CentOS virt - Mar 2014 - Fwd: Xen4CentOS kernel panic on dom0 reboot

Subject: Re: [CentOS-virt] Xen4CentOS kernel panic on dom0 reboot

On Wed, Mar 5, 2014 at 10:17 AM, David Vrabel <david.vrabel at
citrix.com>wrote:
> > On 05/03/14 15:09, Karl Johnson wrote:
> > > I've been using Xen4CentOS for the last 3 months. It's
working fine and
> > > dom0/domUs are stable but the server does a kernel panic when
doing a
> > > reboot and the server has to be hard reset manually. It has
kernel panic
> > on the 3 last reboot.
> >
> > There is a xenbus device still present and during shutdown it is
trying
> > to set it to CLOSED but at this point xenstored isn't running and
the
> > xenbus write stalls.
> >
> > Do you have VMs that are still running when you attempt a reboot?  If
so
> > shutting them down will likely avoid this.
> >
> > Can you provide the output of xenstore-ls prior to attempting a
reboot?
> >
> >
> >
> I though Xen init.d scripts would stop all of them before rebooting?
Here's
> the output of chkconfig and xenstore-ls:
> 
> http://pastebin.centos.org/8186/
> 
> Thanks,
> 
> Karl
I've got the "me-too" on the reboot hang issue for 2 different
Dell R710's with xen-4.2.4-29.el6 and at least the kernels
kernel-3.10.25-11.el6.centos.alt.x86_64 and
kernel-3.10.23-11.el6.centos.alt.x86_64. I have not tried to reboot with the
latest kernel-3.10.32-11.el6.centos.alt.x86_64 (if kernel even makes a
difference). I *have* had dom0_mem=1024M,max:1024M option in place for all of
them with only 6 VM's.

Any new suggestions?

pjwelsh

On Thu, Mar 06, 2014 at 01:54:22PM -0600, Phillippe Welsh
wrote:
> 
> Subject: Re: [CentOS-virt] Xen4CentOS kernel panic on dom0 reboot
> 
> On Wed, Mar 5, 2014 at 10:17 AM, David Vrabel <david.vrabel at
citrix.com>wrote:
> 
> > > On 05/03/14 15:09, Karl Johnson wrote:
> > > > I've been using Xen4CentOS for the last 3 months.
It's working fine and
> > > > dom0/domUs are stable but the server does a kernel panic
when doing a
> > > > reboot and the server has to be hard reset manually. It has
kernel panic
> > > on the 3 last reboot.
> > >
> > > There is a xenbus device still present and during shutdown it is
trying
> > > to set it to CLOSED but at this point xenstored isn't running
and the
> > > xenbus write stalls.
> > >
> > > Do you have VMs that are still running when you attempt a reboot?
If so
> > > shutting them down will likely avoid this.
> > >
> > > Can you provide the output of xenstore-ls prior to attempting a
reboot?
> > >
> > >
> > >
> > I though Xen init.d scripts would stop all of them before rebooting?
Here's
> > the output of chkconfig and xenstore-ls:
> > 
> > http://pastebin.centos.org/8186/
> > 
> > Thanks,
> > 
> > Karl
> 
> I've got the "me-too" on the reboot hang issue for 2
different Dell R710's with xen-4.2.4-29.el6 and at least the kernels
kernel-3.10.25-11.el6.centos.alt.x86_64 and
kernel-3.10.23-11.el6.centos.alt.x86_64. I have not tried to reboot with the
latest kernel-3.10.32-11.el6.centos.alt.x86_64 (if kernel even makes a
difference). I *have* had dom0_mem=1024M,max:1024M option in place for all of
them with only 6 VM's.
> 
> Any new suggestions?
> 
So did you make sure all the VMs are shut down before trying to reboot dom0? 

-- Pasi