[Pkg-xen-devel] Bug#573210: Bug#573210: Bug#573210: xen-hypervisor-3.2-1-amd64: Xen domU sometimes hogs CPU and doesn't respond

[Pasi Kärkkäinen]

On Thu, Mar 11, 2010 at 11:21:28PM +0200, Pasi Kärkkäinen wrote:
> On Tue, Mar 09, 2010 at 08:18:54PM +0100, Ondrej Kunc wrote:
> > Package: xen-hypervisor-3.2-1-amd64
> > Version: 3.2.1-2
> > Severity: normal
> >
> > *** Please type your report below this line ***
> > Hi,
> >
> > Recently I've experienced some crashes of Xen domU (also debian Lenny,  
> > running same kernel as dom0 (linux-image-2.6.26-xen-amd64)).
> > At xm top that domain appears as running, but hogs all CPUs, because  
> > this problem has appeared on two identic servers (Supermicro X7SBi, QC  
> > Xeon, 8G DDR II). I think that problem cannot be in hardware. We were  
> > running this configuration on some other servers with core2 duo  
> > processor (only dualcore) and there this problem never appeared. I've  
> > saved a core-dump of affected domU, but it's really big(1,1GB), so I'll  
> > not attach it to bugreport, but it is available for debugging.
> >
> > Thanks for potential interest in debugging.
> >
> 
> Hello,
> 
> It's this problem:
> http://moblog.wiredwings.com/index.php?url=archives/20090227/Lennys-Xen-Kernel-2.6.26-Causes-DomU-Freezes.html
> 
> I tried getting debug info (stack traces) of the crashed guest here:
> http://lists.xensource.com/archives/html/xen-devel/2010-03/msg00281.html
> 
> but it'd need more investigations and actual debugging..
> 

Btw the workaround should be to use only a single vcpu per each guest..
Having multiple vcpus for the domU running the 2.6.26-2-xen kernel causes problems.

-- Pasi