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[Xen-devel] Xend transaction reduction breaks migration

  • To: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Wed, 14 Nov 2007 23:44:42 +0000
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 14 Nov 2007 15:45:39 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcgnGFPgkol3BpMLEdyQgQAX8io7RQ==
  • Thread-topic: Xend transaction reduction breaks migration

Hey Daniel,

It turns out that your changeset 16260 in xen-unstable breaks our localhost
non-live migration tests. What happens is that randomly (but fairly often)
xend will throw an assertion at line 'assert console_port' in
XendCheckpoint.py. This is in the domain_restore_fd context, so result is
that the restorer dies and then of course the saver fails soon after since
the migration socket goes away.

Any idea how your patch could cause this rather bizarre behaviour? I haven't
worked it out myself, though I'm 99% sure it *is* that changeset that has
caused this regression (based on tests with the changeset reverted).

It's currently the only blocker in our automated tests on the staging tree,
and blocks pushing to the main xen-unstable tree. :-)


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