manufacturer: Generic
> [   10.363215] usb 1-5: SerialNumber: 200901010001
> [   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
> [   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
> [   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> [   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
> [   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
> [   13.139731] usb 1-4: can't read configurations, error -71
> [   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
> [   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
> [   15.489766] usb 1-4: can't read configurations, error -71
> [   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
> [   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
> [   17.687328] usb 1-4: can't read configurations, error -71
> [   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
> [   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
> [   19.884522] usb 1-4: can't read configurations, error -71
> [   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
> [   19.919050] PM: Starting manual resume from disk
> [   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
> mode. Opts: (null)
> [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
>
> So  the questions are 1) what do those message actually mean? Seems
> like everything works anyway 2) why do those block the boot process
> ... its not like the root fs is on a usb driver or something.
>
> Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
> happens for pretty much every kernel for almost every but not all boot
> ups).
>
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 007: ID 8087:07dc Intel Corp.
> Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
> Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> Any ideas where to investigate? Those error messages are really
> cryptic and do not tell me anything.

-71 means EPROTO, note the device causing these issues is likely not
in your lsusb output since it fails to enumerate.

linux/Documentation/usb/error-codes.txt says the following about EPROTO:

-EPROTO (*, **)         a) bitstuff error
                        b) no response packet received within the
                           prescribed bus turn-around time
                        c) unknown USB error

(*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
hardware problems such as bad devices (including firmware) or cables.

(**) This is also one of several codes that different kinds of host
controller use to indicate a transfer has failed because of device
disconnect.  In the interval before the hub driver starts disconnect
processing, devices may receive such fault reports for every request.

Your boot log indicated that eventually the device on Bus 1 port 4
does enumerate and is the "Elan Microelectronics Corp." device which
likely is a touchscreen or a touchpad (if this is a tablet device
with a keyboard dock). Possibly the cable from the touchpad / touchscreen
has a loose contact somewhere.

Regards,

Hans

[drago01]

On Sat, May 10, 2014 at 7:49 PM, Hans de Goede  wrote:
> Hi,
>
> On 05/10/2014 05:13 PM, drago01 wrote:
> > Hi,
> >
> > Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
> > (kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s
> >
> > ~19.4 seconds during initrd seems like a bit much ... looking at the
> > log output I have noticed this:
> >
> > [    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
> > [    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [    5.502190] usb 1-4: can't read configurations, error -71
> > [    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
> > [    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [    7.699060] usb 1-4: can't read configurations, error -71
> > [    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
> > [    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [    9.895854] usb 1-4: can't read configurations, error -71
> > [    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
> > [   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
> > [   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
> > [   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
> > [   10.363208] usb 1-5: Product: FJ Camera
> > [   10.363212] usb 1-5: Manufacturer: Generic
> > [   10.363215] usb 1-5: SerialNumber: 200901010001
> > [   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
> > [   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
> > [   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > [   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
> > [   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [   13.139731] usb 1-4: can't read configurations, error -71
> > [   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
> > [   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [   15.489766] usb 1-4: can't read configurations, error -71
> > [   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
> > [   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [   17.687328] usb 1-4: can't read configurations, error -71
> > [   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
> > [   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
> > [   19.884522] usb 1-4: can't read configurations, error -71
> > [   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
> > [   19.919050] PM: Starting manual resume from disk
> > [   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
> > mode. Opts: (null)
> > [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
> >
> > So  the questions are 1) what do those message actually mean? Seems
> > like everything works anyway 2) why do those block the boot process
> > ... its not like the root fs is on a usb driver or something.
> >
> > Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
> > happens for pretty much every kernel for almost every but not all boot
> > ups).
> >
> > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > Bus 001 Device 007: ID 8087:07dc Intel Corp.
> > Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
> > Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
> > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> >
> > Any ideas where to investigate? Those error messages are really
> > cryptic and do not tell me anything.
>
> -71 means EPROTO, note the device causing these issues is likely not
> in your lsusb output since it fails to enumerate.
>
> linux/Documentation/usb/error-codes.txt says the following about EPROTO:
>
> -EPROTO (*, **)         a) bitstuff error
>                         b) no response packet received within the
>                            prescribed bus turn-around time
>                         c) unknown USB error
>
> (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> hardware problems such as bad devices (including firmware) or cables.
>
> (**) This is also one of several codes that different kinds of host
> controller use to indicate a transfer has failed because of device
> disconnect.  In the interval before the hub driver starts disconnect
> processing, devices may receive such fault reports for every request.
>
> Your boot log indicated that eventually the device on Bus 1 port 4
> does enumerate and is the "Elan Microelectronics Corp." device which
> likely is a touchscreen or a touchpad (if this is a tablet device
> with a keyboard dock). Possibly the cable from the touchpad / touchscreen
> has a loose contact somewhere.

I know that 1-4 is the touchscreen (its an ultrabook with a
touchscreen) ... the touchscreen itself works just fine though.
So if it takes more time / attempts to enumerate it and it works
eventually anyway why do we block boot on it?
The only effect of it is slow boot. Also not sure about the loose
cable thing ... its a not so old laptop why would the cable be
suddenly be lose?

[Hans de Goede]

Hi,

On 05/10/2014 08:00 PM, drago01 wrote:
> On Sat, May 10, 2014 at 7:49 PM, Hans de Goede  wrote:
> > Hi,
> >
> > On 05/10/2014 05:13 PM, drago01 wrote:
> > > Hi,
> > >
> > > Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
> > > (kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s
> > >
> > > ~19.4 seconds during initrd seems like a bit much ... looking at the
> > > log output I have noticed this:
> > >
> > > [    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
> > > [    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [    5.502190] usb 1-4: can't read configurations, error -71
> > > [    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
> > > [    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [    7.699060] usb 1-4: can't read configurations, error -71
> > > [    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
> > > [    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [    9.895854] usb 1-4: can't read configurations, error -71
> > > [    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > [   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
> > > [   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
> > > [   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
> > > [   10.363208] usb 1-5: Product: FJ Camera
> > > [   10.363212] usb 1-5: Manufacturer: Generic
> > > [   10.363215] usb 1-5: SerialNumber: 200901010001
> > > [   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
> > > [   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
> > > [   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > [   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
> > > [   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [   13.139731] usb 1-4: can't read configurations, error -71
> > > [   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
> > > [   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [   15.489766] usb 1-4: can't read configurations, error -71
> > > [   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
> > > [   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [   17.687328] usb 1-4: can't read configurations, error -71
> > > [   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
> > > [   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > [   19.884522] usb 1-4: can't read configurations, error -71
> > > [   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > [   19.919050] PM: Starting manual resume from disk
> > > [   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
> > > mode. Opts: (null)
> > > [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
> > >
> > > So  the questions are 1) what do those message actually mean? Seems
> > > like everything works anyway 2) why do those block the boot process
> > > ... its not like the root fs is on a usb driver or something.
> > >
> > > Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
> > > happens for pretty much every kernel for almost every but not all boot
> > > ups).
> > >
> > > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > > Bus 001 Device 007: ID 8087:07dc Intel Corp.
> > > Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
> > > Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
> > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > >
> > > Any ideas where to investigate? Those error messages are really
> > > cryptic and do not tell me anything.
> >
> > -71 means EPROTO, note the device causing these issues is likely not
> > in your lsusb output since it fails to enumerate.
> >
> > linux/Documentation/usb/error-codes.txt says the following about EPROTO:
> >
> > -EPROTO (*, **)         a) bitstuff error
> >                         b) no response packet received within the
> >                            prescribed bus turn-around time
> >                         c) unknown USB error
> >
> > (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> > hardware problems such as bad devices (including firmware) or cables.
> >
> > (**) This is also one of several codes that different kinds of host
> > controller use to indicate a transfer has failed because of device
> > disconnect.  In the interval before the hub driver starts disconnect
> > processing, devices may receive such fault reports for every request.
> >
> > Your boot log indicated that eventually the device on Bus 1 port 4
> > does enumerate and is the "Elan Microelectronics Corp." device which
> > likely is a touchscreen or a touchpad (if this is a tablet device
> > with a keyboard dock). Possibly the cable from the touchpad / touchscreen
> > has a loose contact somewhere.
>
> I know that 1-4 is the touchscreen (its an ultrabook with a
> touchscreen) ... the touchscreen itself works just fine though.
> So if it takes more time / attempts to enumerate it and it works
> eventually anyway why do we block boot on it?

That is a question for the systemd people / list.
> The only effect of it is slow boot. Also not sure about the loose
> cable thing ... its a not so old laptop why would the cable be
> suddenly be lose?

I had my laptop display die on me in the first few weeks, since it is
not old, chances are your laptop is still in the infant mortality part
of the bathtub curve: http://www.weibull.com/hotwire/issue21/ht21_1.gif

And even if it is not hardware does fail. As
linux/Documentation/usb/error-codes.txt says, and so does my own
experience these type of errors typically come from hardware problems.

Regards,

Hans

[poma]

On 11.05.2014 08:37, Hans de Goede wrote:
> Hi,
>
> On 05/10/2014 08:00 PM, drago01 wrote:
> > On Sat, May 10, 2014 at 7:49 PM, Hans de Goede  wrote:
> > > Hi,
> > >
> > > On 05/10/2014 05:13 PM, drago01 wrote:
> > > > Hi,
> > > >
> > > > Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
> > > > (kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s
> > > >
> > > > ~19.4 seconds during initrd seems like a bit much ... looking at the
> > > > log output I have noticed this:
> > > >
> > > > [    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
> > > > [    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [    5.502190] usb 1-4: can't read configurations, error -71
> > > > [    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
> > > > [    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [    7.699060] usb 1-4: can't read configurations, error -71
> > > > [    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
> > > > [    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [    9.895854] usb 1-4: can't read configurations, error -71
> > > > [    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > > [   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
> > > > [   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
> > > > [   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
> > > > [   10.363208] usb 1-5: Product: FJ Camera
> > > > [   10.363212] usb 1-5: Manufacturer: Generic
> > > > [   10.363215] usb 1-5: SerialNumber: 200901010001
> > > > [   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
> > > > [   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
> > > > [   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > > [   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
> > > > [   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [   13.139731] usb 1-4: can't read configurations, error -71
> > > > [   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
> > > > [   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [   15.489766] usb 1-4: can't read configurations, error -71
> > > > [   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
> > > > [   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [   17.687328] usb 1-4: can't read configurations, error -71
> > > > [   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
> > > > [   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > [   19.884522] usb 1-4: can't read configurations, error -71
> > > > [   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > > [   19.919050] PM: Starting manual resume from disk
> > > > [   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
> > > > mode. Opts: (null)
> > > > [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
> > > >
> > > > So  the questions are 1) what do those message actually mean? Seems
> > > > like everything works anyway 2) why do those block the boot process
> > > > ... its not like the root fs is on a usb driver or something.
> > > >
> > > > Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
> > > > happens for pretty much every kernel for almost every but not all boot
> > > > ups).
> > > >
> > > > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > > > Bus 001 Device 007: ID 8087:07dc Intel Corp.
> > > > Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
> > > > Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
> > > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > >
> > > > Any ideas where to investigate? Those error messages are really
> > > > cryptic and do not tell me anything.
> > >
> > > -71 means EPROTO, note the device causing these issues is likely not
> > > in your lsusb output since it fails to enumerate.
> > >
> > > linux/Documentation/usb/error-codes.txt says the following about EPROTO:
> > >
> > > -EPROTO (*, **)         a) bitstuff error
> > >                         b) no response packet received within the
> > >                            prescribed bus turn-around time
> > >                         c) unknown USB error
> > >
> > > (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> > > hardware problems such as bad devices (including firmware) or cables.
> > >
> > > (**) This is also one of several codes that different kinds of host
> > > controller use to indicate a transfer has failed because of device
> > > disconnect.  In the interval before the hub driver starts disconnect
> > > processing, devices may receive such fault reports for every request.
> > >
> > > Your boot log indicated that eventually the device on Bus 1 port 4
> > > does enumerate and is the "Elan Microelectronics Corp." device which
> > > likely is a touchscreen or a touchpad (if this is a tablet device
> > > with a keyboard dock). Possibly the cable from the touchpad / touchscreen
> > > has a loose contact somewhere.
> >
> > I know that 1-4 is the touchscreen (its an ultrabook with a
> > touchscreen) ... the touchscreen itself works just fine though.
> > So if it takes more time / attempts to enumerate it and it works
> > eventually anyway why do we block boot on it?
>
> That is a question for the systemd people / list.

systemd-devel@, WTF!? :)
systemd ain't kernel!
> > The only effect of it is slow boot. Also not sure about the loose
> > cable thing ... its a not so old laptop why would the cable be
> > suddenly be lose?
>
> I had my laptop display die on me in the first few weeks, since it is
> not old, chances are your laptop is still in the infant mortality part
> of the bathtub curve: http://www.weibull.com/hotwire/issue21/ht21_1.gif
>
> And even if it is not hardware does fail. As
> linux/Documentation/usb/error-codes.txt says, and so does my own
> experience these type of errors typically come from hardware problems.
>
> Regards,
>
> Hans

This is an example of a faulty wiring, 
...
[    1.034653] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.233643] usb 2-3: device descriptor read/64, error -71
[    1.728627] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.116663] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.315730] usb 2-3: device descriptor read/64, error -71
[    2.615645] usb 2-3: device descriptor read/64, error -71
[    2.820711] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.019698] usb 2-3: device descriptor read/64, error -71
[    3.506694] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.892698] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    4.278694] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.663694] usb 2-3: new high-speed USB device number 9 using ehci-pci
[    4.861637] usb 2-3: device descriptor read/64, error -71
[    5.347636] usb 2-3: new high-speed USB device number 10 using ehci-pci
[    5.732694] usb 2-3: new high-speed USB device number 11 using ehci-pci
[    5.930693] usb 2-3: device descriptor read/64, error -71
[    6.416693] usb 2-3: new high-speed USB device number 12 using ehci-pci
[    6.801692] usb 2-3: new high-speed USB device number 13 using ehci-pci
[    7.186693] usb 2-3: new high-speed USB device number 14 using ehci-pci
[    7.571692] usb 2-3: new high-speed USB device number 15 using ehci-pci
[    7.956637] usb 2-3: new high-speed USB device number 16 using ehci-pci
[    8.341692] usb 2-3: new high-speed USB device number 17 using ehci-pci
[    8.726692] usb 2-3: new high-speed USB device number 18 using ehci-pci
[    9.111690] usb 2-3: new high-speed USB device number 19 using ehci-pci
[    9.496691] usb 2-3: new high-speed USB device number 20 using ehci-pci
[    9.881695] usb 2-3: new high-speed USB device number 21 using ehci-pci
[   10.266632] usb 2-3: new high-speed USB device number 22 using ehci-pci
[   10.651690] usb 2-3: new high-speed USB device number 23 using ehci-pci
[   10.849699] usb 2-3: device descriptor read/64, error -71
[   11.148690] usb 2-3: device descriptor read/64, error -71
[   11.352691] usb 2-3: new high-speed USB device number 24 using ehci-pci
[   11.737690] usb 2-3: new high-speed USB device number 25 using ehci-pci
[   12.122690] usb 2-3: new high-speed USB device number 26 using ehci-pci
[   12.507691] usb 2-3: new high-speed USB device number 27 using ehci-pci
[   12.892695] usb 2-3: new high-speed USB device number 28 using ehci-pci
[   13.277631] usb 2-3: new high-speed USB device number 29 using ehci-pci
[   13.661691] usb 2-3: new high-speed USB device number 30 using ehci-pci
[   14.045692] usb 2-3: new high-speed USB device number 31 using ehci-pci
[   14.429630] usb 2-3: new high-speed USB device number 32 using ehci-pci
[   14.813702] usb 2-3: new high-speed USB device number 33 using ehci-pci
[   15.197690] usb 2-3: new high-speed USB device number 34 using ehci-pci
[   15.581630] usb 2-3: new high-speed USB device number 35 using ehci-pci
[   15.965692] usb 2-3: new high-speed USB device number 36 using ehci-pci
[   16.349688] usb 2-3: new high-speed USB device number 37 using ehci-pci
[   16.733689] usb 2-3: new high-speed USB device number 38 using ehci-pci
[   17.117633] usb 2-3: new high-speed USB device number 39 using ehci-pci
[   17.501688] usb 2-3: new high-speed USB device number 40 using ehci-pci
[   17.885640] usb 2-3: new high-speed USB device number 41 using ehci-pci
[   18.269688] usb 2-3: new high-speed USB device number 42 using ehci-pci
[   18.653687] usb 2-3: new high-speed USB device number 43 using ehci-pci
[   19.037691] usb 2-3: new high-speed USB device number 44 using ehci-pci
[   19.421689] usb 2-3: new high-speed USB device number 45 using ehci-pci
[   19.805687] usb 2-3: new high-speed USB device number 46 using ehci-pci
[   20.189629] usb 2-3: new high-speed USB device number 47 using ehci-pci
[   20.573628] usb 2-3: new high-speed USB device number 48 using ehci-pci
[   20.957691] usb 2-3: new high-speed USB device number 49 using ehci-pci
[   21.341687] usb 2-3: new high-speed USB device number 50 using ehci-pci
[   21.725687] usb 2-3: new high-speed USB device number 51 using ehci-pci
[   21.922691] usb 2-3: device descriptor read/64, error -71
[   22.407627] usb 2-3: new high-speed USB device number 52 using ehci-pci
[   22.791686] usb 2-3: new high-speed USB device number 53 using ehci-pci
[   23.175685] usb 2-3: new high-speed USB device number 54 using ehci-pci
[   23.559686] usb 2-3: new high-speed USB device number 55 using ehci-pci
[   23.943690] usb 2-3: new high-speed USB device number 56 using ehci-pci
[   24.140626] usb 2-3: device descriptor read/64, error -71
[   24.625626] usb 2-3: new high-speed USB device number 57 using ehci-pci
[   25.009630] usb 2-3: new high-speed USB device number 58 using ehci-pci
[   25.393685] usb 2-3: new high-speed USB device number 59 using ehci-pci
[   25.777685] usb 2-3: new high-speed USB device number 60 using ehci-pci
[   26.161685] usb 2-3: new high-speed USB device number 61 using ehci-pci
[   26.545685] usb 2-3: new high-speed USB device number 62 using ehci-pci
[   26.929688] usb 2-3: new high-speed USB device number 63 using ehci-pci
[   27.126625] usb 2-3: device descriptor read/64, error -71
[   27.424625] usb 2-3: device descriptor read/64, error -71
[   27.627625] usb 2-3: new high-speed USB device number 64 using ehci-pci
[   28.011634] usb 2-3: new high-speed USB device number 65 using ehci-pci
[   28.395683] usb 2-3: new high-speed USB device number 66 using ehci-pci
[   28.779683] usb 2-3: new high-speed USB device number 67 using ehci-pci
[   28.976682] usb 2-3: device descriptor read/64, error -71
[   29.461685] usb 2-3: new high-speed USB device number 68 using ehci-pci
[   29.845692] usb 2-3: new high-speed USB device number 69 using ehci-pci
[   30.304617] usb 4-3: new full-speed USB device number 2 using ohci-pci
[   35.485636] usb 4-3: not running at top speed; connect to a high speed hub
[   35.502401] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[   35.504571] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   35.506713] usb 4-3: Product: Flash Disk      
[   35.508857] usb 4-3: Manufacturer: USB     
[   36.585998] usb-storage 4-3:1.0: USB Mass Storage device detected
[   36.586151] scsi8 : usb-storage 4-3:1.0
[   36.586243] usbcore: registered new interface driver usb-storage
[  189.039504] usb 4-3: USB disconnect, device number 2
[  196.595288] usb 2-3: new high-speed USB device number 70 using ehci-pci
[  196.792292] usb 2-3: device descriptor read/64, error -71
[  197.090325] usb 2-3: device descriptor read/64, error -71
[  197.293389] usb 2-3: new high-speed USB device number 71 using ehci-pci
[  197.490306] usb 2-3: device descriptor read/64, error -71
[  197.788337] usb 2-3: device descriptor read/64, error -71
[  197.991368] usb 2-3: new high-speed USB device number 72 using ehci-pci
[  198.455344] usb 2-3: device not accepting address 72, error -71
[  198.557382] usb 2-3: new high-speed USB device number 73 using ehci-pci
[  199.021366] usb 2-3: device not accepting address 73, error -71
[  199.021456] hub 2-0:1.0: unable to enumerate USB device on port 3
[  199.259454] usb 2-3: new high-speed USB device number 74 using ehci-pci
[  199.456434] usb 2-3: device descriptor read/64, error -71
[  199.755478] usb 2-3: device descriptor read/64, error -71
[  199.958446] usb 2-3: new high-speed USB device number 75 using ehci-pci
[  200.155467] usb 2-3: device descriptor read/64, error -71
[  200.454457] usb 2-3: device descriptor read/64, error -71
[  200.657508] usb 2-3: new high-speed USB device number 76 using ehci-pci
[  201.119465] usb 2-3: device not accepting address 76, error -71
[  201.221519] usb 2-3: new high-speed USB device number 77 using ehci-pci
[  201.683482] usb 2-3: device not accepting address 77, error -71
[  201.683541] hub 2-0:1.0: unable to enumerate USB device on port 3
[  201.921590] usb 2-3: new high-speed USB device number 78 using ehci-pci
[  202.117621] usb 2-3: device descriptor read/64, error -71
[  202.414579] usb 2-3: device descriptor read/64, error -71
[  202.617659] usb 2-3: new high-speed USB device number 79 using ehci-pci
[  202.813557] usb 2-3: device descriptor read/64, error -71
[  203.110611] usb 2-3: device descriptor read/64, error -71
[  203.313623] usb 2-3: new high-speed USB device number 80 using ehci-pci
[  203.775537] usb 2-3: device not accepting address 80, error -71
[  203.877689] usb 2-3: new high-speed USB device number 81 using ehci-pci
[  204.339613] usb 2-3: device not accepting address 81, error -71
[  204.339695] hub 2-0:1.0: unable to enumerate USB device on port 3
[  204.578671] usb 2-3: new high-speed USB device number 82 using ehci-pci
[  204.774653] usb 2-3: device descriptor read/64, error -71
[  205.071673] usb 2-3: device descriptor read/64, error -71
[  205.274641] usb 2-3: new high-speed USB device number 83 using ehci-pci
[  205.470672] usb 2-3: device descriptor read/64, error -71
[  205.767698] usb 2-3: device descriptor read/64, error -71
[  205.970671] usb 2-3: new high-speed USB device number 84 using ehci-pci
[  206.432703] usb 2-3: device not accepting address 84, error -71
[  206.534753] usb 2-3: new high-speed USB device number 85 using ehci-pci
[  206.996704] usb 2-3: device not accepting address 85, error -71
[  206.996774] hub 2-0:1.0: unable to enumerate USB device on port 3
[  207.234764] usb 2-3: new high-speed USB device number 86 using ehci-pci
[  207.430794] usb 2-3: device descriptor read/64, error -71
[  207.727750] usb 2-3: device descriptor read/64, error -71
[  207.930820] usb 2-3: new high-speed USB device number 87 using ehci-pci
[  208.126828] usb 2-3: device descriptor read/64, error -71
[  208.423833] usb 2-3: device descriptor read/64, error -71
[  208.626865] usb 2-3: new high-speed USB device number 88 using ehci-pci
[  209.088800] usb 2-3: device not accepting address 88, error -71
[  209.190948] usb 2-3: new high-speed USB device number 89 using ehci-pci
[  209.653917] usb 2-3: device not accepting address 89, error -71
[  209.654013] hub 2-0:1.0: unable to enumerate USB device on port 3
[  209.892898] usb 2-3: new high-speed USB device number 90 using ehci-pci
[  210.088899] usb 2-3: device descriptor read/64, error -71
[  210.385882] usb 2-3: device descriptor read/64, error -71
[  210.588859] usb 2-3: new high-speed USB device number 91 using ehci-pci
[  210.784901] usb 2-3: device descriptor read/64, error -71
[  211.081926] usb 2-3: device descriptor read/64, error -71
[  211.284970] usb 2-3: new high-speed USB device number 92 using ehci-pci
[  211.747895] usb 2-3: device not accepting address 92, error -71
[  211.849983] usb 2-3: new high-speed USB device number 93 using ehci-pci
[  212.313956] usb 2-3: device not accepting address 93, error -71
[  212.314047] hub 2-0:1.0: unable to enumerate USB device on port 3
[  212.552948] usb 2-3: new high-speed USB device number 94 using ehci-pci
[  212.750024] usb 2-3: device descriptor read/64, error -71
[  213.048029] usb 2-3: device descriptor read/64, error -71
[  213.251078] usb 2-3: new high-speed USB device number 95 using ehci-pci
[  213.448054] usb 2-3: device descriptor read/64, error -71
[  213.746097] usb 2-3: device descriptor read/64, error -71
[  213.949111] usb 2-3: new high-speed USB device number 96 using ehci-pci
[  214.413079] usb 2-3: device not accepting address 96, error -71
[  214.515130] usb 2-3: new high-speed USB device number 97 using ehci-pci
[  214.979170] usb 2-3: device not accepting address 97, error -71
[  214.979270] hub 2-0:1.0: unable to enumerate USB device on port 3
[  215.217181] usb 2-3: new high-speed USB device number 98 using ehci-pci
[  215.414186] usb 2-3: device descriptor read/64, error -71
[  215.712193] usb 2-3: device descriptor read/64, error -71
[  215.915213] usb 2-3: new high-speed USB device number 99 using ehci-pci
[  216.113216] usb 2-3: device descriptor read/64, error -71
[  216.411240] usb 2-3: device descriptor read/64, error -71
[  216.615224] usb 2-3: new high-speed USB device number 100 using ehci-pci
[  217.080226] usb 2-3: device not accepting address 100, error -71
[  217.182349] usb 2-3: new high-speed USB device number 101 using ehci-pci
[  217.646248] usb 2-3: device not accepting address 101, error -71
[  217.646346] hub 2-0:1.0: unable to enumerate USB device on port 3
[  217.884377] usb 2-3: new high-speed USB device number 102 using ehci-pci
[  218.081325] usb 2-3: device descriptor read/64, error -71
[  218.379338] usb 2-3: device descriptor read/64, error -71
[  218.582357] usb 2-3: new high-speed USB device number 103 using ehci-pci
[  218.779362] usb 2-3: device descriptor read/64, error -71
[  219.077363] usb 2-3: device descriptor read/64, error -71
[  219.280375] usb 2-3: new high-speed USB device number 104 using ehci-pci
[  219.744425] usb 2-3: device not accepting address 104, error -71
[  219.846484] usb 2-3: new high-speed USB device number 105 using ehci-pci
[  220.310372] usb 2-3: device not accepting address 105, error -71
[  220.310433] hub 2-0:1.0: unable to enumerate USB device on port 3
[  220.548380] usb 2-3: new high-speed USB device number 106 using ehci-pci
[  220.744445] usb 2-3: device descriptor read/64, error -71
[  221.042434] usb 2-3: device descriptor read/64, error -71
[  221.246486] usb 2-3: new high-speed USB device number 107 using ehci-pci
[  221.442514] usb 2-3: device descriptor read/64, error -71
[  221.739466] usb 2-3: device descriptor read/64, error -71
[  221.942551] usb 2-3: new high-speed USB device number 108 using ehci-pci
[  222.404487] usb 2-3: device not accepting address 108, error -71
[  222.506635] usb 2-3: new high-speed USB device number 109 using ehci-pci
[  222.968539] usb 2-3: device not accepting address 109, error -71
[  222.968633] hub 2-0:1.0: unable to enumerate USB device on port 3
[  223.206608] usb 2-3: new high-speed USB device number 110 using ehci-pci
[  223.402674] usb 2-3: device descriptor read/64, error -71
[  223.699610] usb 2-3: device descriptor read/64, error -71
[  223.902717] usb 2-3: new high-speed USB device number 111 using ehci-pci
[  224.098646] usb 2-3: device descriptor read/64, error -71
[  224.395646] usb 2-3: device descriptor read/64, error -71
[  224.598657] usb 2-3: new high-speed USB device number 112 using ehci-pci
[  225.060664] usb 2-3: device not accepting address 112, error -71
[  225.162775] usb 2-3: new high-speed USB device number 113 using ehci-pci
[  225.624674] usb 2-3: device not accepting address 113, error -71
[  225.624750] hub 2-0:1.0: unable to enumerate USB device on port 3
[  225.862731] usb 2-3: new high-speed USB device number 114 using ehci-pci
[  226.058715] usb 2-3: device descriptor read/64, error -71
[  226.355780] usb 2-3: device descriptor read/64, error -71
[  226.558788] usb 2-3: new high-speed USB device number 115 using ehci-pci
[  226.754711] usb 2-3: device descriptor read/64, error -71
[  227.051758] usb 2-3: device descriptor read/64, error -71
[  227.254907] usb 2-3: new high-speed USB device number 116 using ehci-pci
[  227.716804] usb 2-3: device not accepting address 116, error -71
[  227.818848] usb 2-3: new high-speed USB device number 117 using ehci-pci
[  228.280900] usb 2-3: device not accepting address 117, error -71
[  228.281000] hub 2-0:1.0: unable to enumerate USB device on port 3
[  228.518967] usb 2-3: new high-speed USB device number 118 using ehci-pci
[  228.715871] usb 2-3: device descriptor read/64, error -71
[  229.012995] usb 2-3: device descriptor read/64, error -71
[  229.215926] usb 2-3: new high-speed USB device number 119 using ehci-pci
[  229.411928] usb 2-3: device descriptor read/64, error -71
[  229.709972] usb 2-3: device descriptor read/64, error -71
[  229.912978] usb 2-3: new high-speed USB device number 120 using ehci-pci
[  230.375958] usb 2-3: device not accepting address 120, error -71
[  230.478025] usb 2-3: new high-speed USB device number 121 using ehci-pci
[  230.940980] usb 2-3: device not accepting address 121, error -71
[  230.941060] hub 2-0:1.0: unable to enumerate USB device on port 3
[  231.179059] usb 2-3: new high-speed USB device number 122 using ehci-pci
[  231.376061] usb 2-3: device descriptor read/64, error -71
[  231.674086] usb 2-3: device descriptor read/64, error -71
[  231.877075] usb 2-3: new high-speed USB device number 123 using ehci-pci
[  232.074059] usb 2-3: device descriptor read/64, error -71
[  232.372111] usb 2-3: device descriptor read/64, error -71
[  232.575112] usb 2-3: new high-speed USB device number 124 using ehci-pci
[  233.040175] usb 2-3: device not accepting address 124, error -71
[  233.142206] usb 2-3: new high-speed USB device number 125 using ehci-pci
[  233.607063] usb 2-3: device not accepting address 125, error -71
[  233.607097] hub 2-0:1.0: unable to enumerate USB device on port 3
[  233.845277] usb 2-3: new high-speed USB device number 126 using ehci-pci
[  234.042287] usb 2-3: device descriptor read/64, error -71
[  234.340241] usb 2-3: device descriptor read/64, error -71
[  234.543318] usb 2-3: new high-speed USB device number 127 using ehci-pci
[  234.740264] usb 2-3: device descriptor read/64, error -71
[  235.039347] usb 2-3: device descriptor read/64, error -71
[  235.242355] usb 2-3: new high-speed USB device number 2 using ehci-pci
[  235.706244] usb 2-3: device not accepting address 2, error -71
[  235.808336] usb 2-3: new high-speed USB device number 3 using ehci-pci
[  236.272281] usb 2-3: device not accepting address 3, error -71
[  236.272366] hub 2-0:1.0: unable to enumerate USB device on port 3
[  236.510370] usb 2-3: new high-speed USB device number 4 using ehci-pci
[  236.708352] usb 2-3: device descriptor read/64, error -71
[  237.006461] usb 2-3: device descriptor read/64, error -71
[  237.209415] usb 2-3: new high-speed USB device number 5 using ehci-pci
[  237.406423] usb 2-3: device descriptor read/64, error -71
[  237.704500] usb 2-3: device descriptor read/64, error -71
[  237.907517] usb 2-3: new high-speed USB device number 6 using ehci-pci
[  238.371365] usb 2-3: device not accepting address 6, error -71
[  238.473496] usb 2-3: new high-speed USB device number 7 using ehci-pci
[  238.935440] usb 2-3: device not accepting address 7, error -71
[  238.935535] hub 2-0:1.0: unable to enumerate USB device on port 3
[  239.173538] usb 2-3: new high-speed USB device number 8 using ehci-pci
[  239.369497] usb 2-3: device descriptor read/64, error -71
[  239.666619] usb 2-3: device descriptor read/64, error -71
[  239.869488] usb 2-3: new high-speed USB device number 9 using ehci-pci
[  240.065586] usb 2-3: device descriptor read/64, error -71
[  240.362568] usb 2-3: device descriptor read/64, error -71
[  240.565612] usb 2-3: new high-speed USB device number 10 using ehci-pci
[  241.027589] usb 2-3: device not accepting address 10, error -71
[  241.129641] usb 2-3: new high-speed USB device number 11 using ehci-pci
[  241.591625] usb 2-3: device not accepting address 11, error -71
[  241.591723] hub 2-0:1.0: unable to enumerate USB device on port 3
[  241.830685] usb 2-3: new high-speed USB device number 12 using ehci-pci
[  242.026756] usb 2-3: device descriptor read/64, error -71
[  242.324714] usb 2-3: device descriptor read/64, error -71
[  242.527792] usb 2-3: new high-speed USB device number 13 using ehci-pci
[  242.723791] usb 2-3: device descriptor read/64, error -71
[  243.020816] usb 2-3: device descriptor read/64, error -71
[  243.223829] usb 2-3: new high-speed USB device number 14 using ehci-pci
[  243.685792] usb 2-3: device not accepting address 14, error -71
[  243.787878] usb 2-3: new high-speed USB device number 15 using ehci-pci
[  244.249774] usb 2-3: device not accepting address 15, error -71
[  244.249868] hub 2-0:1.0: unable to enumerate USB device on port 3
[  244.487858] usb 2-3: new high-speed USB device number 16 using ehci-pci
[  244.683854] usb 2-3: device descriptor read/64, error -71
[  244.980934] usb 2-3: device descriptor read/64, error -71
[  245.183935] usb 2-3: new high-speed USB device number 17 using ehci-pci
[  245.379893] usb 2-3: device descriptor read/64, error -71
[  245.676884] usb 2-3: device descriptor read/64, error -71
[  245.879931] usb 2-3: new high-speed USB device number 18 using ehci-pci
[  246.341877] usb 2-3: device not accepting address 18, error -71
[  246.443893] usb 2-3: new high-speed USB device number 19 using ehci-pci
[  246.905868] usb 2-3: device not accepting address 19, error -71
[  246.905917] hub 2-0:1.0: unable to enumerate USB device on port 3
[  247.228003] usb 4-3: new full-speed USB device number 3 using ohci-pci
[  247.405980] usb 4-3: not running at top speed; connect to a high speed hub
[  247.420976] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[  247.420995] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  247.421005] usb 4-3: Product: Flash Disk      
[  247.421012] usb 4-3: Manufacturer: USB     
[  247.424113] usb-storage 4-3:1.0: USB Mass Storage device detected
[  247.424387] scsi9 : usb-storage 4-3:1.0
[  248.435048] scsi 9:0:0:0: Direct-Access     USB      Flash Disk       2.00 PQ: 0 ANSI: 2
[  248.436015] sd 9:0:0:0: Attached scsi generic sg5 type 0
[  248.468040] sd 9:0:0:0: [sde] Attached SCSI removable disk
[  258.219722] usb 4-3: USB disconnect, device number 3
...

Is that all communication should happen in the background without affecting the overall speed of system boot and reboot, well it is still the right question but for someone at linux-usb@ and linux-kernel@.

poma

[drago01]

On Sun, May 11, 2014 at 6:08 PM, poma  wrote:
> On 11.05.2014 08:37, Hans de Goede wrote:
> > Hi,
> >
> > On 05/10/2014 08:00 PM, drago01 wrote:
> > > On Sat, May 10, 2014 at 7:49 PM, Hans de Goede  wrote:
> > > > Hi,
> > > >
> > > > On 05/10/2014 05:13 PM, drago01 wrote:
> > > > > Hi,
> > > > >
> > > > > Startup finished in 8.394s (firmware) + 590ms (loader) + 918ms
> > > > > (kernel) + 19.389s (initrd) + 1.940s (userspace) = 31.234s
> > > > >
> > > > > ~19.4 seconds during initrd seems like a bit much ... looking at the
> > > > > log output I have noticed this:
> > > > >
> > > > > [    3.306309] usb 1-4: new full-speed USB device number 3 using xhci_hcd
> > > > > [    5.502178] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [    5.502190] usb 1-4: can't read configurations, error -71
> > > > > [    5.655591] usb 1-4: new full-speed USB device number 4 using xhci_hcd
> > > > > [    7.699049] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [    7.699060] usb 1-4: can't read configurations, error -71
> > > > > [    7.851791] usb 1-4: new full-speed USB device number 5 using xhci_hcd
> > > > > [    9.895842] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [    9.895854] usb 1-4: can't read configurations, error -71
> > > > > [    9.895997] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > > > [   10.048994] usb 1-5: new high-speed USB device number 6 using xhci_hcd
> > > > > [   10.363192] usb 1-5: New USB device found, idVendor=0bda, idProduct=58b1
> > > > > [   10.363202] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
> > > > > [   10.363208] usb 1-5: Product: FJ Camera
> > > > > [   10.363212] usb 1-5: Manufacturer: Generic
> > > > > [   10.363215] usb 1-5: SerialNumber: 200901010001
> > > > > [   10.519824] usb 1-7: new full-speed USB device number 7 using xhci_hcd
> > > > > [   10.684975] usb 1-7: New USB device found, idVendor=8087, idProduct=07dc
> > > > > [   10.684986] usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > > > [   10.942675] usb 1-4: new full-speed USB device number 8 using xhci_hcd
> > > > > [   13.139694] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [   13.139731] usb 1-4: can't read configurations, error -71
> > > > > [   13.292830] usb 1-4: new full-speed USB device number 9 using xhci_hcd
> > > > > [   15.489755] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [   15.489766] usb 1-4: can't read configurations, error -71
> > > > > [   15.642970] usb 1-4: new full-speed USB device number 10 using xhci_hcd
> > > > > [   17.687316] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [   17.687328] usb 1-4: can't read configurations, error -71
> > > > > [   17.840189] usb 1-4: new full-speed USB device number 11 using xhci_hcd
> > > > > [   19.884509] usb 1-4: unable to read config index 0 descriptor/start: -71
> > > > > [   19.884522] usb 1-4: can't read configurations, error -71
> > > > > [   19.884617] hub 1-0:1.0: unable to enumerate USB device on port 4
> > > > > [   19.919050] PM: Starting manual resume from disk
> > > > > [   19.940256] EXT4-fs (sda4): mounted filesystem with ordered data
> > > > > mode. Opts: (null)
> > > > > [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
> > > > >
> > > > > So  the questions are 1) what do those message actually mean? Seems
> > > > > like everything works anyway 2) why do those block the boot process
> > > > > ... its not like the root fs is on a usb driver or something.
> > > > >
> > > > > Kernel is 3.14.3-200.fc20.x86_64 (but does this not seem to matter it
> > > > > happens for pretty much every kernel for almost every but not all boot
> > > > > ups).
> > > > >
> > > > > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> > > > > Bus 001 Device 007: ID 8087:07dc Intel Corp.
> > > > > Bus 001 Device 006: ID 0bda:58b1 Realtek Semiconductor Corp.
> > > > > Bus 001 Device 012: ID 04f3:009b Elan Microelectronics Corp.
> > > > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > > >
> > > > > Any ideas where to investigate? Those error messages are really
> > > > > cryptic and do not tell me anything.
> > > >
> > > > -71 means EPROTO, note the device causing these issues is likely not
> > > > in your lsusb output since it fails to enumerate.
> > > >
> > > > linux/Documentation/usb/error-codes.txt says the following about EPROTO:
> > > >
> > > > -EPROTO (*, **)         a) bitstuff error
> > > >                         b) no response packet received within the
> > > >                            prescribed bus turn-around time
> > > >                         c) unknown USB error
> > > >
> > > > (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> > > > hardware problems such as bad devices (including firmware) or cables.
> > > >
> > > > (**) This is also one of several codes that different kinds of host
> > > > controller use to indicate a transfer has failed because of device
> > > > disconnect.  In the interval before the hub driver starts disconnect
> > > > processing, devices may receive such fault reports for every request.
> > > >
> > > > Your boot log indicated that eventually the device on Bus 1 port 4
> > > > does enumerate and is the "Elan Microelectronics Corp." device which
> > > > likely is a touchscreen or a touchpad (if this is a tablet device
> > > > with a keyboard dock). Possibly the cable from the touchpad / touchscreen
> > > > has a loose contact somewhere.
> > >
> > > I know that 1-4 is the touchscreen (its an ultrabook with a
> > > touchscreen) ... the touchscreen itself works just fine though.
> > > So if it takes more time / attempts to enumerate it and it works
> > > eventually anyway why do we block boot on it?
> >
> > That is a question for the systemd people / list.
>
> systemd-devel@, WTF!? :)
> systemd ain't kernel!
> > > The only effect of it is slow boot. Also not sure about the loose
> > > cable thing ... its a not so old laptop why would the cable be
> > > suddenly be lose?
> >
> > I had my laptop display die on me in the first few weeks, since it is
> > not old, chances are your laptop is still in the infant mortality part
> > of the bathtub curve: http://www.weibull.com/hotwire/issue21/ht21_1.gif
> >
> > And even if it is not hardware does fail. As
> > linux/Documentation/usb/error-codes.txt says, and so does my own
> > experience these type of errors typically come from hardware problems.
> >
> > Regards,
> >
> > Hans
>
> This is an example of a faulty wiring,
> ...
> [    1.034653] usb 2-3: new high-speed USB device number 2 using ehci-pci
> [    1.233643] usb 2-3: device descriptor read/64, error -71
> [    1.728627] usb 2-3: new high-speed USB device number 3 using ehci-pci
> [    2.116663] usb 2-3: new high-speed USB device number 4 using ehci-pci
> [    2.315730] usb 2-3: device descriptor read/64, error -71
> [    2.615645] usb 2-3: device descriptor read/64, error -71
> [    2.820711] usb 2-3: new high-speed USB device number 5 using ehci-pci
> [    3.019698] usb 2-3: device descriptor read/64, error -71
> [    3.506694] usb 2-3: new high-speed USB device number 6 using ehci-pci
> [    3.892698] usb 2-3: new high-speed USB device number 7 using ehci-pci
> [    4.278694] usb 2-3: new high-speed USB device number 8 using ehci-pci
> [    4.663694] usb 2-3: new high-speed USB device number 9 using ehci-pci
> [    4.861637] usb 2-3: device descriptor read/64, error -71
> [    5.347636] usb 2-3: new high-speed USB device number 10 using ehci-pci
> [    5.732694] usb 2-3: new high-speed USB device number 11 using ehci-pci
> [    5.930693] usb 2-3: device descriptor read/64, error -71
> [    6.416693] usb 2-3: new high-speed USB device number 12 using ehci-pci
> [    6.801692] usb 2-3: new high-speed USB device number 13 using ehci-pci
> [    7.186693] usb 2-3: new high-speed USB device number 14 using ehci-pci
> [    7.571692] usb 2-3: new high-speed USB device number 15 using ehci-pci
> [    7.956637] usb 2-3: new high-speed USB device number 16 using ehci-pci
> [    8.341692] usb 2-3: new high-speed USB device number 17 using ehci-pci
> [    8.726692] usb 2-3: new high-speed USB device number 18 using ehci-pci
> [    9.111690] usb 2-3: new high-speed USB device number 19 using ehci-pci
> [    9.496691] usb 2-3: new high-speed USB device number 20 using ehci-pci
> [    9.881695] usb 2-3: new high-speed USB device number 21 using ehci-pci
> [   10.266632] usb 2-3: new high-speed USB device number 22 using ehci-pci
> [   10.651690] usb 2-3: new high-speed USB device number 23 using ehci-pci
> [   10.849699] usb 2-3: device descriptor read/64, error -71
> [   11.148690] usb 2-3: device descriptor read/64, error -71
> [   11.352691] usb 2-3: new high-speed USB device number 24 using ehci-pci
> [   11.737690] usb 2-3: new high-speed USB device number 25 using ehci-pci
> [   12.122690] usb 2-3: new high-speed USB device number 26 using ehci-pci
> [   12.507691] usb 2-3: new high-speed USB device number 27 using ehci-pci
> [   12.892695] usb 2-3: new high-speed USB device number 28 using ehci-pci
> [   13.277631] usb 2-3: new high-speed USB device number 29 using ehci-pci
> [   13.661691] usb 2-3: new high-speed USB device number 30 using ehci-pci
> [   14.045692] usb 2-3: new high-speed USB device number 31 using ehci-pci
> [   14.429630] usb 2-3: new high-speed USB device number 32 using ehci-pci
> [   14.813702] usb 2-3: new high-speed USB device number 33 using ehci-pci
> [   15.197690] usb 2-3: new high-speed USB device number 34 using ehci-pci
> [   15.581630] usb 2-3: new high-speed USB device number 35 using ehci-pci
> [   15.965692] usb 2-3: new high-speed USB device number 36 using ehci-pci
> [   16.349688] usb 2-3: new high-speed USB device number 37 using ehci-pci
> [   16.733689] usb 2-3: new high-speed USB device number 38 using ehci-pci
> [   17.117633] usb 2-3: new high-speed USB device number 39 using ehci-pci
> [   17.501688] usb 2-3: new high-speed USB device number 40 using ehci-pci
> [   17.885640] usb 2-3: new high-speed USB device number 41 using ehci-pci
> [   18.269688] usb 2-3: new high-speed USB device number 42 using ehci-pci
> [   18.653687] usb 2-3: new high-speed USB device number 43 using ehci-pci
> [   19.037691] usb 2-3: new high-speed USB device number 44 using ehci-pci
> [   19.421689] usb 2-3: new high-speed USB device number 45 using ehci-pci
> [   19.805687] usb 2-3: new high-speed USB device number 46 using ehci-pci
> [   20.189629] usb 2-3: new high-speed USB device number 47 using ehci-pci
> [   20.573628] usb 2-3: new high-speed USB device number 48 using ehci-pci
> [   20.957691] usb 2-3: new high-speed USB device number 49 using ehci-pci
> [   21.341687] usb 2-3: new high-speed USB device number 50 using ehci-pci
> [   21.725687] usb 2-3: new high-speed USB device number 51 using ehci-pci
> [   21.922691] usb 2-3: device descriptor read/64, error -71
> [   22.407627] usb 2-3: new high-speed USB device number 52 using ehci-pci
> [   22.791686] usb 2-3: new high-speed USB device number 53 using ehci-pci
> [   23.175685] usb 2-3: new high-speed USB device number 54 using ehci-pci
> [   23.559686] usb 2-3: new high-speed USB device number 55 using ehci-pci
> [   23.943690] usb 2-3: new high-speed USB device number 56 using ehci-pci
> [   24.140626] usb 2-3: device descriptor read/64, error -71
> [   24.625626] usb 2-3: new high-speed USB device number 57 using ehci-pci
> [   25.009630] usb 2-3: new high-speed USB device number 58 using ehci-pci
> [   25.393685] usb 2-3: new high-speed USB device number 59 using ehci-pci
> [   25.777685] usb 2-3: new high-speed USB device number 60 using ehci-pci
> [   26.161685] usb 2-3: new high-speed USB device number 61 using ehci-pci
> [   26.545685] usb 2-3: new high-speed USB device number 62 using ehci-pci
> [   26.929688] usb 2-3: new high-speed USB device number 63 using ehci-pci
> [   27.126625] usb 2-3: device descriptor read/64, error -71
> [   27.424625] usb 2-3: device descriptor read/64, error -71
> [   27.627625] usb 2-3: new high-speed USB device number 64 using ehci-pci
> [   28.011634] usb 2-3: new high-speed USB device number 65 using ehci-pci
> [   28.395683] usb 2-3: new high-speed USB device number 66 using ehci-pci
> [   28.779683] usb 2-3: new high-speed USB device number 67 using ehci-pci
> [   28.976682] usb 2-3: device descriptor read/64, error -71
> [   29.461685] usb 2-3: new high-speed USB device number 68 using ehci-pci
> [   29.845692] usb 2-3: new high-speed USB device number 69 using ehci-pci
> [   30.304617] usb 4-3: new full-speed USB device number 2 using ohci-pci
> [   35.485636] usb 4-3: not running at top speed; connect to a high speed hub
> [   35.502401] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
> [   35.504571] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> [   35.506713] usb 4-3: Product: Flash Disk
> [   35.508857] usb 4-3: Manufacturer: USB
> [   36.585998] usb-storage 4-3:1.0: USB Mass Storage device detected
> [   36.586151] scsi8 : usb-storage 4-3:1.0
> [   36.586243] usbcore: registered new interface driver usb-storage
> [  189.039504] usb 4-3: USB disconnect, device number 2
> [  196.595288] usb 2-3: new high-speed USB device number 70 using ehci-pci
> [  196.792292] usb 2-3: device descriptor read/64, error -71
> [  197.090325] usb 2-3: device descriptor read/64, error -71
> [  197.293389] usb 2-3: new high-speed USB device number 71 using ehci-pci
> [  197.490306] usb 2-3: device descriptor read/64, error -71
> [  197.788337] usb 2-3: device descriptor read/64, error -71
> [  197.991368] usb 2-3: new high-speed USB device number 72 using ehci-pci
> [  198.455344] usb 2-3: device not accepting address 72, error -71
> [  198.557382] usb 2-3: new high-speed USB device number 73 using ehci-pci
> [  199.021366] usb 2-3: device not accepting address 73, error -71
> [  199.021456] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  199.259454] usb 2-3: new high-speed USB device number 74 using ehci-pci
> [  199.456434] usb 2-3: device descriptor read/64, error -71
> [  199.755478] usb 2-3: device descriptor read/64, error -71
> [  199.958446] usb 2-3: new high-speed USB device number 75 using ehci-pci
> [  200.155467] usb 2-3: device descriptor read/64, error -71
> [  200.454457] usb 2-3: device descriptor read/64, error -71
> [  200.657508] usb 2-3: new high-speed USB device number 76 using ehci-pci
> [  201.119465] usb 2-3: device not accepting address 76, error -71
> [  201.221519] usb 2-3: new high-speed USB device number 77 using ehci-pci
> [  201.683482] usb 2-3: device not accepting address 77, error -71
> [  201.683541] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  201.921590] usb 2-3: new high-speed USB device number 78 using ehci-pci
> [  202.117621] usb 2-3: device descriptor read/64, error -71
> [  202.414579] usb 2-3: device descriptor read/64, error -71
> [  202.617659] usb 2-3: new high-speed USB device number 79 using ehci-pci
> [  202.813557] usb 2-3: device descriptor read/64, error -71
> [  203.110611] usb 2-3: device descriptor read/64, error -71
> [  203.313623] usb 2-3: new high-speed USB device number 80 using ehci-pci
> [  203.775537] usb 2-3: device not accepting address 80, error -71
> [  203.877689] usb 2-3: new high-speed USB device number 81 using ehci-pci
> [  204.339613] usb 2-3: device not accepting address 81, error -71
> [  204.339695] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  204.578671] usb 2-3: new high-speed USB device number 82 using ehci-pci
> [  204.774653] usb 2-3: device descriptor read/64, error -71
> [  205.071673] usb 2-3: device descriptor read/64, error -71
> [  205.274641] usb 2-3: new high-speed USB device number 83 using ehci-pci
> [  205.470672] usb 2-3: device descriptor read/64, error -71
> [  205.767698] usb 2-3: device descriptor read/64, error -71
> [  205.970671] usb 2-3: new high-speed USB device number 84 using ehci-pci
> [  206.432703] usb 2-3: device not accepting address 84, error -71
> [  206.534753] usb 2-3: new high-speed USB device number 85 using ehci-pci
> [  206.996704] usb 2-3: device not accepting address 85, error -71
> [  206.996774] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  207.234764] usb 2-3: new high-speed USB device number 86 using ehci-pci
> [  207.430794] usb 2-3: device descriptor read/64, error -71
> [  207.727750] usb 2-3: device descriptor read/64, error -71
> [  207.930820] usb 2-3: new high-speed USB device number 87 using ehci-pci
> [  208.126828] usb 2-3: device descriptor read/64, error -71
> [  208.423833] usb 2-3: device descriptor read/64, error -71
> [  208.626865] usb 2-3: new high-speed USB device number 88 using ehci-pci
> [  209.088800] usb 2-3: device not accepting address 88, error -71
> [  209.190948] usb 2-3: new high-speed USB device number 89 using ehci-pci
> [  209.653917] usb 2-3: device not accepting address 89, error -71
> [  209.654013] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  209.892898] usb 2-3: new high-speed USB device number 90 using ehci-pci
> [  210.088899] usb 2-3: device descriptor read/64, error -71
> [  210.385882] usb 2-3: device descriptor read/64, error -71
> [  210.588859] usb 2-3: new high-speed USB device number 91 using ehci-pci
> [  210.784901] usb 2-3: device descriptor read/64, error -71
> [  211.081926] usb 2-3: device descriptor read/64, error -71
> [  211.284970] usb 2-3: new high-speed USB device number 92 using ehci-pci
> [  211.747895] usb 2-3: device not accepting address 92, error -71
> [  211.849983] usb 2-3: new high-speed USB device number 93 using ehci-pci
> [  212.313956] usb 2-3: device not accepting address 93, error -71
> [  212.314047] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  212.552948] usb 2-3: new high-speed USB device number 94 using ehci-pci
> [  212.750024] usb 2-3: device descriptor read/64, error -71
> [  213.048029] usb 2-3: device descriptor read/64, error -71
> [  213.251078] usb 2-3: new high-speed USB device number 95 using ehci-pci
> [  213.448054] usb 2-3: device descriptor read/64, error -71
> [  213.746097] usb 2-3: device descriptor read/64, error -71
> [  213.949111] usb 2-3: new high-speed USB device number 96 using ehci-pci
> [  214.413079] usb 2-3: device not accepting address 96, error -71
> [  214.515130] usb 2-3: new high-speed USB device number 97 using ehci-pci
> [  214.979170] usb 2-3: device not accepting address 97, error -71
> [  214.979270] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  215.217181] usb 2-3: new high-speed USB device number 98 using ehci-pci
> [  215.414186] usb 2-3: device descriptor read/64, error -71
> [  215.712193] usb 2-3: device descriptor read/64, error -71
> [  215.915213] usb 2-3: new high-speed USB device number 99 using ehci-pci
> [  216.113216] usb 2-3: device descriptor read/64, error -71
> [  216.411240] usb 2-3: device descriptor read/64, error -71
> [  216.615224] usb 2-3: new high-speed USB device number 100 using ehci-pci
> [  217.080226] usb 2-3: device not accepting address 100, error -71
> [  217.182349] usb 2-3: new high-speed USB device number 101 using ehci-pci
> [  217.646248] usb 2-3: device not accepting address 101, error -71
> [  217.646346] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  217.884377] usb 2-3: new high-speed USB device number 102 using ehci-pci
> [  218.081325] usb 2-3: device descriptor read/64, error -71
> [  218.379338] usb 2-3: device descriptor read/64, error -71
> [  218.582357] usb 2-3: new high-speed USB device number 103 using ehci-pci
> [  218.779362] usb 2-3: device descriptor read/64, error -71
> [  219.077363] usb 2-3: device descriptor read/64, error -71
> [  219.280375] usb 2-3: new high-speed USB device number 104 using ehci-pci
> [  219.744425] usb 2-3: device not accepting address 104, error -71
> [  219.846484] usb 2-3: new high-speed USB device number 105 using ehci-pci
> [  220.310372] usb 2-3: device not accepting address 105, error -71
> [  220.310433] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  220.548380] usb 2-3: new high-speed USB device number 106 using ehci-pci
> [  220.744445] usb 2-3: device descriptor read/64, error -71
> [  221.042434] usb 2-3: device descriptor read/64, error -71
> [  221.246486] usb 2-3: new high-speed USB device number 107 using ehci-pci
> [  221.442514] usb 2-3: device descriptor read/64, error -71
> [  221.739466] usb 2-3: device descriptor read/64, error -71
> [  221.942551] usb 2-3: new high-speed USB device number 108 using ehci-pci
> [  222.404487] usb 2-3: device not accepting address 108, error -71
> [  222.506635] usb 2-3: new high-speed USB device number 109 using ehci-pci
> [  222.968539] usb 2-3: device not accepting address 109, error -71
> [  222.968633] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  223.206608] usb 2-3: new high-speed USB device number 110 using ehci-pci
> [  223.402674] usb 2-3: device descriptor read/64, error -71
> [  223.699610] usb 2-3: device descriptor read/64, error -71
> [  223.902717] usb 2-3: new high-speed USB device number 111 using ehci-pci
> [  224.098646] usb 2-3: device descriptor read/64, error -71
> [  224.395646] usb 2-3: device descriptor read/64, error -71
> [  224.598657] usb 2-3: new high-speed USB device number 112 using ehci-pci
> [  225.060664] usb 2-3: device not accepting address 112, error -71
> [  225.162775] usb 2-3: new high-speed USB device number 113 using ehci-pci
> [  225.624674] usb 2-3: device not accepting address 113, error -71
> [  225.624750] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  225.862731] usb 2-3: new high-speed USB device number 114 using ehci-pci
> [  226.058715] usb 2-3: device descriptor read/64, error -71
> [  226.355780] usb 2-3: device descriptor read/64, error -71
> [  226.558788] usb 2-3: new high-speed USB device number 115 using ehci-pci
> [  226.754711] usb 2-3: device descriptor read/64, error -71
> [  227.051758] usb 2-3: device descriptor read/64, error -71
> [  227.254907] usb 2-3: new high-speed USB device number 116 using ehci-pci
> [  227.716804] usb 2-3: device not accepting address 116, error -71
> [  227.818848] usb 2-3: new high-speed USB device number 117 using ehci-pci
> [  228.280900] usb 2-3: device not accepting address 117, error -71
> [  228.281000] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  228.518967] usb 2-3: new high-speed USB device number 118 using ehci-pci
> [  228.715871] usb 2-3: device descriptor read/64, error -71
> [  229.012995] usb 2-3: device descriptor read/64, error -71
> [  229.215926] usb 2-3: new high-speed USB device number 119 using ehci-pci
> [  229.411928] usb 2-3: device descriptor read/64, error -71
> [  229.709972] usb 2-3: device descriptor read/64, error -71
> [  229.912978] usb 2-3: new high-speed USB device number 120 using ehci-pci
> [  230.375958] usb 2-3: device not accepting address 120, error -71
> [  230.478025] usb 2-3: new high-speed USB device number 121 using ehci-pci
> [  230.940980] usb 2-3: device not accepting address 121, error -71
> [  230.941060] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  231.179059] usb 2-3: new high-speed USB device number 122 using ehci-pci
> [  231.376061] usb 2-3: device descriptor read/64, error -71
> [  231.674086] usb 2-3: device descriptor read/64, error -71
> [  231.877075] usb 2-3: new high-speed USB device number 123 using ehci-pci
> [  232.074059] usb 2-3: device descriptor read/64, error -71
> [  232.372111] usb 2-3: device descriptor read/64, error -71
> [  232.575112] usb 2-3: new high-speed USB device number 124 using ehci-pci
> [  233.040175] usb 2-3: device not accepting address 124, error -71
> [  233.142206] usb 2-3: new high-speed USB device number 125 using ehci-pci
> [  233.607063] usb 2-3: device not accepting address 125, error -71
> [  233.607097] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  233.845277] usb 2-3: new high-speed USB device number 126 using ehci-pci
> [  234.042287] usb 2-3: device descriptor read/64, error -71
> [  234.340241] usb 2-3: device descriptor read/64, error -71
> [  234.543318] usb 2-3: new high-speed USB device number 127 using ehci-pci
> [  234.740264] usb 2-3: device descriptor read/64, error -71
> [  235.039347] usb 2-3: device descriptor read/64, error -71
> [  235.242355] usb 2-3: new high-speed USB device number 2 using ehci-pci
> [  235.706244] usb 2-3: device not accepting address 2, error -71
> [  235.808336] usb 2-3: new high-speed USB device number 3 using ehci-pci
> [  236.272281] usb 2-3: device not accepting address 3, error -71
> [  236.272366] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  236.510370] usb 2-3: new high-speed USB device number 4 using ehci-pci
> [  236.708352] usb 2-3: device descriptor read/64, error -71
> [  237.006461] usb 2-3: device descriptor read/64, error -71
> [  237.209415] usb 2-3: new high-speed USB device number 5 using ehci-pci
> [  237.406423] usb 2-3: device descriptor read/64, error -71
> [  237.704500] usb 2-3: device descriptor read/64, error -71
> [  237.907517] usb 2-3: new high-speed USB device number 6 using ehci-pci
> [  238.371365] usb 2-3: device not accepting address 6, error -71
> [  238.473496] usb 2-3: new high-speed USB device number 7 using ehci-pci
> [  238.935440] usb 2-3: device not accepting address 7, error -71
> [  238.935535] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  239.173538] usb 2-3: new high-speed USB device number 8 using ehci-pci
> [  239.369497] usb 2-3: device descriptor read/64, error -71
> [  239.666619] usb 2-3: device descriptor read/64, error -71
> [  239.869488] usb 2-3: new high-speed USB device number 9 using ehci-pci
> [  240.065586] usb 2-3: device descriptor read/64, error -71
> [  240.362568] usb 2-3: device descriptor read/64, error -71
> [  240.565612] usb 2-3: new high-speed USB device number 10 using ehci-pci
> [  241.027589] usb 2-3: device not accepting address 10, error -71
> [  241.129641] usb 2-3: new high-speed USB device number 11 using ehci-pci
> [  241.591625] usb 2-3: device not accepting address 11, error -71
> [  241.591723] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  241.830685] usb 2-3: new high-speed USB device number 12 using ehci-pci
> [  242.026756] usb 2-3: device descriptor read/64, error -71
> [  242.324714] usb 2-3: device descriptor read/64, error -71
> [  242.527792] usb 2-3: new high-speed USB device number 13 using ehci-pci
> [  242.723791] usb 2-3: device descriptor read/64, error -71
> [  243.020816] usb 2-3: device descriptor read/64, error -71
> [  243.223829] usb 2-3: new high-speed USB device number 14 using ehci-pci
> [  243.685792] usb 2-3: device not accepting address 14, error -71
> [  243.787878] usb 2-3: new high-speed USB device number 15 using ehci-pci
> [  244.249774] usb 2-3: device not accepting address 15, error -71
> [  244.249868] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  244.487858] usb 2-3: new high-speed USB device number 16 using ehci-pci
> [  244.683854] usb 2-3: device descriptor read/64, error -71
> [  244.980934] usb 2-3: device descriptor read/64, error -71
> [  245.183935] usb 2-3: new high-speed USB device number 17 using ehci-pci
> [  245.379893] usb 2-3: device descriptor read/64, error -71
> [  245.676884] usb 2-3: device descriptor read/64, error -71
> [  245.879931] usb 2-3: new high-speed USB device number 18 using ehci-pci
> [  246.341877] usb 2-3: device not accepting address 18, error -71
> [  246.443893] usb 2-3: new high-speed USB device number 19 using ehci-pci
> [  246.905868] usb 2-3: device not accepting address 19, error -71
> [  246.905917] hub 2-0:1.0: unable to enumerate USB device on port 3
> [  247.228003] usb 4-3: new full-speed USB device number 3 using ohci-pci
> [  247.405980] usb 4-3: not running at top speed; connect to a high speed hub
> [  247.420976] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
> [  247.420995] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> [  247.421005] usb 4-3: Product: Flash Disk
> [  247.421012] usb 4-3: Manufacturer: USB
> [  247.424113] usb-storage 4-3:1.0: USB Mass Storage device detected
> [  247.424387] scsi9 : usb-storage 4-3:1.0
> [  248.435048] scsi 9:0:0:0: Direct-Access     USB      Flash Disk       2.00 PQ: 0 ANSI: 2
> [  248.436015] sd 9:0:0:0: Attached scsi generic sg5 type 0
> [  248.468040] sd 9:0:0:0: [sde] Attached SCSI removable disk
> [  258.219722] usb 4-3: USB disconnect, device number 3
> ...
>
> Is that all communication should happen in the background without affecting the overall speed of system boot and reboot, well it is still the right question but for someone at linux-usb@ and linux-kernel@.

OK, added linux-usb to CC

[Alan Stern]

On Sun, 11 May 2014, drago01 wrote:
> > > > I know that 1-4 is the touchscreen (its an ultrabook with a
> > > > touchscreen) ... the touchscreen itself works just fine though.
> > > > So if it takes more time / attempts to enumerate it and it works
> > > > eventually anyway why do we block boot on it?
> > >
> > > That is a question for the systemd people / list.
> >
> > systemd-devel@, WTF!? :)
> > systemd ain't kernel!

As I understand it (and my understanding could easily be wrong), device
probing happens asynchronously during boot-up.  Then when the kernel is
about to mount the real root fs, it waits for all those async probes to
finish so that the real root device will have been found and is ready
for use.  Thus, a device that introduces a long delay during probing
can block booting, even if it doesn't contain the root filesystem.

It's a heavy-handed approach.  Maybe it would be possible to cut the 
wait short when the root device has been found, maybe not.  I'm not an 
expert on this.

Part of the problem is that the USB stack contains too many nested
retry loops with long delays in the device initialization pathway.  
It's not clear which of them should be removed, however.

Alan Stern

[Hans Petter Selasky]

On 05/11/14 19:07, Alan Stern wrote:
> On Sun, 11 May 2014, drago01 wrote:
> > > > > I know that 1-4 is the touchscreen (its an ultrabook with a
> > > > > touchscreen) ... the touchscreen itself works just fine though.
> > > > > So if it takes more time / attempts to enumerate it and it works
> > > > > eventually anyway why do we block boot on it?
> > > >
> > > > That is a question for the systemd people / list.
> > >
> > > systemd-devel@, WTF!? :)
> > > systemd ain't kernel!
>
> As I understand it (and my understanding could easily be wrong), device
> probing happens asynchronously during boot-up.  Then when the kernel is
> about to mount the real root fs, it waits for all those async probes to
> finish so that the real root device will have been found and is ready
> for use.  Thus, a device that introduces a long delay during probing
> can block booting, even if it doesn't contain the root filesystem.
>
> It's a heavy-handed approach.  Maybe it would be possible to cut the
> wait short when the root device has been found, maybe not.  I'm not an
> expert on this.
>
> Part of the problem is that the USB stack contains too many nested
> retry loops with long delays in the device initialization pathway.
> It's not clear which of them should be removed, however.

Hi,

echo "hw.usb.no_boot_wait=0" >> /boot/loader.conf

--HPS

[Hans Petter Selasky]

Hi,
> Hi,
>
> echo "hw.usb.no_boot_wait=0" >> /boot/loader.conf
>
> --HPS

Maybe not directly related to this list, but in FreeBSD we have a 
tunable to not wait for synchronous device probing at boot.

--HPS

[poma]

On 11.05.2014 19:17, Hans Petter Selasky wrote:
> Hi,
> > Hi,
> >
> > echo "hw.usb.no_boot_wait=0" >> /boot/loader.conf
> >
> > --HPS
>
> Maybe not directly related to this list, but in FreeBSD we have a 
> tunable to not wait for synchronous device probing at boot.
>
> --HPS

If there's somethin' strange in your neighborhood
Who ya gonna call
Ghostbusters!

I ain't afraid a no ghost
:)

Comes to mind 
"initial 64-byte descriptor request timeout"
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/driver...
https://www.kernel.org/doc/Documentation/kernel-parameters.txt
usbcore.initial_descriptor_timeout=
& Co.

poma

[poma]

...
> "initial 64-byte descriptor request timeout"
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/driver...
> https://www.kernel.org/doc/Documentation/kernel-parameters.txt
> usbcore.initial_descriptor_timeout=
> & Co.

I made several tests concerning the topic and incidentally found one bug. :)
Here they go ...

$ cat /sys/module/usbcore/parameters/old_scheme_first
N

...
[    0.000000] Kernel command line: ... usbcore.old_scheme_first=0 ...

<TEST-1>
...
[    1.023403] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.406396] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    1.583398] usb 2-3: device descriptor read/64, error -71
[    1.882430] usb 2-3: device descriptor read/64, error -71
[    2.086434] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.284465] usb 2-3: device descriptor read/64, error -71
[    2.583467] usb 2-3: device descriptor read/64, error -71
[    2.788455] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.252449] usb 2-3: device not accepting address 5, error -71
[    3.356458] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.821385] usb 2-3: device not accepting address 6, error -71
[    4.143409] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    9.322407] usb 4-3: not running at top speed; connect to a high speed hub
[    9.338413] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    9.338414] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    9.338415] usb 4-3: Product: Flash Disk      
[    9.338416] usb 4-3: Manufacturer: USB     
[   10.147223] usb-storage 4-3:1.0: USB Mass Storage device detected
[   10.147741] scsi8 : usb-storage 4-3:1.0
[   10.147815] usbcore: registered new interface driver usb-storage

<TEST-2>
...
[    1.033385] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.234421] usb 2-3: device descriptor read/64, error -71
[    1.723407] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    1.926388] usb 2-3: device descriptor read/64, error -71
[    2.225435] usb 2-3: device descriptor read/64, error -71
[    2.430495] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.629410] usb 2-3: device descriptor read/64, error -71
[    3.116409] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.315406] usb 2-3: device descriptor read/64, error -71
[    3.614406] usb 2-3: device descriptor read/64, error -71
[    3.819415] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    4.017405] usb 2-3: device descriptor read/64, error -71
[    4.315405] usb 2-3: device descriptor read/64, error -71
[    4.519406] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    4.984468] usb 2-3: device not accepting address 7, error -71
[    5.087468] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    5.551463] usb 2-3: device not accepting address 8, error -71
[    5.876416] usb 4-3: new full-speed USB device number 2 using ohci-pci
[   11.058447] usb 4-3: not running at top speed; connect to a high speed hub
[   11.074418] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[   11.076701] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   11.078985] usb 4-3: Product: Flash Disk      
[   11.081261] usb 4-3: Manufacturer: USB     
[   11.578024] usb-storage 4-3:1.0: USB Mass Storage device detected
[   11.578275] scsi8 : usb-storage 4-3:1.0
[   11.578783] usbcore: registered new interface driver usb-storage

<TEST-3>
...
[    1.027406] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.229405] usb 2-3: device descriptor read/64, error -71
[    1.716435] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    1.915403] usb 2-3: device descriptor read/64, error -71
[    2.214431] usb 2-3: device descriptor read/64, error -71
[    2.419422] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.617398] usb 2-3: device descriptor read/64, error -71
[    2.916407] usb 2-3: device descriptor read/64, error -71
[    3.120398] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.585454] usb 2-3: device not accepting address 5, error -71
[    3.689457] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    4.153394] usb 2-3: device not accepting address 6, error -71
[    4.475391] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    4.655438] usb 4-3: not running at top speed; connect to a high speed hub
[    4.671402] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    4.673556] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    4.675696] usb 4-3: Product: Flash Disk      
[    4.677858] usb 4-3: Manufacturer: USB     
[   10.828081] usb-storage 4-3:1.0: USB Mass Storage device detected
[   10.829432] scsi8 : usb-storage 4-3:1.0
[   10.829503] usbcore: registered new interface driver usb-storage

<TEST-4>
...
[    1.022389] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.413397] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    1.612415] usb 2-3: device descriptor read/64, error -71
[    1.913368] usb 2-3: device descriptor read/64, error -71
[    2.118406] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.317478] usb 2-3: device descriptor read/64, error -71
[    2.617394] usb 2-3: device descriptor read/64, error -71
[    2.822461] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.288438] usb 2-3: device not accepting address 5, error -71
[    3.392445] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.858434] usb 2-3: device not accepting address 6, error -71
[    4.184387] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    4.364424] usb 4-3: not running at top speed; connect to a high speed hub
[    4.380425] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    4.382573] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    4.384752] usb 4-3: Product: Flash Disk      
[    4.386883] usb 4-3: Manufacturer: USB     
[   10.082785] usb-storage 4-3:1.0: USB Mass Storage device detected
[   10.085269] scsi8 : usb-storage 4-3:1.0
[   10.087663] usbcore: registered new interface driver usb-storage

~~~~~~~~~~~~~~

$ cat /sys/module/usbcore/parameters/old_scheme_first
N

$ cat /sys/module/usbcore/parameters/initial_descriptor_timeout
0

...
[    0.000000] Kernel command line: ... usbcore.old_scheme_first=0 usbcore.initial_descriptor_timeout=0 ...

<TEST-5>
...
[    1.023371] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.219390] usb 2-3: device descriptor read/64, error -71
[    1.743371] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    1.929426] usb 4-3: not running at top speed; connect to a high speed hub
[    1.944420] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    1.946270] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    1.948130] usb 4-3: Product: Flash Disk      
[    1.949938] usb 4-3: Manufacturer: USB     
[    1.956081] usb-storage 4-3:1.0: USB Mass Storage device detected
[    1.958080] scsi8 : usb-storage 4-3:1.0
[    1.960050] usbcore: registered new interface driver usb-storage

<TEST-6>
...
[    1.023409] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.221415] usb 2-3: device descriptor read/64, error -71
[    1.520411] usb 2-3: device descriptor read/64, error -71
[    1.722748] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    1.921446] usb 2-3: device descriptor read/64, error -71
[    2.220451] usb 2-3: device descriptor read/64, error -71
[    2.425437] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.890399] usb 2-3: device not accepting address 4, error -71
[    2.994405] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.459393] usb 2-3: device not accepting address 5, error -71
[    3.738420] usb 4-3: new full-speed USB device number 2 using ohci-pci

~~~~~~~~~~~~~~
~~~~~~~~~~~~~~

$ cat /sys/module/usbcore/parameters/old_scheme_first
Y

...
[    0.000000] Kernel command line: ... usbcore.old_scheme_first=1 ...

<TEST-1>
...
[    1.029405] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.493373] usb 2-3: device not accepting address 2, error -71
[    1.595426] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.062379] usb 2-3: device not accepting address 3, error -71
[    2.166416] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.551476] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.015462] usb 2-3: device not accepting address 5, error -71
[    3.119466] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.583401] usb 2-3: device not accepting address 6, error -71
[    3.686401] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    3.884401] usb 2-3: device descriptor read/64, error -71
[    4.182403] usb 2-3: device descriptor read/64, error -71
[    4.386401] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.584403] usb 2-3: device descriptor read/64, error -71
[    4.882391] usb 2-3: device descriptor read/64, error -71
[    5.304396] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    5.328412] usb 4-3: not running at top speed; connect to a high speed hub
[    5.344414] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    5.346480] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    5.348504] usb 4-3: Product: Flash Disk      
[    5.350441] usb 4-3: Manufacturer: USB     
[    5.357103] usb-storage 4-3:1.0: USB Mass Storage device detected
[    5.359106] scsi8 : usb-storage 4-3:1.0
[    5.361119] usbcore: registered new interface driver usb-storage

<TEST-2>
...
[    1.023779] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.511660] usb 2-3: device not accepting address 2, error -71
[    1.615216] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.080187] usb 2-3: device not accepting address 3, error -71
[    2.184218] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.569262] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.033202] usb 2-3: device not accepting address 5, error -71
[    3.137255] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.601184] usb 2-3: device not accepting address 6, error -71
[    3.705192] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    3.903206] usb 2-3: device descriptor read/64, error -71
[    4.201191] usb 2-3: device descriptor read/64, error -71
[    4.405190] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.603189] usb 2-3: device descriptor read/64, error -71
[    4.901211] usb 2-3: device descriptor read/64, error -71
[    5.216253] usb 2-3: new high-speed USB device number 9 using ehci-pci
[    5.680248] usb 2-3: device not accepting address 9, error -71
[    5.784250] usb 2-3: new high-speed USB device number 10 using ehci-pci
[    6.248247] usb 2-3: device not accepting address 10, error -71
[    6.352249] usb 2-3: new high-speed USB device number 11 using ehci-pci
[    6.550249] usb 2-3: device descriptor read/64, error -71
[    6.849279] usb 2-3: device descriptor read/64, error -71
[    7.054252] usb 2-3: new high-speed USB device number 12 using ehci-pci
[    7.252250] usb 2-3: device descriptor read/64, error -71
[    7.551248] usb 2-3: device descriptor read/64, error -71
[    7.974182] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    7.997197] usb 4-3: not running at top speed; connect to a high speed hub
[    8.012200] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    8.014106] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    8.016052] usb 4-3: Product: Flash Disk      
[    8.017963] usb 4-3: Manufacturer: USB     
[    8.023856] usb-storage 4-3:1.0: USB Mass Storage device detected
[    8.025932] scsi8 : usb-storage 4-3:1.0
[    8.027931] usbcore: registered new interface driver usb-storage

<TEST-3>
...
[    1.024433] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.487397] usb 2-3: device not accepting address 2, error -71
[    1.591455] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.058425] usb 2-3: device not accepting address 3, error -71
[    2.162461] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.547502] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.011483] usb 2-3: device not accepting address 5, error -71
[    3.115489] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.579487] usb 2-3: device not accepting address 6, error -71
[    3.683490] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    4.068494] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.532430] usb 2-3: device not accepting address 8, error -71
[    4.635433] usb 2-3: new high-speed USB device number 9 using ehci-pci
[    5.099425] usb 2-3: device not accepting address 9, error -71
[    5.202490] usb 2-3: new high-speed USB device number 10 using ehci-pci
[    5.400489] usb 2-3: device descriptor read/64, error -71
[    5.885494] usb 2-3: new high-speed USB device number 11 using ehci-pci
[    6.349427] usb 2-3: device not accepting address 11, error -71
[    6.453430] usb 2-3: new high-speed USB device number 12 using ehci-pci
[    6.917491] usb 2-3: device not accepting address 12, error -71
[    7.021492] usb 2-3: new high-speed USB device number 13 using ehci-pci
[    7.220490] usb 2-3: device descriptor read/64, error -71
[    7.519489] usb 2-3: device descriptor read/64, error -71
[    7.724490] usb 2-3: new high-speed USB device number 14 using ehci-pci
[    8.110490] usb 2-3: new high-speed USB device number 15 using ehci-pci
[    8.574487] usb 2-3: device not accepting address 15, error -71
[    8.678490] usb 2-3: new high-speed USB device number 16 using ehci-pci
[    9.142484] usb 2-3: device not accepting address 16, error -71
[    9.246433] usb 2-3: new high-speed USB device number 17 using ehci-pci
[    9.444430] usb 2-3: device descriptor read/64, error -71
[    9.743489] usb 2-3: device descriptor read/64, error -71
[    9.948405] usb 2-3: new high-speed USB device number 18 using ehci-pci
[   10.146490] usb 2-3: device descriptor read/64, error -71
[   10.445429] usb 2-3: device descriptor read/64, error -71
[   10.760430] usb 2-3: new high-speed USB device number 19 using ehci-pci
[   11.224486] usb 2-3: device not accepting address 19, error -71
[   11.327489] usb 2-3: new high-speed USB device number 20 using ehci-pci
[   11.791486] usb 2-3: device not accepting address 20, error -71
[   11.894494] usb 2-3: new high-speed USB device number 21 using ehci-pci
[   12.092490] usb 2-3: device descriptor read/64, error -71
[   12.390489] usb 2-3: device descriptor read/64, error -71
[   12.594428] usb 2-3: new high-speed USB device number 22 using ehci-pci
[   12.792489] usb 2-3: device descriptor read/64, error -71
[   13.090489] usb 2-3: device descriptor read/64, error -71
[   13.405490] usb 2-3: new high-speed USB device number 23 using ehci-pci
[   13.869431] usb 2-3: device not accepting address 23, error -71
[   13.972432] usb 2-3: new high-speed USB device number 24 using ehci-pci
[   14.436487] usb 2-3: device not accepting address 24, error -71
[   14.539489] usb 2-3: new high-speed USB device number 25 using ehci-pci
[   14.737490] usb 2-3: device descriptor read/64, error -71
[   15.035428] usb 2-3: device descriptor read/64, error -71
[   15.239489] usb 2-3: new high-speed USB device number 26 using ehci-pci
[   15.437489] usb 2-3: device descriptor read/64, error -71
[   15.735489] usb 2-3: device descriptor read/64, error -71
[   16.050434] usb 2-3: new high-speed USB device number 27 using ehci-pci
[   16.514487] usb 2-3: device not accepting address 27, error -71
[   16.617489] usb 2-3: new high-speed USB device number 28 using ehci-pci
[   17.081424] usb 2-3: device not accepting address 28, error -71
[   17.184430] usb 2-3: new high-speed USB device number 29 using ehci-pci
[   17.382430] usb 2-3: device descriptor read/64, error -71
[   17.680429] usb 2-3: device descriptor read/64, error -71
[   17.884434] usb 2-3: new high-speed USB device number 30 using ehci-pci
[   18.082430] usb 2-3: device descriptor read/64, error -71
[   18.380429] usb 2-3: device descriptor read/64, error -71
[   18.695490] usb 2-3: new high-speed USB device number 31 using ehci-pci
[   19.159483] usb 2-3: device not accepting address 31, error -71
[   19.262490] usb 2-3: new high-speed USB device number 32 using ehci-pci
[   19.726487] usb 2-3: device not accepting address 32, error -71
[   19.829500] usb 2-3: new high-speed USB device number 33 using ehci-pci
[   20.027490] usb 2-3: device descriptor read/64, error -71
[   20.325490] usb 2-3: device descriptor read/64, error -71
[   20.529489] usb 2-3: new high-speed USB device number 34 using ehci-pci
[   20.727490] usb 2-3: device descriptor read/64, error -71
[   21.025490] usb 2-3: device descriptor read/64, error -71
[   21.340490] usb 2-3: new high-speed USB device number 35 using ehci-pci
[   21.804487] usb 2-3: device not accepting address 35, error -71
[   21.907490] usb 2-3: new high-speed USB device number 36 using ehci-pci
[   22.371487] usb 2-3: device not accepting address 36, error -71
[   22.474489] usb 2-3: new high-speed USB device number 37 using ehci-pci
[   22.672489] usb 2-3: device descriptor read/64, error -71
[   22.970495] usb 2-3: device descriptor read/64, error -71
[   23.174439] usb 2-3: new high-speed USB device number 38 using ehci-pci
[   23.372489] usb 2-3: device descriptor read/64, error -71
[   23.670489] usb 2-3: device descriptor read/64, error -71
[   23.985494] usb 2-3: new high-speed USB device number 39 using ehci-pci
[   24.449426] usb 2-3: device not accepting address 39, error -71
[   24.552487] usb 2-3: new high-speed USB device number 40 using ehci-pci
[   25.016490] usb 2-3: device not accepting address 40, error -71
[   25.119430] usb 2-3: new high-speed USB device number 41 using ehci-pci
[   25.317489] usb 2-3: device descriptor read/64, error -71
[   25.615488] usb 2-3: device descriptor read/64, error -71
[   25.819499] usb 2-3: new high-speed USB device number 42 using ehci-pci
[   26.017488] usb 2-3: device descriptor read/64, error -71
[   26.315488] usb 2-3: device descriptor read/64, error -71
[   26.630488] usb 2-3: new high-speed USB device number 43 using ehci-pci
[   27.094423] usb 2-3: device not accepting address 43, error -71
[   27.197431] usb 2-3: new high-speed USB device number 44 using ehci-pci
[   27.661487] usb 2-3: device not accepting address 44, error -71
[   27.764487] usb 2-3: new high-speed USB device number 45 using ehci-pci
[   27.962493] usb 2-3: device descriptor read/64, error -71
[   28.260488] usb 2-3: device descriptor read/64, error -71
[   28.464489] usb 2-3: new high-speed USB device number 46 using ehci-pci
[   28.849439] usb 2-3: new high-speed USB device number 47 using ehci-pci
[   29.313426] usb 2-3: device not accepting address 47, error -71
[   29.416429] usb 2-3: new high-speed USB device number 48 using ehci-pci
[   29.880491] usb 2-3: device not accepting address 48, error -71
[   29.983493] usb 2-3: new high-speed USB device number 49 using ehci-pci
[   30.181487] usb 2-3: device descriptor read/64, error -71
[   30.479487] usb 2-3: device descriptor read/64, error -71
[   30.683488] usb 2-3: new high-speed USB device number 50 using ehci-pci
[   30.881493] usb 2-3: device descriptor read/64, error -71
[   31.179489] usb 2-3: device descriptor read/64, error -71
[   31.494488] usb 2-3: new high-speed USB device number 51 using ehci-pci
[   31.958490] usb 2-3: device not accepting address 51, error -71
[   32.061491] usb 2-3: new high-speed USB device number 52 using ehci-pci
[   32.525483] usb 2-3: device not accepting address 52, error -71
[   32.629509] usb 2-3: new high-speed USB device number 53 using ehci-pci
[   32.827519] usb 2-3: device descriptor read/64, error -71
[   33.126436] usb 2-3: device descriptor read/64, error -71
[   33.330496] usb 2-3: new high-speed USB device number 54 using ehci-pci
[   33.715491] usb 2-3: new high-speed USB device number 55 using ehci-pci
[   34.179487] usb 2-3: device not accepting address 55, error -71
[   34.282492] usb 2-3: new high-speed USB device number 56 using ehci-pci
[   34.746487] usb 2-3: device not accepting address 56, error -71
[   34.849443] usb 2-3: new high-speed USB device number 57 using ehci-pci
[   35.047431] usb 2-3: device descriptor read/64, error -71
[   35.345490] usb 2-3: device descriptor read/64, error -71
[   35.549491] usb 2-3: new high-speed USB device number 58 using ehci-pci
[   35.747490] usb 2-3: device descriptor read/64, error -71
[   36.045430] usb 2-3: device descriptor read/64, error -71
[   36.360490] usb 2-3: new high-speed USB device number 59 using ehci-pci
[   36.824506] usb 2-3: device not accepting address 59, error -71
[   36.928494] usb 2-3: new high-speed USB device number 60 using ehci-pci
[   37.392487] usb 2-3: device not accepting address 60, error -71
[   37.495491] usb 2-3: new high-speed USB device number 61 using ehci-pci
[   37.693490] usb 2-3: device descriptor read/64, error -71
[   37.991509] usb 2-3: device descriptor read/64, error -71
[   38.195493] usb 2-3: new high-speed USB device number 62 using ehci-pci
[   38.393488] usb 2-3: device descriptor read/64, error -71
[   38.691487] usb 2-3: device descriptor read/64, error -71
[   39.006432] usb 2-3: new high-speed USB device number 63 using ehci-pci
[   39.470486] usb 2-3: device not accepting address 63, error -71
[   39.573488] usb 2-3: new high-speed USB device number 64 using ehci-pci
[   40.037514] usb 2-3: device not accepting address 64, error -71
[   40.140431] usb 2-3: new high-speed USB device number 65 using ehci-pci
[   40.338487] usb 2-3: device descriptor read/64, error -71
[   40.636488] usb 2-3: device descriptor read/64, error -71
[   40.840514] usb 2-3: new high-speed USB device number 66 using ehci-pci
[   41.038487] usb 2-3: device descriptor read/64, error -71
[   41.336488] usb 2-3: device descriptor read/64, error -71
[   41.651428] usb 2-3: new high-speed USB device number 67 using ehci-pci
[   42.115485] usb 2-3: device not accepting address 67, error -71
[   42.218487] usb 2-3: new high-speed USB device number 68 using ehci-pci
[   42.682483] usb 2-3: device not accepting address 68, error -71
[   42.785487] usb 2-3: new high-speed USB device number 69 using ehci-pci
[   42.983513] usb 2-3: device descriptor read/64, error -71
[   43.468487] usb 2-3: new high-speed USB device number 70 using ehci-pci
[   43.932510] usb 2-3: device not accepting address 70, error -71
[   44.036490] usb 2-3: new high-speed USB device number 71 using ehci-pci
[   44.500485] usb 2-3: device not accepting address 71, error -71
[   44.604427] usb 2-3: new high-speed USB device number 72 using ehci-pci
[   44.802487] usb 2-3: device descriptor read/64, error -71
[   45.101427] usb 2-3: device descriptor read/64, error -71
[   45.305487] usb 2-3: new high-speed USB device number 73 using ehci-pci
[   45.503486] usb 2-3: device descriptor read/64, error -71
[   45.801487] usb 2-3: device descriptor read/64, error -71
[   46.116489] usb 2-3: new high-speed USB device number 74 using ehci-pci
[   46.580486] usb 2-3: device not accepting address 74, error -71
[   46.684488] usb 2-3: new high-speed USB device number 75 using ehci-pci
[   47.148485] usb 2-3: device not accepting address 75, error -71
[   47.252428] usb 2-3: new high-speed USB device number 76 using ehci-pci
[   47.450427] usb 2-3: device descriptor read/64, error -71
[   47.748487] usb 2-3: device descriptor read/64, error -71
[   47.952492] usb 2-3: new high-speed USB device number 77 using ehci-pci
[   48.150431] usb 2-3: device descriptor read/64, error -71
[   48.448428] usb 2-3: device descriptor read/64, error -71
[   48.763487] usb 2-3: new high-speed USB device number 78 using ehci-pci
[   49.227485] usb 2-3: device not accepting address 78, error -71
[   49.331488] usb 2-3: new high-speed USB device number 79 using ehci-pci
[   49.795485] usb 2-3: device not accepting address 79, error -71
[   49.899494] usb 2-3: new high-speed USB device number 80 using ehci-pci
[   50.097427] usb 2-3: device descriptor read/64, error -71
[   50.395487] usb 2-3: device descriptor read/64, error -71
[   50.599427] usb 2-3: new high-speed USB device number 81 using ehci-pci
[   50.797487] usb 2-3: device descriptor read/64, error -71
[   51.095425] usb 2-3: device descriptor read/64, error -71
[   51.410488] usb 2-3: new high-speed USB device number 82 using ehci-pci
[   51.874509] usb 2-3: device not accepting address 82, error -71
[   51.977490] usb 2-3: new high-speed USB device number 83 using ehci-pci
[   52.441489] usb 2-3: device not accepting address 83, error -71
[   52.544488] usb 2-3: new high-speed USB device number 84 using ehci-pci
[   52.742487] usb 2-3: device descriptor read/64, error -71
[   53.040488] usb 2-3: device descriptor read/64, error -71
[   53.244428] usb 2-3: new high-speed USB device number 85 using ehci-pci
[   53.442428] usb 2-3: device descriptor read/64, error -71
[   53.740487] usb 2-3: device descriptor read/64, error -71
[   54.055491] usb 2-3: new high-speed USB device number 86 using ehci-pci
[   54.519486] usb 2-3: device not accepting address 86, error -71
[   54.622487] usb 2-3: new high-speed USB device number 87 using ehci-pci
[   55.086486] usb 2-3: device not accepting address 87, error -71
[   55.189489] usb 2-3: new high-speed USB device number 88 using ehci-pci
[   55.387428] usb 2-3: device descriptor read/64, error -71
[   55.685487] usb 2-3: device descriptor read/64, error -71
[   55.889494] usb 2-3: new high-speed USB device number 89 using ehci-pci
[   56.087487] usb 2-3: device descriptor read/64, error -71
[   56.385487] usb 2-3: device descriptor read/64, error -71
[   56.700488] usb 2-3: new high-speed USB device number 90 using ehci-pci
[   57.164484] usb 2-3: device not accepting address 90, error -71
[   57.267487] usb 2-3: new high-speed USB device number 91 using ehci-pci
[   57.731486] usb 2-3: device not accepting address 91, error -71
[   57.834503] usb 2-3: new high-speed USB device number 92 using ehci-pci
[   58.032488] usb 2-3: device descriptor read/64, error -71
[   58.330488] usb 2-3: device descriptor read/64, error -71
[   58.534487] usb 2-3: new high-speed USB device number 93 using ehci-pci
[   58.732488] usb 2-3: device descriptor read/64, error -71
[   59.030487] usb 2-3: device descriptor read/64, error -71
[   59.345487] usb 2-3: new high-speed USB device number 94 using ehci-pci
[   59.809485] usb 2-3: device not accepting address 94, error -71
[   59.912495] usb 2-3: new high-speed USB device number 95 using ehci-pci
[   60.376485] usb 2-3: device not accepting address 95, error -71
[   60.479488] usb 2-3: new high-speed USB device number 96 using ehci-pci
[   60.677487] usb 2-3: device descriptor read/64, error -71
[   60.975510] usb 2-3: device descriptor read/64, error -71
[   61.179492] usb 2-3: new high-speed USB device number 97 using ehci-pci
[   61.377487] usb 2-3: device descriptor read/64, error -71
[   61.675487] usb 2-3: device descriptor read/64, error -71
[   61.990491] usb 2-3: new high-speed USB device number 98 using ehci-pci
[   62.454426] usb 2-3: device not accepting address 98, error -71
[   62.557429] usb 2-3: new high-speed USB device number 99 using ehci-pci
[   63.021389] usb 2-3: device not accepting address 99, error -71
[   63.124442] usb 2-3: new high-speed USB device number 100 using ehci-pci
[   63.322436] usb 2-3: device descriptor read/64, error -71
[   63.812447] usb 2-3: new high-speed USB device number 101 using ehci-pci
[   64.277386] usb 2-3: device not accepting address 101, error -71
[   64.381450] usb 2-3: new high-speed USB device number 102 using ehci-pci
[   64.846392] usb 2-3: device not accepting address 102, error -71
[   64.950413] usb 2-3: new high-speed USB device number 103 using ehci-pci
[   65.336443] usb 2-3: new high-speed USB device number 104 using ehci-pci
[   65.801433] usb 2-3: device not accepting address 104, error -71
[   65.905441] usb 2-3: new high-speed USB device number 105 using ehci-pci
[   66.370393] usb 2-3: device not accepting address 105, error -71
[   66.473452] usb 2-3: new high-speed USB device number 106 using ehci-pci
[   66.671442] usb 2-3: device descriptor read/64, error -71
[   66.969454] usb 2-3: device descriptor read/64, error -71
[   67.173448] usb 2-3: new high-speed USB device number 107 using ehci-pci
[   67.371427] usb 2-3: device descriptor read/64, error -71
[   67.670453] usb 2-3: device descriptor read/64, error -71
[   68.095468] usb 4-3: new full-speed USB device number 2 using ohci-pci
[   68.121460] usb 4-3: not running at top speed; connect to a high speed hub
[   68.137466] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[   68.142351] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   68.147203] usb 4-3: Product: Flash Disk      
[   68.152046] usb 4-3: Manufacturer: USB     
[   68.961468] usb-storage 4-3:1.0: USB Mass Storage device detected
[   68.961571] scsi8 : usb-storage 4-3:1.0
[   68.961654] usbcore: registered new interface driver usb-storage

<TEST-4>
...
[    1.033684] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.499601] usb 2-3: device not accepting address 2, error -71
[    1.602668] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.068641] usb 2-3: device not accepting address 3, error -71
[    2.172667] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.557715] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.021635] usb 2-3: device not accepting address 5, error -71
[    3.125700] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.589698] usb 2-3: device not accepting address 6, error -71
[    3.693700] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    3.891738] usb 2-3: device descriptor read/64, error -71
[    4.190699] usb 2-3: device descriptor read/64, error -71
[    4.394701] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.592699] usb 2-3: device descriptor read/64, error -71
[    4.890730] usb 2-3: device descriptor read/64, error -71
[    5.312652] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    5.336649] usb 4-3: not running at top speed; connect to a high speed hub
[    5.352651] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    5.354759] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    5.356806] usb 4-3: Product: Flash Disk      
[    5.358784] usb 4-3: Manufacturer: USB     
[    5.365300] usb-storage 4-3:1.0: USB Mass Storage device detected
[    5.367324] scsi8 : usb-storage 4-3:1.0
[    5.369328] usbcore: registered new interface driver usb-storage

~~~~~~~~~~~~~~

$ cat /sys/module/usbcore/parameters/old_scheme_first
Y

$ cat /sys/module/usbcore/parameters/initial_descriptor_timeout
0

...
[    0.000000] Kernel command line: ... usbcore.old_scheme_first=1 usbcore.initial_descriptor_timeout=0 ...

<TEST-5>
...
[    1.030395] usb 2-3: new high-speed USB device number 2 using ehci-pci
[    1.492398] usb 2-3: device not accepting address 2, error -71
[    1.594621] usb 2-3: new high-speed USB device number 3 using ehci-pci
[    2.061409] usb 2-3: device not accepting address 3, error -71
[    2.165425] usb 2-3: new high-speed USB device number 4 using ehci-pci
[    2.364408] usb 2-3: device descriptor read/64, error -71
[    2.850470] usb 2-3: new high-speed USB device number 5 using ehci-pci
[    3.315396] usb 2-3: device not accepting address 5, error -71
[    3.419402] usb 2-3: new high-speed USB device number 6 using ehci-pci
[    3.884411] usb 2-3: device not accepting address 6, error -71
[    3.988403] usb 2-3: new high-speed USB device number 7 using ehci-pci
[    4.187390] usb 2-3: device descriptor read/64, error -71
[    4.486361] usb 2-3: device descriptor read/64, error -71
[    4.691362] usb 2-3: new high-speed USB device number 8 using ehci-pci
[    4.890362] usb 2-3: device descriptor read/64, error -71
[    5.376389] usb 2-3: new high-speed USB device number 9 using ehci-pci
[    5.841462] usb 2-3: device not accepting address 9, error -71
[    5.945463] usb 2-3: new high-speed USB device number 10 using ehci-pci
[    6.410382] usb 2-3: device not accepting address 10, error -71
[    6.514399] usb 2-3: new high-speed USB device number 11 using ehci-pci
[    6.713375] usb 2-3: device descriptor read/64, error -71
[    7.012404] usb 2-3: device descriptor read/64, error -71
[    7.217399] usb 2-3: new high-speed USB device number 12 using ehci-pci
[    7.603394] usb 2-3: new high-speed USB device number 13 using ehci-pci
[    8.068395] usb 2-3: device not accepting address 13, error -71
[    8.172371] usb 2-3: new high-speed USB device number 14 using ehci-pci
[    8.637382] usb 2-3: device not accepting address 14, error -71
[    8.741361] usb 2-3: new high-speed USB device number 15 using ehci-pci
[    9.202394] usb 4-3: new full-speed USB device number 2 using ohci-pci
[    9.226427] usb 4-3: not running at top speed; connect to a high speed hub
[    9.241429] usb 4-3: New USB device found, idVendor=0ea0, idProduct=2168
[    9.243364] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    9.245300] usb 4-3: Product: Flash Disk      
[    9.247195] usb 4-3: Manufacturer: USB     
[    9.253073] usb-storage 4-3:1.0: USB Mass Storage device detected
[    9.255097] scsi8 : usb-storage 4-3:1.0
[    9.257061] usbcore: registered new interface driver usb-storage

~~~~~~~~~~~~~~
~~~~~~~~~~~~~~

https://bugzilla.redhat.com/show_bug.cgi?id=1096786
Unplug the device without unmounting,

...
usb 2-1: USB disconnect, device number 2
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4692 at fs/sysfs/group.c:216 sysfs_remove_group+0x93/0xa0()
sysfs group ffffffff81cb1300 not found for kobject 'target8:0:0'
CPU: 0 PID: 4692 Comm: umount Not tainted 3.14.3-200.fc20.x86_64 #1
Call Trace:
 [<ffffffff816ef242>] dump_stack+0x45/0x56
 [<ffffffff8108a1bd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8108a23c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffff81265598>] ? kernfs_find_and_get_ns+0x48/0x60
 [<ffffffff81264233>] sysfs_remove_group+0x93/0xa0
 [<ffffffff8146b543>] dpm_sysfs_remove+0x43/0x50
 [<ffffffff81460b35>] device_del+0x45/0x1c0
 [<ffffffff8148deb7>] scsi_target_reap_usercontext+0x27/0x40
 [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
 [<ffffffff8148f334>] scsi_target_reap+0xc4/0xf0
 [<ffffffff81491366>] scsi_device_dev_release_usercontext+0xe6/0x120
 [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
 [<ffffffff8149127c>] scsi_device_dev_release+0x1c/0x20
 [<ffffffff814600e2>] device_release+0x32/0xa0
 [<ffffffff813560a7>] kobject_cleanup+0x77/0x1b0
 [<ffffffff81355f60>] kobject_put+0x30/0x60
 [<ffffffff81460407>] put_device+0x17/0x20
 [<ffffffff8148268b>] scsi_device_put+0x3b/0x50
 [<ffffffff81495e50>] scsi_disk_put+0x30/0x50
 [<ffffffff814961b2>] sd_release+0x42/0xd0
 [<ffffffff8122489c>] __blkdev_put+0x16c/0x1a0
 [<ffffffff8122483e>] __blkdev_put+0x10e/0x1a0
 [<ffffffff8122521c>] blkdev_put+0x4c/0x120
 [<ffffffff811ebd64>] kill_block_super+0x44/0x70
 [<ffffffff811ec06d>] deactivate_locked_super+0x3d/0x60
 [<ffffffff811ec636>] deactivate_super+0x46/0x60
 [<ffffffff81208dac>] mntput_no_expire+0xac/0x140
 [<ffffffff8120a37d>] SyS_umount+0x9d/0x110
 [<ffffffff816ff5e9>] system_call_fastpath+0x16/0x1b
---[ end trace 6a4cda17930756e9 ]---

BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug.

poma

[Alan Stern]

On Mon, 12 May 2014, poma wrote:
> ...
> > "initial 64-byte descriptor request timeout"
> > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/driver...
> > https://www.kernel.org/doc/Documentation/kernel-parameters.txt
> > usbcore.initial_descriptor_timeout=
> > & Co.
>
> I made several tests concerning the topic and incidentally found one bug. :)
> https://bugzilla.redhat.com/show_bug.cgi?id=1096786
> Unplug the device without unmounting,
>
> ...
> usb 2-1: USB disconnect, device number 2
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 4692 at fs/sysfs/group.c:216 sysfs_remove_group+0x93/0xa0()
> sysfs group ffffffff81cb1300 not found for kobject 'target8:0:0'
> CPU: 0 PID: 4692 Comm: umount Not tainted 3.14.3-200.fc20.x86_64 #1
> Call Trace:
>  [<ffffffff816ef242>] dump_stack+0x45/0x56
>  [<ffffffff8108a1bd>] warn_slowpath_common+0x7d/0xa0
>  [<ffffffff8108a23c>] warn_slowpath_fmt+0x5c/0x80
>  [<ffffffff81265598>] ? kernfs_find_and_get_ns+0x48/0x60
>  [<ffffffff81264233>] sysfs_remove_group+0x93/0xa0
>  [<ffffffff8146b543>] dpm_sysfs_remove+0x43/0x50
>  [<ffffffff81460b35>] device_del+0x45/0x1c0
>  [<ffffffff8148deb7>] scsi_target_reap_usercontext+0x27/0x40
>  [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
>  [<ffffffff8148f334>] scsi_target_reap+0xc4/0xf0
>  [<ffffffff81491366>] scsi_device_dev_release_usercontext+0xe6/0x120
>  [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
>  [<ffffffff8149127c>] scsi_device_dev_release+0x1c/0x20
>  [<ffffffff814600e2>] device_release+0x32/0xa0
>  [<ffffffff813560a7>] kobject_cleanup+0x77/0x1b0
>  [<ffffffff81355f60>] kobject_put+0x30/0x60
>  [<ffffffff81460407>] put_device+0x17/0x20
>  [<ffffffff8148268b>] scsi_device_put+0x3b/0x50
>  [<ffffffff81495e50>] scsi_disk_put+0x30/0x50
>  [<ffffffff814961b2>] sd_release+0x42/0xd0
>  [<ffffffff8122489c>] __blkdev_put+0x16c/0x1a0
>  [<ffffffff8122483e>] __blkdev_put+0x10e/0x1a0
>  [<ffffffff8122521c>] blkdev_put+0x4c/0x120
>  [<ffffffff811ebd64>] kill_block_super+0x44/0x70
>  [<ffffffff811ec06d>] deactivate_locked_super+0x3d/0x60
>  [<ffffffff811ec636>] deactivate_super+0x46/0x60
>  [<ffffffff81208dac>] mntput_no_expire+0xac/0x140
>  [<ffffffff8120a37d>] SyS_umount+0x9d/0x110
>  [<ffffffff816ff5e9>] system_call_fastpath+0x16/0x1b
> ---[ end trace 6a4cda17930756e9 ]---
>
> BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug.

This is a known bug, as you can tell from the fact that it has already 
been fixed.  (And, as you can tell by looking at the stack dump, the 
bug was in the SCSI layer rather than the USB layer.)

Alan Stern

[poma]

On 12.05.2014 16:02, Alan Stern wrote:
> On Mon, 12 May 2014, poma wrote:
> > ...
> > > "initial 64-byte descriptor request timeout"
> > > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/driver...
> > > https://www.kernel.org/doc/Documentation/kernel-parameters.txt
> > > usbcore.initial_descriptor_timeout=
> > > & Co.
> >
> > I made several tests concerning the topic and incidentally found one bug. :)
> > https://bugzilla.redhat.com/show_bug.cgi?id=1096786
> > Unplug the device without unmounting,
> >
> > ...
> > usb 2-1: USB disconnect, device number 2
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 4692 at fs/sysfs/group.c:216 sysfs_remove_group+0x93/0xa0()
> > sysfs group ffffffff81cb1300 not found for kobject 'target8:0:0'
> > CPU: 0 PID: 4692 Comm: umount Not tainted 3.14.3-200.fc20.x86_64 #1
> > Call Trace:
> >  [<ffffffff816ef242>] dump_stack+0x45/0x56
> >  [<ffffffff8108a1bd>] warn_slowpath_common+0x7d/0xa0
> >  [<ffffffff8108a23c>] warn_slowpath_fmt+0x5c/0x80
> >  [<ffffffff81265598>] ? kernfs_find_and_get_ns+0x48/0x60
> >  [<ffffffff81264233>] sysfs_remove_group+0x93/0xa0
> >  [<ffffffff8146b543>] dpm_sysfs_remove+0x43/0x50
> >  [<ffffffff81460b35>] device_del+0x45/0x1c0
> >  [<ffffffff8148deb7>] scsi_target_reap_usercontext+0x27/0x40
> >  [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
> >  [<ffffffff8148f334>] scsi_target_reap+0xc4/0xf0
> >  [<ffffffff81491366>] scsi_device_dev_release_usercontext+0xe6/0x120
> >  [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70
> >  [<ffffffff8149127c>] scsi_device_dev_release+0x1c/0x20
> >  [<ffffffff814600e2>] device_release+0x32/0xa0
> >  [<ffffffff813560a7>] kobject_cleanup+0x77/0x1b0
> >  [<ffffffff81355f60>] kobject_put+0x30/0x60
> >  [<ffffffff81460407>] put_device+0x17/0x20
> >  [<ffffffff8148268b>] scsi_device_put+0x3b/0x50
> >  [<ffffffff81495e50>] scsi_disk_put+0x30/0x50
> >  [<ffffffff814961b2>] sd_release+0x42/0xd0
> >  [<ffffffff8122489c>] __blkdev_put+0x16c/0x1a0
> >  [<ffffffff8122483e>] __blkdev_put+0x10e/0x1a0
> >  [<ffffffff8122521c>] blkdev_put+0x4c/0x120
> >  [<ffffffff811ebd64>] kill_block_super+0x44/0x70
> >  [<ffffffff811ec06d>] deactivate_locked_super+0x3d/0x60
> >  [<ffffffff811ec636>] deactivate_super+0x46/0x60
> >  [<ffffffff81208dac>] mntput_no_expire+0xac/0x140
> >  [<ffffffff8120a37d>] SyS_umount+0x9d/0x110
> >  [<ffffffff816ff5e9>] system_call_fastpath+0x16/0x1b
> > ---[ end trace 6a4cda17930756e9 ]---
> >
> > BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug.
>
> This is a known bug, as you can tell from the fact that it has already 
> been fixed.  (And, as you can tell by looking at the stack dump, the 
> bug was in the SCSI layer rather than the USB layer.)
>
> Alan Stern

Ooh yeah!
But only for 3.15!
https://bugzilla.kernel.org/show_bug.cgi?id=69441
https://bugzilla.redhat.com/show_bug.cgi?id=1030988

Is there anything that isn't SCSI emulation? :)

poma

[Alan Stern]

On Mon, 12 May 2014, poma wrote:
> > > BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug.
> >
> > This is a known bug, as you can tell from the fact that it has already 
> > been fixed.  (And, as you can tell by looking at the stack dump, the 
> > bug was in the SCSI layer rather than the USB layer.)
> >
> > Alan Stern
>
> Ooh yeah!
> But only for 3.15!
> https://bugzilla.kernel.org/show_bug.cgi?id=69441
> https://bugzilla.redhat.com/show_bug.cgi?id=1030988

The fix will get backported to earlier stable kernel versions after
James Bottomley is satisfied that it doesn't introduce any new bugs.
> Is there anything that isn't SCSI emulation? :)

Sure: Neither your keyboard nor your mouse.  :-)

Alan Stern

[drago01]

On Mon, May 12, 2014 at 5:34 PM, Alan Stern  wrote:
> On Mon, 12 May 2014, poma wrote:
> > > > BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug.
> > >
> > > This is a known bug, as you can tell from the fact that it has already
> > > been fixed.  (And, as you can tell by looking at the stack dump, the
> > > bug was in the SCSI layer rather than the USB layer.)
> > >
> > > Alan Stern
> >
> > Ooh yeah!
> > But only for 3.15!
> > https://bugzilla.kernel.org/show_bug.cgi?id=69441
> > https://bugzilla.redhat.com/show_bug.cgi?id=1030988
>
> The fix will get backported to earlier stable kernel versions after
> James Bottomley is satisfied that it doesn't introduce any new bugs.
> > Is there anything that isn't SCSI emulation? :)
>
> Sure: Neither your keyboard nor your mouse.  :-)

Neither my touchscreen which is why I have started this thread ;)

[poma]

On 10.05.2014 17:13, drago01 wrote:
...
> [   20.172347] usb 1-4: new full-speed USB device number 12 using xhci_hcd
>
> So  the questions are 1) what do those message actually mean? Seems
> like everything works anyway 2) why do those block the boot process
> ... its not like the root fs is on a usb driver or something.

https://git.kernel.org/cgit/linux/kernel/git/sarah/xhci.git/tree/drivers/usb...
http://vger.kernel.org/vger-lists.html#linux-usb

poma