Slow boot due to USB errors

[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/drivers/usb/core/hub.c#n67
>>> 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