[Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools.

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Jul 15, 2011 at 02:30:09PM +0000, andrewpitman@xxxxxxxxxxx wrote:
>    Hi all!
> 
>    I've been trying to make use of the credit2 scheduler for my guests
>    running real-time (audio) applications, and to facilitate this I'm using
>    cpupools to separate Domain-0 and less time critical guests which run fine
>    under the regular credit scheduler, and the others which need to use
>    credit2.  However, I seem to be able to reliably crash the hypervisor when
>    I try to move virtual cpus (hyperthreads) or domains between cpupools.
>    Sometimes it even crashes when I simply try to set the credit2 scheduler
>    weight for a domain.  All domains are fully virtualized and running CentOS
>    5.  Dom-0 is running Fedora 13 with pvops 2.6.32.40 kernel.
> 
>    The panic message displays a register dump and stack trace, as well as:
>    (XEN) Panic on CPU 0:
>    (XEN) Xen BUG at sched_credit.c:991
> 
>    Hardware is a Dell R810 server with one 10-core Xeon E7, 128 GB RAM and
>    the guests reside on NAS storage.
> 
>    If I simply use Pool-0 for everything and set the default scheduler to
>    credit2 in the Xen boot string everything runs fine, but this workaround
>    is not ideal since it removes some flexibility for me.
> 
>    Any ideas where I should look to determine how to resolve this?
> 

(Added xen-devel to CC).

Can you please post the exact steps to reproduce the hypervisor crash?

-- Pasi


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