Re: Fwd: Xen4CentOS kernel panic on dom0 reboot

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Anyone think it's related to microcode_ctl as noted in http://lists.us.dell.com/pipermail/linux-poweredge/2013-October/048538.html ?
I will see about testing for this issue ASAP...

pjwelsh


On Thu, Mar 13, 2014 at 6:58 PM, PJ Welsh <pjwelsh@xxxxxxxxx> wrote:
Comments at bottom:


On Tue, Mar 11, 2014 at 12:32 PM, Phillippe Welsh <pjwelsh@xxxxxxxxx> wrote:
Comments inline:

----- Original Message -----
> From: "Pasi Kärkkäinen" <pasik@xxxxxx>
> To: "Discussion about the virtualization on CentOS" <centos-virt@xxxxxxxxxx>
> Sent: Sunday, March 9, 2014 4:32:13 AM
> Subject: Re: 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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