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...
But now, when V4L2 SDR module was added RTL28xxU DVB module I see quite
similar looking bug warning here too :S
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 ***
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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