[CentOS-virt] reboot guest on panic
ngaywood at une.edu.au
Sun Mar 14 23:42:34 UTC 2010
On Sun, Mar 14, 2010 at 05:06:32PM -0400, Dan Hrabarchuk wrote:
> Try this in the guest:
> echo "1" > /proc/sys/kernel/panic_on_oops
This might be a bit too much. There is another "harmless" oops that occasionally
happens related to ext4 quotas. I wouldn't want it to reboot on those.
The hung_task_panic=1 does in fact cause the panic when I want it.
However the problem seems to be that it does not reboot after the panic.
> echo "5" > /proc/sys/kernel/panic
I already have this, although I have a value of 15.
> On 03/13/2010 05:03 PM, Norman Gaywood wrote:
> > I have a guest that keeps crashing and want to automatically reboot it
> > when it crashes. See:
> > xen PV guest kernel 2.6.32 processes lock up in D state
> > https://bugzilla.redhat.com/show_bug.cgi?id=550724
> > if you want to look at the details on the crashing.
> > Anyway, I boot the guest with the kernel command line parameter:
> > hung_task_panic=1
> > I have kernel.panic = 15 in the guest /etc/sysctl.conf
> > In the guest config file in dom0 I have:
> > on_poweroff = "destroy"
> > on_reboot = "restart"
> > on_crash = "restart"
> > The guest manages to panic when it detects the hung tasks and I get this
> > on the guest console:
> > Kernel panic - not syncing: hung_task: blocked tasks
> > Rebooting in 15 seconds..
> > However, it never restarts. It just hangs around until I do a
> > xm destroy<guest>
> > xm create<guest>
> > Have I missed something?
Norman Gaywood, Computer Systems Officer
University of New England, Armidale, NSW 2351, Australia
ngaywood at une.edu.au Phone: +61 (0)2 6773 3337
http://mcs.une.edu.au/~norm Fax: +61 (0)2 6773 3312
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