<div dir="ltr"><div>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.<br>
<br></div>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.<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Mar 7, 2014 at 10:43 PM, Pasi Kärkkäinen <span dir="ltr"><<a href="mailto:pasik@iki.fi" target="_blank">pasik@iki.fi</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On Thu, Mar 06, 2014 at 01:54:22PM -0600, Phillippe Welsh wrote:<br>
><br>
> Subject: Re: [CentOS-virt] Xen4CentOS kernel panic on dom0 reboot<br>
><br>
> On Wed, Mar 5, 2014 at 10:17 AM, David Vrabel <david.vrabel at <a href="http://citrix.com" target="_blank">citrix.com</a>>wrote:<br>
><br>
> > > On 05/03/14 15:09, Karl Johnson wrote:<br>
> > > > I've been using Xen4CentOS for the last 3 months. It's working fine and<br>
> > > > dom0/domUs are stable but the server does a kernel panic when doing a<br>
> > > > reboot and the server has to be hard reset manually. It has kernel panic<br>
> > > on the 3 last reboot.<br>
> > ><br>
> > > There is a xenbus device still present and during shutdown it is trying<br>
> > > to set it to CLOSED but at this point xenstored isn't running and the<br>
> > > xenbus write stalls.<br>
> > ><br>
> > > Do you have VMs that are still running when you attempt a reboot? If so<br>
> > > shutting them down will likely avoid this.<br>
> > ><br>
> > > Can you provide the output of xenstore-ls prior to attempting a reboot?<br>
> > ><br>
> > ><br>
> > ><br>
> > I though Xen init.d scripts would stop all of them before rebooting? Here's<br>
> > the output of chkconfig and xenstore-ls:<br>
> ><br>
> > <a href="http://pastebin.centos.org/8186/" target="_blank">http://pastebin.centos.org/8186/</a><br>
> ><br>
> > Thanks,<br>
> ><br>
> > Karl<br>
><br>
> 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-<a href="tel:3.10.25-11" value="+13102511">3.10.25-11</a>.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.<br>
><br>
> Any new suggestions?<br>
><br>
<br>
</div></div>So did you make sure all the VMs are shut down before trying to reboot dom0?<br>
<br>
-- Pasi<br>
<br>
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</blockquote></div><br></div>