[Kernel-packages] [Bug 1870014] Status changed to Confirmed

[Ubuntu Kernel Bot]

This change was made by a bot.

** Changed in: linux (Ubuntu)
   Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1870014

Title:
  task blocked too long

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I plugged in the EasyCap device, then started VLC to read from it.
  Nothing worked, and I saw the following call traces from the kernel:

  
  Mar 31 23:48:30 cerberus kernel: [49598.934870] usb 3-6: new full-speed USB 
device number 41 using xhci_hcd
  Mar 31 23:48:30 cerberus kernel: [49599.062914] usb 3-6: device descriptor 
read/64, error -71
  Mar 31 23:48:30 cerberus kernel: [49599.574905] usb 3-6: device descriptor 
read/64, error -71
  Mar 31 23:48:31 cerberus kernel: [49599.682966] usb usb3-port6: attempt power 
cycle
  Mar 31 23:48:32 cerberus kernel: [49600.974908] usb usb3-port6: Cannot 
enable. Maybe the USB cable is bad?
  Mar 31 23:48:33 cerberus kernel: [49601.946905] usb usb3-port6: Cannot 
enable. Maybe the USB cable is bad?
  Mar 31 23:48:33 cerberus kernel: [49601.946975] usb usb3-port6: unable to 
enumerate USB device
  Mar 31 23:48:45 cerberus kernel: [49614.418840] usb 3-6: new high-speed USB 
device number 44 using xhci_hcd
  Mar 31 23:48:45 cerberus kernel: [49614.570267] usb 3-6: config 1 interface 0 
altsetting 1 bulk endpoint 0x83 has invalid maxpa
  cket 256
  Mar 31 23:48:45 cerberus kernel: [49614.573126] usb 3-6: New USB device 
found, idVendor=1b71, idProduct=3002
  Mar 31 23:48:45 cerberus kernel: [49614.573130] usb 3-6: New USB device 
strings: Mfr=3, Product=4, SerialNumber=2
  Mar 31 23:48:45 cerberus kernel: [49614.573132] usb 3-6: Product: usbtv007
  Mar 31 23:48:45 cerberus kernel: [49614.573135] usb 3-6: Manufacturer: 
fushicai
  Mar 31 23:48:45 cerberus kernel: [49614.573136] usb 3-6: SerialNumber: 
3002
  Mar 31 23:48:45 cerberus kernel: [49614.574491] usbtv 3-6:1.0: Fushicai 
USBTV007 Audio-Video Grabber
  Mar 31 23:52:29 cerberus kernel: [49838.118469] usb 3-6: USB disconnect, 
device number 44
  Mar 31 23:52:44 cerberus kernel: [49853.203903] perf: interrupt took too long 
(3978 > 3967), lowering kernel.perf_event_max_sam
  ple_rate to 50250
  Mar 31 23:55:36 cerberus kernel: [50024.968505] INFO: task VideoCapture:11251 
blocked for more than 120 seconds.
  Mar 31 23:55:36 cerberus kernel: [50024.968512]   Tainted: G  IOE 
   4.15.0-94-generic #95-Ubuntu
  Mar 31 23:55:36 cerberus kernel: [50024.968514] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Mar 31 23:55:36 cerberus kernel: [50024.968517] VideoCaptureD0 11251  
1 0x
  Mar 31 23:55:36 cerberus kernel: [50024.968521] Call Trace:
  Mar 31 23:55:36 cerberus kernel: [50024.968535]  __schedule+0x24e/0x880
  Mar 31 23:55:36 cerberus kernel: [50024.968539]  schedule+0x2c/0x80
  Mar 31 23:55:36 cerberus kernel: [50024.968542]  
schedule_preempt_disabled+0xe/0x10
  Mar 31 23:55:36 cerberus kernel: [50024.968547]  
__mutex_lock.isra.5+0x276/0x4e0
  Mar 31 23:55:36 cerberus kernel: [50024.968551]  
__mutex_lock_slowpath+0x13/0x20
  Mar 31 23:55:36 cerberus kernel: [50024.968554]  ? 
__mutex_lock_slowpath+0x13/0x20
  Mar 31 23:55:36 cerberus kernel: [50024.968557]  mutex_lock+0x2f/0x40
  Mar 31 23:55:36 cerberus kernel: [50024.968569]  _vb2_fop_release+0x29/0xa0 
[videobuf2_v4l2]
  Mar 31 23:55:36 cerberus kernel: [50024.968573]  vb2_fop_release+0x31/0x40 
[videobuf2_v4l2]
  Mar 31 23:55:36 cerberus kernel: [50024.968593]  v4l2_release+0x38/0x80 
[videodev]
  Mar 31 23:55:36 cerberus kernel: [50024.968600]  __fput+0xea/0x220
  Mar 31 23:55:36 cerberus kernel: [50024.968604]  fput+0xe/0x10
  Mar 31 23:55:36 cerberus kernel: [50024.968611]  task_work_run+0x9d/0xc0
  Mar 31 23:55:36 cerberus kernel: [50024.968620]  
exit_to_usermode_loop+0xc0/0xd0
  Mar 31 23:55:36 cerberus kernel: [50024.968623]  do_syscall_64+0x121/0x130
  Mar 31 23:55:36 cerberus kernel: [50024.968630]  
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  Mar 31 23:55:36 cerberus kernel: [50024.968633] RIP: 0033:0x7f6411c26447
  Mar 31 23:55:36 cerberus kernel: [50024.968635] RSP: 002b:7f63da9bd900 
EFLAGS: 0293 ORIG_RAX: 0003
  Mar 31 23:55:36 cerberus kernel: [50024.968638] RAX:  RBX: 
0064 RCX: 7f6411c26447
  Mar 31 23:55:36 cerberus kernel: [50024.968639] RDX:  RSI: 
7f63da9bd930 RDI: 0064
  Mar 31 23:55:36 cerberus kernel: [50024.968641] RBP:  R08: 
 R09: 
  Mar 31 23:55:36 cerberus kernel: [50024.968642] R10:  R11: 
0293 R12: 7f628d4c5fa0
  Mar 31 23:55:36 cerberus kernel: [50024.968644] R13:  R14: 
7f640422d381 R15: 7f63da9bd930
  Mar 31 23:55:36 cerberus kernel: [50024.968915] INFO: task kworker/5:1:25898 
blocked for more than 120 

[Kernel-packages] [Bug 1870014] Status changed to Confirmed

[Ubuntu Kernel Bot]

This change was made by a bot.

** Changed in: linux (Ubuntu)
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1870014

Title:
  task blocked too long

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I plugged in the EasyCap device, then started VLC to read from it.
  Nothing worked, and I saw the following call traces from the kernel:

  
  Mar 31 23:48:30 cerberus kernel: [49598.934870] usb 3-6: new full-speed USB 
device number 41 using xhci_hcd
  Mar 31 23:48:30 cerberus kernel: [49599.062914] usb 3-6: device descriptor 
read/64, error -71
  Mar 31 23:48:30 cerberus kernel: [49599.574905] usb 3-6: device descriptor 
read/64, error -71
  Mar 31 23:48:31 cerberus kernel: [49599.682966] usb usb3-port6: attempt power 
cycle
  Mar 31 23:48:32 cerberus kernel: [49600.974908] usb usb3-port6: Cannot 
enable. Maybe the USB cable is bad?
  Mar 31 23:48:33 cerberus kernel: [49601.946905] usb usb3-port6: Cannot 
enable. Maybe the USB cable is bad?
  Mar 31 23:48:33 cerberus kernel: [49601.946975] usb usb3-port6: unable to 
enumerate USB device
  Mar 31 23:48:45 cerberus kernel: [49614.418840] usb 3-6: new high-speed USB 
device number 44 using xhci_hcd
  Mar 31 23:48:45 cerberus kernel: [49614.570267] usb 3-6: config 1 interface 0 
altsetting 1 bulk endpoint 0x83 has invalid maxpa
  cket 256
  Mar 31 23:48:45 cerberus kernel: [49614.573126] usb 3-6: New USB device 
found, idVendor=1b71, idProduct=3002
  Mar 31 23:48:45 cerberus kernel: [49614.573130] usb 3-6: New USB device 
strings: Mfr=3, Product=4, SerialNumber=2
  Mar 31 23:48:45 cerberus kernel: [49614.573132] usb 3-6: Product: usbtv007
  Mar 31 23:48:45 cerberus kernel: [49614.573135] usb 3-6: Manufacturer: 
fushicai
  Mar 31 23:48:45 cerberus kernel: [49614.573136] usb 3-6: SerialNumber: 
3002
  Mar 31 23:48:45 cerberus kernel: [49614.574491] usbtv 3-6:1.0: Fushicai 
USBTV007 Audio-Video Grabber
  Mar 31 23:52:29 cerberus kernel: [49838.118469] usb 3-6: USB disconnect, 
device number 44
  Mar 31 23:52:44 cerberus kernel: [49853.203903] perf: interrupt took too long 
(3978 > 3967), lowering kernel.perf_event_max_sam
  ple_rate to 50250
  Mar 31 23:55:36 cerberus kernel: [50024.968505] INFO: task VideoCapture:11251 
blocked for more than 120 seconds.
  Mar 31 23:55:36 cerberus kernel: [50024.968512]   Tainted: G  IOE 
   4.15.0-94-generic #95-Ubuntu
  Mar 31 23:55:36 cerberus kernel: [50024.968514] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Mar 31 23:55:36 cerberus kernel: [50024.968517] VideoCaptureD0 11251  
1 0x
  Mar 31 23:55:36 cerberus kernel: [50024.968521] Call Trace:
  Mar 31 23:55:36 cerberus kernel: [50024.968535]  __schedule+0x24e/0x880
  Mar 31 23:55:36 cerberus kernel: [50024.968539]  schedule+0x2c/0x80
  Mar 31 23:55:36 cerberus kernel: [50024.968542]  
schedule_preempt_disabled+0xe/0x10
  Mar 31 23:55:36 cerberus kernel: [50024.968547]  
__mutex_lock.isra.5+0x276/0x4e0
  Mar 31 23:55:36 cerberus kernel: [50024.968551]  
__mutex_lock_slowpath+0x13/0x20
  Mar 31 23:55:36 cerberus kernel: [50024.968554]  ? 
__mutex_lock_slowpath+0x13/0x20
  Mar 31 23:55:36 cerberus kernel: [50024.968557]  mutex_lock+0x2f/0x40
  Mar 31 23:55:36 cerberus kernel: [50024.968569]  _vb2_fop_release+0x29/0xa0 
[videobuf2_v4l2]
  Mar 31 23:55:36 cerberus kernel: [50024.968573]  vb2_fop_release+0x31/0x40 
[videobuf2_v4l2]
  Mar 31 23:55:36 cerberus kernel: [50024.968593]  v4l2_release+0x38/0x80 
[videodev]
  Mar 31 23:55:36 cerberus kernel: [50024.968600]  __fput+0xea/0x220
  Mar 31 23:55:36 cerberus kernel: [50024.968604]  fput+0xe/0x10
  Mar 31 23:55:36 cerberus kernel: [50024.968611]  task_work_run+0x9d/0xc0
  Mar 31 23:55:36 cerberus kernel: [50024.968620]  
exit_to_usermode_loop+0xc0/0xd0
  Mar 31 23:55:36 cerberus kernel: [50024.968623]  do_syscall_64+0x121/0x130
  Mar 31 23:55:36 cerberus kernel: [50024.968630]  
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  Mar 31 23:55:36 cerberus kernel: [50024.968633] RIP: 0033:0x7f6411c26447
  Mar 31 23:55:36 cerberus kernel: [50024.968635] RSP: 002b:7f63da9bd900 
EFLAGS: 0293 ORIG_RAX: 0003
  Mar 31 23:55:36 cerberus kernel: [50024.968638] RAX:  RBX: 
0064 RCX: 7f6411c26447
  Mar 31 23:55:36 cerberus kernel: [50024.968639] RDX:  RSI: 
7f63da9bd930 RDI: 0064
  Mar 31 23:55:36 cerberus kernel: [50024.968641] RBP:  R08: 
 R09: 
  Mar 31 23:55:36 cerberus kernel: [50024.968642] R10:  R11: 
0293 R12: 7f628d4c5fa0
  Mar 31 23:55:36 cerberus kernel: [50024.968644] R13:  R14: 
7f640422d381 R15: 7f63da9bd930
  Mar 31 23:55:36 cerberus kernel: [50024.968915] INFO: task kworker/5:1:25898 
blocked for more than 120