Re: kvm linux guest hanging for minutes at a time

Avi Kivity
2011-08-09T14:37:13Z

On 08/09/2011 05:31 PM, Thomas Fjellstrom wrote:
> On August 9, 2011, Avi Kivity wrote:
> > On 08/09/2011 03:03 PM, Thomas Fjellstrom wrote:
> > > > Your guest isn't using kvmclock for some reason. Is it compiled in
> > > > the guest kernel? What are the contents of
> > > > /sys/devices/system/clocksource/clocksource0/available_clocksource and
> > > > /sys/devices/system/clocksource/clocksource0/current_clocksource (in
> > > > the guest filesystem)?
> > >
> > > Hi, it seems it is using kvm-clock:
> > >
> > > $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> > > kvm-clock hpet acpi_pm
> > > $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> > > kvm-clock
> >
> > Yikes. Please trace such a hang according to
> > http://www.linux-kvm.org/page/Tracing.
>
> Does it matter that I have several vms running? Is there a way to limit it to
> tracing the single kvm process that's been locking up?
>

You can use "trace-cmd record -F ... qemu ..." but that misses out on
events the run from workqueues.

Best to stop those other guests.

--
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