kernel-packages team mailing list archive

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

This looks to be drilling down to a problem which seems to only affect
i386 for some reason. But basically the kvm/qemu process gets into a
situation where the thread_info says "you have to reschedule" but the
per-cpu counterpart prevents that. Now the kvm/qemu process runs wildly
around between trying to run the guest vcpu which is not done because
the process side says reschedule and the cond_reschedule() function not
doing anything because the cpu info tells it otherwise.

Right now I got a test kernel back to run kvm but that is rather a vile
work-around. I have sent an email upstream in the hope that somebody
there has a better solution.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268906/+subscriptions