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Re: [Xen-users] domU crashes about a minute after migration

To: Carsten from Virtastic <carsten@xxxxxxxxxxxxx>
Subject: Re: [Xen-users] domU crashes about a minute after migration
From: Carsten from Virtastic <carsten@xxxxxxxxxxxxx>
Date: Tue, 26 Jul 2011 19:12:08 +0100
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Hi again,

> I've got a weird issue here, which I'm stuck with:
> When I migrate a domU (PV) from one server to another (both identical 
> hardware and software), it takes about 40-60 seconds after which the 
> successfully migrated domU simply crashes.

I can answer this myself now, in case anybody else runs into the same issue:

My guest-kernels had this set:


From my understanding this requires that /dev/watchdog be fed by a watchdog 
daemon in set intervals, and if that's not the case, the Hypervisor will 
terminate the guest.

Interestingly, this only seems to become relevant after migration, which 
doesn't quite make sense. The effect after creation or migration should be 

Anywho... setting this to CONFIG_XEN_WDT=n (or =m) resolves this problem. I can 
now happily migrate domU's back and forth, and they don't terminate any more.

(On an unrelated side note: I had to apply a blktap2 "cleanup" patch [1] to be 
able to migrate the domU back to the host where I migrated it off from, because 
otherwise remaining tapdisk2 processes would cause the migration to fail and 
the domU to crash.)

[1] http://marc.info/?l=xen-devel&m=131066210526755


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