F16: Kernel bug with USB disks ?

[Caterpillar]

2012/3/28 Terry Barnaby <terry1 at beam.ltd.uk>

> On 03/26/2012 09:20 PM, J. Randall Owens wrote:
> > On 03/26/2012 06:05 AM, Terry Barnaby wrote:
> >> Hi,
> >>
> >> I am using the latest F16 kernel: 3.3.0-4.fc16.i686.PAE and am having
> >> problems with a MicroSD card connected to a USB card reader. This has
> >> been working fine until recently (at least in F14 on the same hardware).
> >>
> >> The problem is that "umount" does not appear to be working correctly.
> >> I have an ext3 file system on the card. I can mount it, and I can copy
> >> files to it. However when I use the "umount ..." command it returns
> >> instantly (should sync the files to the card). The system says the card
> >> is unmounted (at least it is not listed with mount, df etc).
> >>
> >> However if I run sync, there is a lot of disk activity to the card ...
> >>
> >> Also if I try and run "mkfs" it says the device in in use ...
> >> If I mount a blank card it lists the files present on the previous card
> ...
> >>
> >> This sounds like a nasty kernel bug ...
> >> Anyone else seen this ?
> >
> > I thought I'd noticed something like this with 3.2.x kernels also; I
> > couldn't narrow it down more than that.  In my case, it's a USB external
> > HDD.  After unmounting, I have an old habit of running 3 syncs in one
> > line.  And lately, I've noticed that I don't even get that disk activity
> > until I give it a second trio of syncs, which certainly doesn't seem
> right.
> > Let me check right now with 3.3.0-4...  Odd, now I do get the activity
> > at about the same time as the umount, and no further activity when I
> > issue the syncs.  Seems to be the opposite of what you've reported.
> >
> Kernel 3.2.10-3.fc16.i686.PAE also appears to be broken.
> This seems really very nasty, does it apply to other disks or just to USB
> ones ...
> I have added Bugzilla bug: 806909 for this.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=806909
>
> Cheers
>
>
> Terry
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I just commented your bugreport with mine that submitted some months ago
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