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Re: [Xen-users] Watchdog and live migration

On Thu, 2012-03-15 at 15:03 +0000, Wouter de Geus wrote:
> Hi folks,
> I have two machines running Xen, one has v4.1.1 and the other v4.1.2.
> On top I have a DRBD block device on which my test domU runs (Slackware v13.37
> using a kernel.org kernel version 3.2.6).
> The domU runs fine, but when I migrate it to the other dom0 something weird 
> happens:
> At first everything seems fine, the domain is gone on host 1 and runs on host 
> 2.
> (a ssh session to the domU survives and works fine as well), but after a 
> minute orso
> suddenly the domain is completely gone! (no corpse left on either dom0)
> The logs show a normal shutdown as far as I can tell, the only hint as to why 
> it 
> shut down is in 'xm dmesg' on the migration target dom0:
> (XEN) Watchdog timer fired for domain 19
> Does anyone know what is happenening here and why the migration triggers this?
> (and possible solutions)
> Is this a bug in Xen or did I do something stupid?
> In the domU a /dev/watchdog exists, but I never touch it myself.

Does your distro start a watchdogd for you?

Even if it did then it should obviously continue to poke the watchdog
even after a migration, but it might provide some hints.


> Thanks for reading :)
> Regards,
> Wouter.
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> http://lists.xen.org/xen-users

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