[Bug 1268906] Re: cpu soft lockup running kvm

[Gareth Woolridge]

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

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