Comment 4 for bug 1526657

Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
>>Its a new machine.
>>I located another machine with exact same hardware, ubuntu build and
drivers which is manifesting no problems: therefore this is a hardware bug
or at worst a bad interaction of OS with damaged hardware.

On 16 December 2015 at 19:27, Joseph Salisbury <
<email address hidden>> wrote:

> 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:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> 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
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1526657
>
> Title:
> desktop freeze, htop shows kernel thread at 100% cpu
>
> Status in linux package in Ubuntu:
> Incomplete
>
> 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
> DistributionChannelDescriptor:
> # This is a distribution channel descriptor
> # For more information see
> http://wiki.ubuntu.com/DistributionChannelDescriptor
> canonical-oem-somerville-precise-amd64-20130203-1
> InstallationDate: Installed on 2015-10-17 (59 days ago)
> InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary
> 20130203-13:50
> IwConfig:
> 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.
> RelatedPackageVersions:
> 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
> RfKill:
>
> 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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