Comment 2 for bug 1576185

Looks like nova-compute missed neutron-server notification about port binding.

Spawning:

2016-04-28 11:14:05.336 3707 INFO nova.virt.libvirt.driver Creating image
2016-04-28 11:14:11.124 3707 INFO nova.compute.manager VM Started (Lifecycle Event)
2016-04-28 11:14:11.181 3707 INFO nova.compute.manager VM Paused (Lifecycle Event)
2016-04-28 11:14:11.277 3707 INFO nova.compute.manager During sync_power_state the instance has a pending task (spawning). Skip.

Here we're waiting for portbinding and neutron does it perfectly:

2016-04-28 11:14:12.332 23427 INFO neutron.notifiers.nova [-] Nova event response: {u'status': u'completed', u'tag': u'ec35f707-7e9e-4d93-850c-de765411f5f1', u'name': u'network-vif-plugged', u'server_uuid': u'aa1af326-ff02-471c-a546-a4efdc871f63', u'code': 200}
2016-04-28 11:14:12.459 23438 INFO neutron.notifiers.nova [-] Nova event response: {u'status': u'completed', u'tag': u'2be1b1be-f700-49da-b150-b82a3ae983cd', u'name': u'network-vif-plugged', u'server_uuid': u'aa1af326-ff02-471c-a546-a4efdc871f63', u'code': 200}
2016-04-28 11:15:22.997 23375 INFO neutron.notifiers.nova [-] Nova event response: {u'status': u'completed', u'tag': u'ec35f707-7e9e-4d93-850c-de765411f5f1', u'name': u'network-vif-plugged', u'server_uuid': u'aa1af326-ff02-471c-a546-a4efdc871f63', u'code': 200}

2016-04-28 11:14:12.313 14444 INFO nova.api.openstack.compute.server_external_events Creating event network-vif-plugged:ec35f707-7e9e-4d93-850c-de765411f5f1 for instance aa1af326-ff02-471c-a546-a4efdc871f63
2016-04-28 11:14:12.451 14467 INFO nova.api.openstack.compute.server_external_events Creating event network-vif-plugged:2be1b1be-f700-49da-b150-b82a3ae983cd for instance aa1af326-ff02-471c-a546-a4efdc871f63
2016-04-28 11:15:22.989 14467 INFO nova.api.openstack.compute.server_external_events Creating event network-vif-plugged:ec35f707-7e9e-4d93-850c-de765411f5f1 for instance aa1af326-ff02-471c-a546-a4efdc871f63

But actually nova-compute didn't get it and raise a timeout in nova.virt.libvirt.driver.LibvirtDriver#_create_domain_and_network:

2016-04-28 11:19:11.124 3707 WARNING nova.virt.libvirt.driver [req-6e606db9-d0cf-4ea5-82aa-8bdb4d7ed63d ff83fb6171cf411db4a05126c9663ccf 2161feb2f5c5425f815e468f30894f4b - - -] [instance: aa1af326-ff02-471c-a546-a4efdc871f63] Timeout waiting for vif plugging callback for instance aa1af326-ff02-471c-a546-a4efdc871f63