Any idea what are there bugs?
Apr 10 00:21:41 localhost kernel: [ 355.292348] usb 2-2: USB
disconnect, device number 2
Apr 10 00:21:41 localhost kernel: [ 355.294357] em2874 #0:
disconnecting em2874 #0 video
Apr 10 00:21:41 localhost kernel: [ 355.294517]
Apr 10 00:21:41 localhost kernel: [ 355.294523]
======================================================
Apr 10 00:21:41 localhost kernel: [ 355.294528] [ INFO: possible
circular locking dependency detected ]
Apr 10 00:21:41 localhost kernel: [ 355.294535] 3.9.0-rc5+ #39 Tainted:
G O
Apr 10 00:21:41 localhost kernel: [ 355.294539]
-------------------------------------------------------
Apr 10 00:21:41 localhost kernel: [ 355.294544] khubd/34 is trying to
acquire lock:
Apr 10 00:21:41 localhost kernel: [ 355.294549]
(em28xx_devlist_mutex){+.+.+.}, at: [<ffffffffa0471b7d>]
em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294576]
Apr 10 00:21:41 localhost kernel: [ 355.294576] but task is already
holding lock:
Apr 10 00:21:41 localhost kernel: [ 355.294582] (&dev->lock){+.+.+.},
at: [<ffffffffa046f719>] em28xx_usb_disconnect+0x99/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294602]
Apr 10 00:21:41 localhost kernel: [ 355.294602] which lock already
depends on the new lock.
Apr 10 00:21:41 localhost kernel: [ 355.294602]
Apr 10 00:21:41 localhost kernel: [ 355.294609]
Apr 10 00:21:41 localhost kernel: [ 355.294609] the existing dependency
chain (in reverse order) is:
Apr 10 00:21:41 localhost kernel: [ 355.294614]
Apr 10 00:21:41 localhost kernel: [ 355.294614] -> #1 (&dev->lock){+.+.+.}:
Apr 10 00:21:41 localhost kernel: [ 355.294624]
[<ffffffff810c8821>] lock_acquire+0xa1/0x140
Apr 10 00:21:41 localhost kernel: [ 355.294635]
[<ffffffff8169f636>] mutex_lock_nested+0x76/0x390
Apr 10 00:21:41 localhost kernel: [ 355.294645]
[<ffffffffa048763c>] em28xx_dvb_init+0x7c/0x1a14 [em28xx_dvb]
Apr 10 00:21:41 localhost kernel: [ 355.294655]
[<ffffffffa046f9d8>] em28xx_register_extension+0x58/0xa0 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294668]
[<ffffffffa04b6010>] 0xffffffffa04b6010
Apr 10 00:21:41 localhost kernel: [ 355.294684]
[<ffffffff8100215a>] do_one_initcall+0x12a/0x180
Apr 10 00:21:41 localhost kernel: [ 355.294692]
[<ffffffff810d72e6>] load_module+0x1c36/0x27f0
Apr 10 00:21:41 localhost kernel: [ 355.294700]
[<ffffffff810d7f77>] sys_init_module+0xd7/0x120
Apr 10 00:21:41 localhost kernel: [ 355.294707]
[<ffffffff816acc99>] system_call_fastpath+0x16/0x1b
Apr 10 00:21:41 localhost kernel: [ 355.294717]
Apr 10 00:21:41 localhost kernel: [ 355.294717] -> #0
(em28xx_devlist_mutex){+.+.+.}:
Apr 10 00:21:41 localhost kernel: [ 355.294727]
[<ffffffff810c80f8>] __lock_acquire+0x1c88/0x1d50
Apr 10 00:21:41 localhost kernel: [ 355.294734]
[<ffffffff810c8821>] lock_acquire+0xa1/0x140
Apr 10 00:21:41 localhost kernel: [ 355.294741]
[<ffffffff8169f636>] mutex_lock_nested+0x76/0x390
Apr 10 00:21:41 localhost kernel: [ 355.294749]
[<ffffffffa0471b7d>] em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294762]
[<ffffffffa046f733>] em28xx_usb_disconnect+0xb3/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294775]
[<ffffffff8149cbf3>] usb_unbind_interface+0x63/0x1b0
Apr 10 00:21:41 localhost kernel: [ 355.294784]
[<ffffffff814187ac>] __device_release_driver+0x7c/0xf0
Apr 10 00:21:41 localhost kernel: [ 355.294791]
[<ffffffff81418afe>] device_release_driver+0x2e/0x40
Apr 10 00:21:41 localhost kernel: [ 355.294799]
[<ffffffff81418222>] bus_remove_device+0x102/0x180
Apr 10 00:21:41 localhost kernel: [ 355.294806]
[<ffffffff8141557f>] device_del+0x12f/0x1c0
Apr 10 00:21:41 localhost kernel: [ 355.294814]
[<ffffffff8149a4f0>] usb_disable_device+0xb0/0x270
Apr 10 00:21:41 localhost kernel: [ 355.294822]
[<ffffffff814907e5>] usb_disconnect+0xb5/0x1d0
Apr 10 00:21:41 localhost kernel: [ 355.294831]
[<ffffffff81491fbd>] hub_port_connect_change+0xcd/0xab0
Apr 10 00:21:41 localhost kernel: [ 355.294840]
[<ffffffff81492ca0>] hub_events+0x300/0x920
Apr 10 00:21:41 localhost kernel: [ 355.294848]
[<ffffffff814932f5>] hub_thread+0x35/0x1f0
Apr 10 00:21:41 localhost kernel: [ 355.294857]
[<ffffffff81087d8d>] kthread+0xed/0x100
Apr 10 00:21:41 localhost kernel: [ 355.294866]
[<ffffffff816acbec>] ret_from_fork+0x7c/0xb0
Apr 10 00:21:41 localhost kernel: [ 355.294874]
Apr 10 00:21:41 localhost kernel: [ 355.294874] other info that might
help us debug this:
Apr 10 00:21:41 localhost kernel: [ 355.294874]
Apr 10 00:21:41 localhost kernel: [ 355.294882] Possible unsafe
locking scenario:
Apr 10 00:21:41 localhost kernel: [ 355.294882]
Apr 10 00:21:41 localhost kernel: [ 355.294887] CPU0
CPU1
Apr 10 00:21:41 localhost kernel: [ 355.294890] ----
----
Apr 10 00:21:41 localhost kernel: [ 355.294894] lock(&dev->lock);
Apr 10 00:21:41 localhost kernel: [ 355.294900]
lock(em28xx_devlist_mutex);
Apr 10 00:21:41 localhost kernel: [ 355.294907]
lock(&dev->lock);
Apr 10 00:21:41 localhost kernel: [ 355.294912]
lock(em28xx_devlist_mutex);
Apr 10 00:21:41 localhost kernel: [ 355.294919]
Apr 10 00:21:41 localhost kernel: [ 355.294919] *** DEADLOCK ***
Apr 10 00:21:41 localhost kernel: [ 355.294919]
Apr 10 00:21:41 localhost kernel: [ 355.294926] 4 locks held by khubd/34:
Apr 10 00:21:41 localhost kernel: [ 355.294930] #0:
(&__lockdep_no_validate__){......}, at: [<ffffffff81492a51>]
hub_events+0xb1/0x920
Apr 10 00:21:41 localhost kernel: [ 355.294945] #1:
(&__lockdep_no_validate__){......}, at: [<ffffffff81490796>]
usb_disconnect+0x66/0x1d0
Apr 10 00:21:41 localhost kernel: [ 355.294960] #2:
(&__lockdep_no_validate__){......}, at: [<ffffffff81418af6>]
device_release_driver+0x26/0x40
Apr 10 00:21:41 localhost kernel: [ 355.294974] #3:
(&dev->lock){+.+.+.}, at: [<ffffffffa046f719>]
em28xx_usb_disconnect+0x99/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.294993]
Apr 10 00:21:41 localhost kernel: [ 355.294993] stack backtrace:
Apr 10 00:21:41 localhost kernel: [ 355.295000] Pid: 34, comm: khubd
Tainted: G O 3.9.0-rc5+ #39
Apr 10 00:21:41 localhost kernel: [ 355.295005] Call Trace:
Apr 10 00:21:41 localhost kernel: [ 355.295017] [<ffffffff81695cb6>]
print_circular_bug+0x1fb/0x20c
Apr 10 00:21:41 localhost kernel: [ 355.295026] [<ffffffff810c80f8>]
__lock_acquire+0x1c88/0x1d50
Apr 10 00:21:41 localhost kernel: [ 355.295035] [<ffffffff810c688e>] ?
__lock_acquire+0x41e/0x1d50
Apr 10 00:21:41 localhost kernel: [ 355.295045] [<ffffffff8101cc43>] ?
native_sched_clock+0x13/0x80
Apr 10 00:21:41 localhost kernel: [ 355.295055] [<ffffffff816a3d30>] ?
_raw_spin_unlock_irq+0x30/0x50
Apr 10 00:21:41 localhost kernel: [ 355.295064] [<ffffffff810c8821>]
lock_acquire+0xa1/0x140
Apr 10 00:21:41 localhost kernel: [ 355.295078] [<ffffffffa0471b7d>] ?
em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295086] [<ffffffff810c4ae2>] ?
mark_held_locks+0xb2/0x130
Apr 10 00:21:41 localhost kernel: [ 355.295095] [<ffffffff8169f8a6>] ?
mutex_lock_nested+0x2e6/0x390
Apr 10 00:21:41 localhost kernel: [ 355.295105] [<ffffffff8169f636>]
mutex_lock_nested+0x76/0x390
Apr 10 00:21:41 localhost kernel: [ 355.295118] [<ffffffffa0471b7d>] ?
em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295127] [<ffffffff8169f882>] ?
mutex_lock_nested+0x2c2/0x390
Apr 10 00:21:41 localhost kernel: [ 355.295140] [<ffffffffa046f719>] ?
em28xx_usb_disconnect+0x99/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295153] [<ffffffffa0471b7d>] ?
em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295167] [<ffffffffa046f719>] ?
em28xx_usb_disconnect+0x99/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295175] [<ffffffff81694cfe>] ?
printk+0x61/0x63
Apr 10 00:21:41 localhost kernel: [ 355.295188] [<ffffffffa0471b7d>]
em28xx_close_extension+0x1d/0x70 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295202] [<ffffffffa046f733>]
em28xx_usb_disconnect+0xb3/0x140 [em28xx]
Apr 10 00:21:41 localhost kernel: [ 355.295211] [<ffffffff8149cbf3>]
usb_unbind_interface+0x63/0x1b0
Apr 10 00:21:41 localhost kernel: [ 355.295220] [<ffffffff814187ac>]
__device_release_driver+0x7c/0xf0
Apr 10 00:21:41 localhost kernel: [ 355.295228] [<ffffffff81418afe>]
device_release_driver+0x2e/0x40
Apr 10 00:21:41 localhost kernel: [ 355.295236] [<ffffffff81418222>]
bus_remove_device+0x102/0x180
Apr 10 00:21:41 localhost kernel: [ 355.295245] [<ffffffff8141557f>]
device_del+0x12f/0x1c0
Apr 10 00:21:41 localhost kernel: [ 355.295253] [<ffffffff8149a4f0>]
usb_disable_device+0xb0/0x270
Apr 10 00:21:41 localhost kernel: [ 355.295264] [<ffffffff8119d1f2>] ?
kfree+0xb2/0x1d0
Apr 10 00:21:41 localhost kernel: [ 355.295273] [<ffffffff814907e5>]
usb_disconnect+0xb5/0x1d0
Apr 10 00:21:41 localhost kernel: [ 355.295284] [<ffffffff81491fbd>]
hub_port_connect_change+0xcd/0xab0
Apr 10 00:21:41 localhost kernel: [ 355.295292] [<ffffffff81499a80>] ?
usb_control_msg+0xf0/0x140
Apr 10 00:21:41 localhost kernel: [ 355.295301] [<ffffffff8148ca23>] ?
hub_port_status+0x83/0x120
Apr 10 00:21:41 localhost kernel: [ 355.295311] [<ffffffff81492ca0>]
hub_events+0x300/0x920
Apr 10 00:21:41 localhost kernel: [ 355.295322] [<ffffffff814932f5>]
hub_thread+0x35/0x1f0
Apr 10 00:21:41 localhost kernel: [ 355.295331] [<ffffffff81088440>] ?
wake_up_bit+0x40/0x40
Apr 10 00:21:41 localhost kernel: [ 355.295341] [<ffffffff814932c0>] ?
hub_events+0x920/0x920
Apr 10 00:21:41 localhost kernel: [ 355.295350] [<ffffffff81087d8d>]
kthread+0xed/0x100
Apr 10 00:21:41 localhost kernel: [ 355.295361] [<ffffffff81087ca0>] ?
kthread_create_on_node+0x160/0x160
Apr 10 00:21:41 localhost kernel: [ 355.295370] [<ffffffff816acbec>]
ret_from_fork+0x7c/0xb0
Apr 10 00:21:41 localhost kernel: [ 355.295379] [<ffffffff81087ca0>] ?
kthread_create_on_node+0x160/0x160
Apr 10 00:21:41 localhost kernel: [ 355.299531] em2874 #0: V4L2 device
video0 deregistered
Apr 10 00:22:02 localhost kernel: [ 375.763842] TCP: lp registered
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