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[Bug 1574612] Re: Random hangs


Latest upstream kernel is running stable for 2 days straight. No hangs
and the kernel log is way cleaner, even though there are some i915
errors present. Attached the new kern.log if needed.

** Attachment added: "kern_upstream_4.6.0-rc6.log"

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  Random hangs

Status in linux package in Ubuntu:

Bug description:
  System hangs randomly. This mostly occurs anywhere between 15 minutes
  and a few hours after boot. Couldn't figure out the trigger. Happened
  while viewing YouTube, using Spotify switching to Eclipse etc. SSH
  still works, so I can get to the machine if the lockup occurs. That's
  how I submitted the bug. All screens freeze though, while audio keeps
  on working (like music from Spotify or sound from a YouTube video).
  The only thing that seems to keep working UI-wise is the mouse

  Had memtest running for half an hour without problems.

  The issue occurs multiple times a day. Issue doesn't seem to be
  triggered if I remove linux-image-4.2.0-35-generic and go back to
  linux-image-4.2.0-16-generic. Did use the linux-image-4.2.0-16-generic
  kernel for a few days without issues.

  The kern.log contains some stacktraces with the method being
  'schedule'. This is around the time the hang occurs.

  See extra debug information for more info.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
   /dev/snd/controlC1:  serrie     1815 F.... pulseaudio
   /dev/snd/pcmC0D0c:   serrie     1815 F...m pulseaudio
   /dev/snd/controlC0:  serrie     1815 F.... pulseaudio
  Date: Mon Apr 25 13:56:48 2016
  InstallationDate: Installed on 2016-04-12 (13 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
   docker0   no wireless extensions.
   enp4s0    no wireless extensions.
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=c15a8aa0-fb21-495c-bbc6-ea4f2018dc1f ro quiet splash vt.handoff=7
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2016-04-22 (3 days ago)
  dmi.bios.date: 01/27/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0505
  dmi.board.asset.tag: Default string
  dmi.board.name: B150M-A D3
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0505:bd01/27/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnB150M-AD3:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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