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

[PJ Welsh]

Comments at bottom:


On Tue, Mar 11, 2014 at 12:32 PM, Phillippe Welsh <pjwelsh at gmail.com> wrote:

> Comments inline:
>
> ----- Original Message -----
> > From: "Pasi Kärkkäinen" <pasik at iki.fi>
> > To: "Discussion about the virtualization on CentOS" <
> centos-virt at centos.org>
> > Sent: Sunday, March 9, 2014 4:32:13 AM
> > Subject: Re: [CentOS-virt] Fwd: Xen4CentOS kernel panic on dom0 reboot
> >
> > 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.
>
> I ran the "stop" for all of the xen related pieces in the order that the
> /etc/rc3.d/ had them.
> The VM's did not shutdown and the /usr/lib64/xen/bin/qemu-dm STUFF entries
> were left behind running.
> Since I could not xm shutdown any longer, I killed off all qemu-dm
> proccesses and attempted a reboot...
> HUNG on the reboot with the prepended umount error messages...
>
> >
> > >    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.
>
> Next reboot attempt included the "reboot=pci" grub.conf kernel option...
> No affect :(
> HUNG on the reboot with the prepended umount error messages...
>
> I ran out of time to attempt an xm shutdown for each VM manually, then
> reboot.
>
> What's interesting is that when I do an lsof on the file system that is
> unable to umount, the *only* connected PID's are the qemu-dm ones, but not
> *all* of them.???
>
> Thanks
>
> PJ
> ...
>

UPDATE: I cleanly shut down *all* vm's and unmounted the filesystem that
had the umount issue noted previously and then issued the reboot command.
*STILL* the Dell R710 will be hung at the rebooting line.

No reboot possible on 2 Dell R710's with at least the 2 most recent
CentOSXen4 kernels.

Any other suggestions?

Thanks

pjwelsh
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