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Re: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes

To: Tim M <bugs@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes new hypervisor's boot-time record
From: Keir Fraser <keir.xen@xxxxxxxxx>
Date: Wed, 13 Apr 2011 21:00:42 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes new hypervisor's boot-time record
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On 13/04/2011 20:31, "Tim M" <bugs@xxxxxxxxxxxxxx> wrote:

> Next I initiated a live migration and this is what the output of the command
> looks like (with commentary added):
> Wed Apr 13 12:07:48 PDT 2011
> Wed Apr 13 12:07:53 PDT 2011
> Wed Apr 13 12:07:58 PDT 2011
> Wed Apr 13 12:08:03 PDT 2011  [ migration happens here and SSH to the guest
> "freezes" for about 6 min ]
> Wed Apr 13 12:13:55 PDT 2011
> Wed Apr 13 12:14:00 PDT 2011
> Wed Apr 13 12:14:05 PDT 2011

Looks like the wallclock is correct after the migration however, and it's
that that the patch you referred to was fixing.

> I have only tried Ubuntu 10.04.2 guests running the 2.6.32 and 2.6.35 server
> kernel packages but, as mentioned, this happens every time.

I think this is a domU kernel bug, see a similar report here for example:
So it could be a common symptom in a range of Debian/Ubuntu kernels.

 -- Keir

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