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[Bug 1526657] Re: desktop freeze, htop shows kernel thread at 100% cpu


Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.4 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc5-wily

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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

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  desktop freeze, htop shows kernel thread at 100% cpu

Status in linux package in Ubuntu:

Bug description:
  Every few hours the desktop freezes.  I can still login via ssh, htop
  shows one process running at 100%.  The process is shown in red,
  indicating a kernel thread.   No response to ctrl-alt-f1  or to
  service lightdm restart.

  Graphics card is NVIDIA NVS 310.

  I've tried the NVIDIA drivers in various versions up to nvidia-
  current, and also nouveau (current bug report is with logfiles etc
  generated after a crash while running nouveau).

  Xorg.log shows a seg fault:

  [171809.988] (EE) 
  [171809.988] (EE) Backtrace:
  [171809.988] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7fc8b9ccd848]
  [171809.988] (EE) 1: /usr/bin/X (0x7fc8b9b24000+0x1ad539) [0x7fc8b9cd1539]
  [171809.988] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fc8b8c20000+0x10340) [0x7fc8b8c30340]
  [171809.988] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (0x7fc8b763f000+0x97ff0) [0x7fc8b76d6ff0]
  [171809.988] (EE) 4: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0x5356) [0x7fc8b2964356]
  [171809.988] (EE) 5: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0x57fb) [0x7fc8b29647fb]
  [171809.988] (EE) 6: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0x7e22) [0x7fc8b2966e22]
  [171809.988] (EE) 7: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0x1186a) [0x7fc8b297086a]
  [171809.988] (EE) 8: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0xe236) [0x7fc8b296d236]
  [171809.988] (EE) 9: /usr/lib/xorg/modules/libexa.so (0x7fc8b295f000+0xc028) [0x7fc8b296b028]
  [171809.988] (EE) 10: /usr/bin/X (0x7fc8b9b24000+0x133f56) [0x7fc8b9c57f56]
  [171809.988] (EE) 11: /usr/bin/X (0x7fc8b9b24000+0x12a3fe) [0x7fc8b9c4e3fe]
  [171809.988] (EE) 12: /usr/bin/X (0x7fc8b9b24000+0x55f0e) [0x7fc8b9b79f0e]
  [171809.988] (EE) 13: /usr/bin/X (0x7fc8b9b24000+0x59d9a) [0x7fc8b9b7dd9a]
  [171809.988] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fc8b7660ec5]
  [171809.988] (EE) 15: /usr/bin/X (0x7fc8b9b24000+0x451ee) [0x7fc8b9b691ee]
  [171809.988] (EE) 
  [171809.988] (EE) Segmentation fault at address 0x0
  [171809.988] (EE) 
  Fatal server error:
  [171809.988] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [171809.988] (EE)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-71-generic 3.13.0-71.114
  ProcVersionSignature: Ubuntu 3.13.0-71.114-generic 3.13.11-ckt29
  Uname: Linux 3.13.0-71-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/pcmC1D7p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Dec 16 08:30:46 2015
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
  InstallationDate: Installed on 2015-10-17 (59 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
   eth0      no wireless extensions.
   eth1      no wireless extensions.
   lo        no wireless extensions.
  MachineType: Dell Inc. Precision Tower 7910
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-71-generic root=UUID=8fb5292d-6961-420e-ac9b-3f468520a7de ro plymouth:debug splash quiet drm.debug=0xe
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-3.13.0-71-generic N/A
   linux-backports-modules-3.13.0-71-generic  N/A
   linux-firmware                             1.127.19
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2015-11-02 (43 days ago)
  dmi.bios.date: 09/26/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0215PR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 7
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd09/26/2015:svnDellInc.:pnPrecisionTower7910:pvr:rvnDellInc.:rn0215PR:rvrA03:cvnDellInc.:ct7:cvr:
  dmi.product.name: Precision Tower 7910
  dmi.sys.vendor: Dell Inc.

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