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[Bug 1574612] Re: Random hangs


Serrie, the next step is to fully reverse commit bisect from kernel 4.2
to 4.6-rc6 in order to identify the last bad commit, followed
immediately by the first good one. Once this good commit has been
identified, it may be reviewed for backporting. Could you please do this

Please note, finding adjacent kernel versions is not fully commit

After the fix commit (not kernel version) has been identified, then
please mark this report Status Confirmed.

Thank you for your understanding.

Helpful bug reporting tips:

** Tags added: needs-reverse-bisect

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

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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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