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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1261596

Title:
  System crash at thread_group_cputime_adjusted

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  We have been experiencing intermittent system crashes on an Ubuntu
  13.10 server.  Loading the crash dump gives the following information:

        KERNEL: /usr/lib/debug/boot/vmlinux-3.11.0-14-generic
      DUMPFILE: dump.201312170006  [PARTIAL DUMP]
          CPUS: 24
          DATE: Tue Dec 17 00:05:33 2013
        UPTIME: 00:00:16
  LOAD AVERAGE: 0.14, 0.03, 0.01
         TASKS: 768
      NODENAME: zagros
       RELEASE: 3.11.0-14-generic
       VERSION: #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013
       MACHINE: x86_64  (2294 Mhz)
        MEMORY: 63.9 GB
         PANIC: ""
           PID: 2245
       COMMAND: "monit"
          TASK: ffff880fdf678000  [THREAD_INFO: ffff880fe02f6000]
           CPU: 20
         STATE: TASK_RUNNING (PANIC)

  The bt for the crash is:

  crash> bt
  PID: 2245   TASK: ffff880fdf678000  CPU: 20  COMMAND: "monit"
   #0 [ffff880fe02f79a8] machine_kexec at ffffffff81048322
   #1 [ffff880fe02f79f8] crash_kexec at ffffffff810d03f3
   #2 [ffff880fe02f7ac0] oops_end at ffffffff816edf58
   #3 [ffff880fe02f7ae8] die at ffffffff8101616b
   #4 [ffff880fe02f7b18] do_trap at ffffffff816ed770
   #5 [ffff880fe02f7b68] do_divide_error at ffffffff81013262
   #6 [ffff880fe02f7c10] divide_error at ffffffff816f6e8e
      [exception RIP: cputime_adjust+240]
      RIP: ffffffff81097790  RSP: ffff880fe02f7cc8  RFLAGS: 00010887
      RAX: b713d5ba06800000  RBX: 000000000977ccee  RCX: ffff880fe02f7df8
      RDX: 0000000000000000  RSI: ffff880fdf34ac50  RDI: 0000000000000000
      RBP: ffff880fe02f7cd8   R8: 00000000fff5fb80   R9: 000000000045405f
      R10: fff5fb800d780978  R11: 0000000000000000  R12: ffff880fe02f7df0
      R13: ffff880fe02f7df8  R14: 0000000000000001  R15: ffff880fdf34aa80
      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
   #7 [ffff880fe02f7ce0] thread_group_cputime_adjusted at ffffffff8109839e
   #8 [ffff880fe02f7d20] do_task_stat at ffffffff8120f92b
   #9 [ffff880fe02f7e58] proc_tgid_stat at ffffffff812104c4
  #10 [ffff880fe02f7e68] proc_single_show at ffffffff8120b40d
  #11 [ffff880fe02f7ea0] seq_read at ffffffff811c965e
  #12 [ffff880fe02f7f08] vfs_read at ffffffff811a6bee
  #13 [ffff880fe02f7f40] sys_read at ffffffff811a7719
  #14 [ffff880fe02f7f80] system_call_fastpath at ffffffff816f571d
      RIP: 00007f700b671c80  RSP: 00007fff7f7b83c8  RFLAGS: 00000246
      RAX: 0000000000000000  RBX: ffffffff816f571d  RCX: ffffffffffffffff
      RDX: 00000000000003ff  RSI: 00007fff7f7b86f0  RDI: 0000000000000005
      RBP: 00007fff7f7b86f0   R8: 00007f700ade7fe0   R9: 00007f700aa76134
      R10: 0000000000000004  R11: 0000000000000246  R12: 00000000000003ff
      R13: 0000000000000000  R14: 00007fff7f7b83e0  R15: 0000000000000005
      ORIG_RAX: 0000000000000000  CS: 0033  SS: 002b

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-14-generic 3.11.0-14.21
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 17 01:23 seq
   crw-rw---- 1 root audio 116, 33 Dec 17 01:23 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Tue Dec 17 01:25:47 2013
  HibernationDevice: RESUME=/dev/mapper/zagros--vg-swap_1
  InstallationDate: Installed on 2013-11-14 (32 days ago)
  InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64 (20131016)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Intel Corporation S2600GZ
  MarkForUpload: True
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-14-generic root=/dev/mapper/hostname--vg-root ro --no-log crashkernel=384M-2G:64M,2G-:768M quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 08/22/2013
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: SE5C600.86B.02.01.0002.082220131453
  dmi.board.asset.tag: ....................
  dmi.board.name: S2600GZ
  dmi.board.vendor: Intel Corporation
  dmi.board.version: G29051-353
  dmi.chassis.asset.tag: ....................
  dmi.chassis.type: 23
  dmi.chassis.vendor: ...............................
  dmi.chassis.version: ..................
  dmi.modalias: dmi:bvnIntelCorp.:bvrSE5C600.86B.02.01.0002.082220131453:bd08/22/2013:svnIntelCorporation:pnS2600GZ:pvr....................:rvnIntelCorporation:rnS2600GZ:rvrG29051-353:cvn...............................:ct23:cvr..................:
  dmi.product.name: S2600GZ
  dmi.product.version: ....................
  dmi.sys.vendor: Intel Corporation

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