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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1301496

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1301496

Title:
  kernel crash: Unable to handle kernel paging request for data

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  We've seen this happen twice now on ppc64el guests that are probably
  under load.  I don't have a lot of the details on what was going on
  when they failed, but I have the stack traces.

  [101168.836780] Unable to handle kernel paging request for data at address 0x00010001
  [101168.836886] Faulting instruction address: 0xc000000000954b60
  [101168.836934] Oops: Kernel access of bad area, sig: 11 [#1]
  [101168.836971] SMP NR_CPUS=2048 NUMA pSeries
  [101168.837020] Modules linked in: veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables dm_crypt
  [101168.837234] CPU: 1 PID: 19760 Comm: kworker/u4:0 Not tainted 3.13.0-8-generic #28-Ubuntu
  [101168.837294] Workqueue: netns .cleanup_net
  [101168.837332] task: c0000003f99d43e0 ti: c0000001cce44000 task.ti: c0000001cce44000
  [101168.837386] NIP: c000000000954b60 LR: c000000000954b68 CTR: c000000000954b00
  [101168.837439] REGS: c0000001cce47760 TRAP: 0300   Not tainted  (3.13.0-8-generic)
  [101168.837493] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002024  XER: 00000000
  [101168.837620] CFAR: 000000001063ea4c DAR: 0000000000010001 DSISR: 40000000 SOFTE: 1
  GPR00: c000000000954b68 c0000001cce479e0 c0000000010b0dd0 0000000000010001
  GPR04: f0000000099918f0 c0000002be072380 c000000000954b68 c0000003fe023508
  GPR08: 0000000000010000 c000000209fc0000 000000000000000e 0000000000000001
  GPR12: 0000000044002028 c00000000fe80300 c0000000000c3f00 c0000002be1e8bc0
  GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  GPR20: 0000000000000000 0000000000000000 0000000000000001 c000000000f630fc
  GPR24: 0000000000000001 fffffffffffffef7 0000000000000000 c000000000f58638
  GPR28: 0000000000000001 c0000003fbdc0000 0000000000002000 0000000000000000
  [101168.838355] NIP [c000000000954b60] .tcp_net_metrics_exit+0x60/0x110
  [101168.838402] LR [c000000000954b68] .tcp_net_metrics_exit+0x68/0x110
  [101168.838448] Call Trace:
  [101168.838469] [c0000001cce479e0] [c000000000954b68] .tcp_net_metrics_exit+0x68/0x110 (unreliable)
  [101168.838542] [c0000001cce47a70] [c0000000008cc49c] .ops_exit_list.isra.2+0x6c/0xd0
  [101168.838605] [c0000001cce47b00] [c0000000008ccef0] .cleanup_net+0x150/0x250
  [101168.838662] [c0000001cce47bc0] [c0000000000b9e28] .process_one_work+0x1a8/0x4d0
  [101168.838726] [c0000001cce47c60] [c0000000000baaf0] .worker_thread+0x180/0x4a0
  [101168.838783] [c0000001cce47d30] [c0000000000c4010] .kthread+0x110/0x130
  [101168.838841] [c0000001cce47e30] [c00000000000a160] .ret_from_kernel_thread+0x5c/0x7c
  [101168.838903] Instruction dump:
  [101168.838940] 7d295030 2f890000 e93d0288 419e0058 3bc00000 3b800001 60000000 60420000
  [101168.839031] 7bc81f24 7c69402a 2fa30000 419e0024 <ebe30000> 4b8b809d 60000000 2fbf0000
  [101168.839127] ---[ end trace fb028b2b5c006a6a ]---
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14-0ubuntu1
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinux-3.13.0-19-generic root=UUID=19eaa2f9-0f24-49b9-ba48-24879242481c ro console=hvc0 earlyprintk
  ProcVersionSignature: User Name 3.13.0-19.40-generic 3.13.6
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty uec-images
  Uname: Linux 3.13.0-19-generic ppc64le
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video
  WifiSyslog:
   
  _MarkForUpload: True

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