[CentOS-virt] BUG: soft lockup detected on CPU#?

Tue Jan 22 22:23:54 UTC 2008
Brett Worth <brett at worth.id.au>

Ross S. W. Walker wrote:
> After seeing this same issue on my Xen 3.2 install, but with NO
> migration or iSCSI happening I decided it is probably NOT iSCSI's
> fault, so I decided to research it a little more and this is what
> I found:
> http://docs.xensource.com/XenServer/4.0.1/guest/ch04s08.html#rhel5_limitations
Thanks Ross.  I'll do more research into this when I get back to work.

The Release Notes say:

"Soft lockup messages after suspend/resume or live migration (Red Hat
Bugzilla 250994
<https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=250994>). These
messages are harmless, but there may be a period of inactivity in the
guest during live migration as a result of the lockup."

This seems to imply that the delay during the live migration is causing
the messages.  In my case the messages persist forever long after the
migration.  I might take a look at the patched kernel and see it there's
a specific fix that could be applied to a more recent kernel.