Am 21.12.2013 20:55, schrieb Antti Palosaari:
> On 21.12.2013 18:51, Frank Schäfer wrote:
>> Hi Antti,
>>
>> thank you for reporting this issue.
>>
>> Am 18.12.2013 17:04, schrieb Antti Palosaari:
>>> That same lock debug deadlock is still there (maybe ~4 times I report
>>> it during 2 years). Is that possible to fix easily at all?
>>
>> Patches are always welcome. ;)
>
> haha, I cannot simply learn every driver I meet some problems...
Hint:
If you report a bug ~4 times in 2 years but never get a reply, it
usually means
a) nobody cares
b) nobody has the resources (time, knowledge) to fix it.
So you either have to live with this issue or to fix it yourself.
>
> But now, when V4L2 SDR module was added RTL28xxU DVB module I see
> quite similar looking bug warning here too :
>
> I wonder if that is same...
>
>
> joulu 21 21:49:19 localhost.localdomain kernel: usb 2-2:
> rtl2832_sdr_queue_setup: nbuffers=32 sizes[0]=131072
> joulu 21 21:49:19 localhost.localdomain kernel: joulu 21 21:49:19
> localhost.localdomain kernel:
> ======================================================
> joulu 21 21:49:19 localhost.localdomain kernel: [ INFO: possible
> circular locking dependency detected ]
> joulu 21 21:49:19 localhost.localdomain kernel: 3.13.0-rc1+ #77
> Tainted: G C O
> joulu 21 21:49:19 localhost.localdomain kernel:
> -------------------------------------------------------
> joulu 21 21:49:19 localhost.localdomain kernel: python/15284 is trying
> to acquire lock:
> joulu 21 21:49:19 localhost.localdomain kernel:
> (&s->vb_queue_lock){+.+.+.}, at: [<ffffffffa06d0de3>]
> vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel:
> but task is already
> holding lock:
> joulu 21 21:49:19 localhost.localdomain kernel:
> (&mm->mmap_sem){++++++}, at: [<ffffffff8117825f>] vm_mmap_pgoff+0x6f/0xc0
> joulu 21 21:49:19 localhost.localdomain kernel:
> which lock already
> depends on the new lock.
> joulu 21 21:49:19 localhost.localdomain kernel:
> the existing
> dependency chain (in reverse order) is:
> joulu 21 21:49:19 localhost.localdomain kernel:
> -> #1
> (&mm->mmap_sem){++++++}:
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bb386>]
> __lock_acquire+0x3d6/0xc40
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bbca0>]
> lock_acquire+0xb0/0x150
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff81181f3c>]
> might_fault+0x8c/0xb0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06a9dba>]
> video_usercopy+0xba/0x4e0 [videodev]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06aa1f5>]
> video_ioctl2+0x15/0x20 [videodev]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06a3e73>]
> v4l2_ioctl+0x153/0x240 [videodev]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff811e0590>]
> do_vfs_ioctl+0x300/0x520
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff811e0831>]
> SyS_ioctl+0x81/0xa0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816ca729>]
> system_call_fastpath+0x16/0x1b
> joulu 21 21:49:19 localhost.localdomain kernel:
> -> #0
> (&s->vb_queue_lock){+.+.+.}:
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810b96b7>]
> validate_chain.isra.36+0x10d7/0x1130
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bb386>]
> __lock_acquire+0x3d6/0xc40
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bbca0>]
> lock_acquire+0xb0/0x150
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816bf1c7>]
> mutex_lock_interruptible_nested+0x77/0x460
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06d0de3>]
> vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06a385a>]
> v4l2_mmap+0x5a/0xa0 [videodev]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118da7d>]
> mmap_region+0x3cd/0x5a0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118dfa7>]
> do_mmap_pgoff+0x357/0x3e0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff81178280>]
> vm_mmap_pgoff+0x90/0xc0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118c553>]
> SyS_mmap_pgoff+0x1d3/0x270
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810191a2>]
> SyS_mmap+0x22/0x30
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816ca729>]
> system_call_fastpath+0x16/0x1b
> joulu 21 21:49:19 localhost.localdomain kernel:
> other info that might
> help us debug this:
> joulu 21 21:49:19 localhost.localdomain kernel: Possible unsafe
> locking scenario:
> joulu 21 21:49:19 localhost.localdomain kernel: CPU0 CPU1
> joulu 21 21:49:19 localhost.localdomain kernel: ---- ----
> joulu 21 21:49:19 localhost.localdomain kernel: lock(&mm->mmap_sem);
> joulu 21 21:49:19 localhost.localdomain kernel:
> lock(&s->vb_queue_lock);
> joulu 21 21:49:19 localhost.localdomain kernel:
> lock(&mm->mmap_sem);
> joulu 21 21:49:19 localhost.localdomain kernel:
> lock(&s->vb_queue_lock);
> joulu 21 21:49:19 localhost.localdomain kernel:
> *** DEADLOCK ***
I can't see any relationship with the em28xx issue, except that both
warnings are about possible deadlocks. ;)
I'm not even sure if it is a RTL28xxU issue.
Sorry, -ENORESOURCES for this.
Regards,
Frank
> joulu 21 21:49:19 localhost.localdomain kernel: 1 lock held by
> python/15284:
> joulu 21 21:49:19 localhost.localdomain kernel: #0:
> (&mm->mmap_sem){++++++}, at: [<ffffffff8117825f>] vm_mmap_pgoff+0x6f/0xc0
> joulu 21 21:49:19 localhost.localdomain kernel:
> stack backtrace:
> joulu 21 21:49:19 localhost.localdomain kernel: CPU: 3 PID: 15284
> Comm: python Tainted: G C O 3.13.0-rc1+ #77
> joulu 21 21:49:19 localhost.localdomain kernel: Hardware name: System
> manufacturer System Product Name/M5A78L-M/USB3, BIOS 1503 11/14/2012
> joulu 21 21:49:19 localhost.localdomain kernel: ffffffff824fab50
> ffff88025c5efb68 ffffffff816b8da9 ffffffff824fab50
> joulu 21 21:49:19 localhost.localdomain kernel: ffff88025c5efba8
> ffffffff816b2c9b ffff88025c5efbe0 0000000000000000
> joulu 21 21:49:19 localhost.localdomain kernel: ffff880202ce6c18
> 0000000000000001 ffff880202ce6590 ffff880202ce6c18
> joulu 21 21:49:19 localhost.localdomain kernel: Call Trace:
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816b8da9>]
> dump_stack+0x4d/0x66
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816b2c9b>]
> print_circular_bug+0x200/0x20e
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810b96b7>]
> validate_chain.isra.36+0x10d7/0x1130
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bb3a7>]
> ? __lock_acquire+0x3f7/0xc40
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8101c413>]
> ? native_sched_clock+0x13/0x80
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bb386>]
> __lock_acquire+0x3d6/0xc40
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff81182706>]
> ? __do_fault+0x236/0x510
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8101c413>]
> ? native_sched_clock+0x13/0x80
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8101c489>]
> ? sched_clock+0x9/0x10
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810bbca0>]
> lock_acquire+0xb0/0x150
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06d0de3>]
> ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816bf1c7>]
> mutex_lock_interruptible_nested+0x77/0x460
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06d0de3>]
> ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06d0de3>]
> ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06d0de3>]
> vb2_fop_mmap+0x33/0x90 [videobuf2_core]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffffa06a385a>]
> v4l2_mmap+0x5a/0xa0 [videodev]
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118da7d>]
> mmap_region+0x3cd/0x5a0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118dfa7>]
> do_mmap_pgoff+0x357/0x3e0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff81178280>]
> vm_mmap_pgoff+0x90/0xc0
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff8118c553>]
> SyS_mmap_pgoff+0x1d3/0x270
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff810191a2>]
> SyS_mmap+0x22/0x30
> joulu 21 21:49:19 localhost.localdomain kernel: [<ffffffff816ca729>]
> system_call_fastpath+0x16/0x1b
> joulu 21 21:49:19 localhost.localdomain kernel: usb 2-2:
> rtl2832_sdr_start_streaming:
> joulu 21 21:49:19 localhost.localdomain kernel: usb 2-2:
> rtl2832u_power_ctrl: onoff=1
> joulu 21 21:49:19 localhost.localdomain kernel: usb 2-2:
> rtl28xxu_ctrl_msg: c0 00 01 30 00 02 01 00 <<< 18
>
>
>
>
>>
>>>
>>>
>>> Antti
>>>
>>>
>>>
>>> joulu 18 17:56:37 localhost.localdomain kernel: usb 2-2: USB
>>> disconnect, device number 2
>>> joulu 18 17:56:37 localhost.localdomain kernel: em28174 #0:
>>> disconnecting em28174 #0 video
>>> joulu 18 17:56:37 localhost.localdomain kernel: joulu 18 17:56:37
>>> localhost.localdomain kernel:
>>> ======================================================
>>> joulu 18 17:56:37 localhost.localdomain kernel: [ INFO: possible
>>> circular locking dependency detected ]
>>> joulu 18 17:56:37 localhost.localdomain kernel: 3.13.0-rc1+ #77
>>> Tainted: G C O
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> -------------------------------------------------------
>>> joulu 18 17:56:37 localhost.localdomain kernel: khubd/34 is trying to
>>> acquire lock:
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> (em28xx_devlist_mutex){+.+.+.}, at: [<ffffffffa06edd0d>]
>>> em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> but task is already
>>> holding lock:
>>> joulu 18 17:56:37 localhost.localdomain kernel: (&dev->lock){+.+.+.},
>>> at: [<ffffffffa06eb689>] em28xx_usb_disconnect+0x99/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> which lock already
>>> depends on the new lock.
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> the existing
>>> dependency chain (in reverse order) is:
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> -> #1
>>> (&dev->lock){+.+.+.}:
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bb386>]
>>> __lock_acquire+0x3d6/0xc40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bbca0>]
>>> lock_acquire+0xb0/0x150
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816be5b7>]
>>> mutex_lock_nested+0x77/0x3d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa077b6d5>]
>>> em28xx_dvb_init+0x85/0x1b44 [em28xx_dvb]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06eb908>]
>>> em28xx_register_extension+0x58/0xa0 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa0783010>]
>>> 0xffffffffa0783010
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff8100214a>]
>>> do_one_initcall+0xfa/0x1b0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810eec72>]
>>> load_module+0x13c2/0x1a80
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810ef4c6>]
>>> SyS_finit_module+0x86/0xb0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816ca729>]
>>> system_call_fastpath+0x16/0x1b
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> -> #0
>>> (em28xx_devlist_mutex){+.+.+.}:
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810b96b7>]
>>> validate_chain.isra.36+0x10d7/0x1130
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bb386>]
>>> __lock_acquire+0x3d6/0xc40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bbca0>]
>>> lock_acquire+0xb0/0x150
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816be5b7>]
>>> mutex_lock_nested+0x77/0x3d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06edd0d>]
>>> em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06eb6a3>]
>>> em28xx_usb_disconnect+0xb3/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814b7c87>]
>>> usb_unbind_interface+0x67/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814378ff>]
>>> __device_release_driver+0x7f/0xf0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81437995>]
>>> device_release_driver+0x25/0x40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814371fc>]
>>> bus_remove_device+0x11c/0x1a0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81433c26>]
>>> device_del+0x136/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814b5660>]
>>> usb_disable_device+0xb0/0x290
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814aa5f5>]
>>> usb_disconnect+0xb5/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814acfe6>]
>>> hub_port_connect_change+0xd6/0xad0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814adcf3>]
>>> hub_events+0x313/0x9b0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814ae3c5>]
>>> hub_thread+0x35/0x190
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff8109044f>]
>>> kthread+0xff/0x120
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816ca67c>]
>>> ret_from_fork+0x7c/0xb0
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> other info that might
>>> help us debug this:
>>> joulu 18 17:56:37 localhost.localdomain kernel: Possible unsafe
>>> locking scenario:
>>> joulu 18 17:56:37 localhost.localdomain kernel: CPU0 CPU1
>>> joulu 18 17:56:37 localhost.localdomain kernel: ---- ----
>>> joulu 18 17:56:37 localhost.localdomain kernel: lock(&dev->lock);
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> lock(em28xx_devlist_mutex);
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> lock(&dev->lock);
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> lock(em28xx_devlist_mutex);
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> *** DEADLOCK ***
>>
>> AFAICS, this deadlock can not occur.
>> em28xx_usb_disconnect() calls flush_request_modules() before acquiring
>> dev->lock which calls flush_work() to cancel module initialization.
>> And flush_work() is actually flush_work_sync() these days, so module
>> initialization should always be finished before dev->lock is acquired.
>>
>> However, it would of course be nice to get this false warning fixed.
>> Any suggestions ? :)
>>
>> Regards,
>> Frank
>>
>>> joulu 18 17:56:37 localhost.localdomain kernel: 4 locks held by
>>> khubd/34:
>>> joulu 18 17:56:37 localhost.localdomain kernel: #0:
>>> (&__lockdep_no_validate__){......}, at: [<ffffffff814ada94>]
>>> hub_events+0xb4/0x9b0
>>> joulu 18 17:56:37 localhost.localdomain kernel: #1:
>>> (&__lockdep_no_validate__){......}, at: [<ffffffff814aa5a6>]
>>> usb_disconnect+0x66/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: #2:
>>> (&__lockdep_no_validate__){......}, at: [<ffffffff8143798d>]
>>> device_release_driver+0x1d/0x40
>>> joulu 18 17:56:37 localhost.localdomain kernel: #3:
>>> (&dev->lock){+.+.+.}, at: [<ffffffffa06eb689>]
>>> em28xx_usb_disconnect+0x99/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel:
>>> stack backtrace:
>>> joulu 18 17:56:37 localhost.localdomain kernel: CPU: 3 PID: 34 Comm:
>>> khubd Tainted: G C O 3.13.0-rc1+ #77
>>> joulu 18 17:56:37 localhost.localdomain kernel: Hardware name: System
>>> manufacturer System Product Name/M5A78L-M/USB3, BIOS 1503 11/14/2012
>>> joulu 18 17:56:37 localhost.localdomain kernel: ffffffff824f59f0
>>> ffff88030dbb98e8 ffffffff816b8da9 ffffffff824f59f0
>>> joulu 18 17:56:37 localhost.localdomain kernel: ffff88030dbb9928
>>> ffffffff816b2c9b ffff88030dbb9960 0000000000000003
>>> joulu 18 17:56:37 localhost.localdomain kernel: ffff88030da1afd0
>>> 0000000000000004 ffff88030da1a8a0 ffff88030da1afd0
>>> joulu 18 17:56:37 localhost.localdomain kernel: Call Trace:
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816b8da9>]
>>> dump_stack+0x4d/0x66
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816b2c9b>]
>>> print_circular_bug+0x200/0x20e
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810b96b7>]
>>> validate_chain.isra.36+0x10d7/0x1130
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff8101c413>]
>>> ? native_sched_clock+0x13/0x80
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bb386>]
>>> __lock_acquire+0x3d6/0xc40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bb3a7>]
>>> ? __lock_acquire+0x3f7/0xc40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810bbca0>]
>>> lock_acquire+0xb0/0x150
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06edd0d>]
>>> ? em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816be5b7>]
>>> mutex_lock_nested+0x77/0x3d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06edd0d>]
>>> ? em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810b9e6d>]
>>> ? trace_hardirqs_on+0xd/0x10
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06edd0d>]
>>> ? em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06eb689>]
>>> ? em28xx_usb_disconnect+0x99/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06eb689>]
>>> ? em28xx_usb_disconnect+0x99/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06edd0d>]
>>> em28xx_close_extension+0x1d/0x70 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffffa06eb6a3>]
>>> em28xx_usb_disconnect+0xb3/0x140 [em28xx]
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814b7c87>]
>>> usb_unbind_interface+0x67/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814378ff>]
>>> __device_release_driver+0x7f/0xf0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81437995>]
>>> device_release_driver+0x25/0x40
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814371fc>]
>>> bus_remove_device+0x11c/0x1a0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81433c26>]
>>> device_del+0x136/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814b5660>]
>>> usb_disable_device+0xb0/0x290
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814aa5f5>]
>>> usb_disconnect+0xb5/0x1d0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814acfe6>]
>>> hub_port_connect_change+0xd6/0xad0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814b40a4>]
>>> ? usb_control_msg+0xd4/0x110
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814adcf3>]
>>> hub_events+0x313/0x9b0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814ae3c5>]
>>> hub_thread+0x35/0x190
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff810b12d0>]
>>> ? abort_exclusive_wait+0xb0/0xb0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff814ae390>]
>>> ? hub_events+0x9b0/0x9b0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff8109044f>]
>>> kthread+0xff/0x120
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81090350>]
>>> ? kthread_create_on_node+0x250/0x250
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff816ca67c>]
>>> ret_from_fork+0x7c/0xb0
>>> joulu 18 17:56:37 localhost.localdomain kernel: [<ffffffff81090350>]
>>> ? kthread_create_on_node+0x250/0x250
>>> joulu 18 17:56:37 localhost.localdomain kernel: tda18271 6-0060:
>>> destroying instance
>>> joulu 18 17:56:37 localhost.localdomain kernel: rc_unregister_device:
>>> Freed keycode table
>>> joulu 18 17:56:37 localhost.localdomain kernel: em28174 #0: V4L2
>>> device video0 deregistered
>>> joulu 18 17:56:37 localhost.localdomain kernel: i2c i2c-6: adapter
>>> [em28174 #0] unregistered
>>> joulu 18 17:56:37 localhost.localdomain kernel: i2c i2c-5: adapter
>>> [em28174 #0] unregistered
>>> joulu 18 17:56:37 localhost.localdomain colord[603]: device removed:
>>> sysfs-PCTV_Systems-PCTV_290e
>>>
>>
>
>
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