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[Gareth Woolridge <gareth.woolridge@xxxxxxxxxxxxx>]

I've had a number of lockups in the last 2 days since upgrading to
Trusty and trying to run a VM under kvm which look to match this issue.

System appears to become unresponsive/hang with what looks like some
kind of I/O lockup, cannot ls in a terminal etc before eventually
display freezes.  syslog shows kernel spew related to soft lockup after
this point though.

The issue appeared to coincide with a period of high disk I/O within the
guest on both occasions.  I'll look to reproduce on a less active guest
outside of working day.

This occured on a 64 bit system:

lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu Trusty Tahr (development branch)
Release:	14.04
Codename:	trusty

uname -a
Linux moon127-pcsubu 3.13.0-12-generic #32-Ubuntu SMP Fri Feb 21 17:45:10 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


** Attachment added: "syslog/kernel log of lockup"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+attachment/3999385/+files/soft-lockup-syslog.txt

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https://bugs.launchpad.net/bugs/1268906

Title:
  cpu soft lockup running kvm

Status in “linux” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  Ran twice - first time running kvm killed my system. The second time,
  I just got lots of kernel oops messages in dmesg.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-2-generic 3.13.0-2.17
  ProcVersionSignature: Ubuntu 3.13.0-2.17-generic 3.13.0-rc7
  Uname: Linux 3.13.0-2-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  james      3250 F.... pulseaudio
   /dev/snd/controlC0:  james      3250 F.... pulseaudio
   /dev/snd/pcmC0D0p:   james      3250 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 14 10:29:20 2014
  HibernationDevice: RESUME=UUID=67e3cd44-242b-4bbf-918b-28fff81e0312
  InstallationDate: Installed on 2010-10-21 (1181 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: LENOVO 2516CTO
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-2-generic root=UUID=7ad192e9-7b26-49d1-8e1c-fefc7dc495cb ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-2-generic N/A
   linux-backports-modules-3.13.0-2-generic  N/A
   linux-firmware                            1.121
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-11-01 (73 days ago)
  dmi.bios.date: 08/27/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6IET72WW (1.32 )
  dmi.board.name: 2516CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6IET72WW(1.32):bd08/27/2010:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2516CTO
  dmi.product.version: ThinkPad T410
  dmi.sys.vendor: LENOVO

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