We still need to see the vmCreate command used to learn more about the issue
We can always implement a hack that checks if the alias attribute exists. However, there is probably a deeper issue at hand and this is a good opportunity to find and solve it
Dan has a theory that the issue is with migrating a VM from a 3.0 VDSM version host to a 3.2 host. Perhaps the balloon device isn't created properly at the source host

From: "Dan Kenigsberg" <danken@redhat.com>
To: "Peter V. Saveliev" <peet@redhat.com>
Cc: vdsm-devel@lists.fedorahosted.org
Sent: Wednesday, May 29, 2013 4:41:24 PM
Subject: Re: [vdsm] Migration regression on master

On Wed, May 29, 2013 at 02:13:02PM +0200, Peter V. Saveliev wrote:
> On 05/29/2013 07:17 AM, Dan Kenigsberg wrote:
> >On Tue, May 28, 2013 at 11:54:45AM -0400, Giuseppe Vallarelli wrote:
> >> |

> >>| | From: "Assaf Muller" <amuller@redhat.com>
> >>| | To: "Michal Skrivanek" <michal.skrivanek@redhat.com>
> >>| | Cc: "vdsm-devel@lists.fedorahosted.org Development"
> >>| | <vdsm-devel@lists.fedorahosted.org>
> >>| | Sent: Thursday, May 23, 2013 2:12:47 PM
> >>| | Subject: Re: [vdsm] Migration regression on master
> >>| |
> >>| | As you can see in a previous patch set I checked if the alias attribute
> >>| | exists instead of assuming it exists.
> >>| | I then changed my mind with Dan's blessing, and decided to assume it does
> >>| | exist, exactly for cases like this.
> >>| | Even if we check if the alias exists, what do we do if we find out it
> >>| | doesn't? We're at a problem and need to understand why the alias doesn't
> >>| | exist because it should - For all devices.
> >>| |
> >>| | We definitely need to deal with this issue - Can you provide the domxml of
> >>| | the VM during creation, and during migration?
> >>
> >>Hi Assaf, Peter today has reproduced the same error and provided me
> >>the output log, you can find it here:
> >>http://etherpad.ovirt.org/p/migration-errors
> >
> >Would you add the original vmCreate line, and domxml, that was used to
> >create the VM at the source host?
>
> http://pastebin.test.redhat.com/144447
> http://pastebin.test.redhat.com/144446

That's an internal pastebin instance. Could you simply inline the
answer? Hyperlinks makes a casual reader of the mailing list not
understand what's going on.

Note that we need vmCreate command, the response is less
interesting, thow seeing the whole vdsm thread would not harm.

Dan.
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