Re: KVM guest lockup

Mark McLoughlin
2009-01-12T17:09:37Z

On Mon, 2008-12-22 at 11:57 +0100, Max Kellermann wrote:
> On 2008/12/21 12:55, Jan Niehusmann <jan@gondor.com> wrote:
> > As I observed such behaviour only when the host has frequency
> > scaling activated: Could it be that in this case,
> > clocksource_read(clock) on the guest is misbehaving?
>
> Indeed, the host had governor=ondemand. After the switch to
> "performance", the guest seems to run stable.
>
> So this is a bug in the guest kernel, by making wrong assumptions on
> the clock values retrieved from the host, right?

FWIW, several Fedora users are also seeing guest lockups with kvm-clock
in the guest and frequency scaling enabled in the host. See:

https://bugzilla.redhat.com/475598

Cheers,
Mark.