I wonder whether this could be remotely related to bug #1265841. I don'T have
any proof there. Just stumbled over some used_math check (followed by potential
init_fpu) right at the beginning of kvm_arch_vcpu_ioctl_run. There was a longer
thread on LKML about that ("[PATCH] Make math_state_restore() save and restore
the interrupt flag").
Though in this case nothing is restored, and I don't see interrupts being
disabled. Also from the stack it seems we are usually later in that function.
So this more loud thinking and putting down notes, so I do not forget....
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Stefan Bader (smb)
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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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