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[Tamas Papp <1278591@xxxxxxxxxxxxxxxxxx>]

Not really, this was the second case I encountered it in a very long time.
My guess is that it could be reproduced in reasonable time with moderate network traffic and a bunch of lxc-start/stop. After a while it should happen.

Anyway reading the commit message it's very probable, that this commit
will fix this issue.

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https://bugs.launchpad.net/bugs/1278591

Title:
  kernel hard lock on lxc-stop

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Trusty:
  Confirmed

Bug description:
  Server crashed during lxc-stop.

  I don't have crashdump, only an ipmi console screenshot with half of
  the oops message.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.25
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Feb  8 22:59 seq
   crw-rw---- 1 root audio 116, 33 Feb  8 22:59 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.12.5-0ubuntu2.2
  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: Mon Feb 10 22:39:29 2014
  HibernationDevice: RESUME=UUID=6b896e04-76d0-4836-ad53-8f7cd97954ad
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Supermicro X9DR3-F
  MarkForUpload: True
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=8b2c03eb-f52f-471d-8816-40a69e4e2a01 ro
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/31/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.0a
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X9DR3-F
  dmi.board.vendor: Supermicro
  dmi.board.version: 0123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd07/31/2013:svnSupermicro:pnX9DR3-F:pvr0123456789:rvnSupermicro:rnX9DR3-F:rvr0123456789:cvnSupermicro:ct3:cvr0123456789:
  dmi.product.name: X9DR3-F
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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