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

[Pasi Kärkkäinen]

On Sat, Mar 08, 2014 at 09:09:07AM -0600, PJ Welsh wrote:
>    No, I have not followed those instructions yet. These were production
>    servers that I had scheduled firmware updates late Sunday evening. The
>    first time I though the error was a fluke and only began to research it
>    after the second failure (and still no firmware updates due to the
>    power-cycle). I may try to sneak in a restart of one of the systems late
>    Sunday night US CT.
> 

OK.

>    Still not sure why the running vm's would stop the reboot... The server
>    shows that it was suppose to be restarting. I have had a similar stuck on
>    restarting message (minus all the umount errors) on some Dell T105's
>    running CentOS 6.5 and the "reboot=pci" grub.conf kernel option is what
>    ended up working for them. I have not tested that possible option yet,
>    either since that would take 2 reboots to put into place.
> 

Yeah, it's worth testing both, to figure out what's wrong.


-- Pasi

>    On Fri, Mar 7, 2014 at 10:43 PM, Pasi Kärkkäinen <[1]pasik at iki.fi> wrote:
> 
>      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
>      [2]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:
>      > >
>      > > [3]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-[4]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
> 
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> 
> References
> 
>    Visible links
>    1. mailto:pasik at iki.fi
>    2. http://citrix.com/
>    3. http://pastebin.centos.org/8186/
>    4. file:///tmp/tel:3.10.25-11
>    5. mailto:CentOS-virt at centos.org
>    6. http://lists.centos.org/mailman/listinfo/centos-virt

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