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

Hello,

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.


Please stand by while rebooting the system...
INFO: task reboot:19800 blocked for more than 120 seconds
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message
Call trace
...

Picture of the call trace: http://i59.tinypic.com/169olt1.png

CentOS: 6.5
Kernel: 3.10.23-11.el6.centos.alt.x86_64
Xen: 4.2.3
Server: Supermicro 6017R-WRF

Any idea how to troubleshoot or fix this issue? We can't reboot the dom0
during the week because domUs (2) are in production and this server is in a
datacenter.

Kind regards,

Karl
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On 05/03/14 15:09, Karl Johnson wrote:
> Hello,
> 
> 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?

David