A little different but hitting a failure in the same test here:

http://logs.openstack.org/77/59277/2/check/gate-tempest-dsvm-neutron-large-ops/4150461/console.html

This time it's a timeout:

2013-12-03 03:56:03.327 | Traceback (most recent call last):
2013-12-03 03:56:03.327 |   File "tempest/scenario/test_large_ops.py", line 105, in test_large_ops_scenario
2013-12-03 03:56:03.327 |     self.nova_boot()
2013-12-03 03:56:03.328 |   File "tempest/scenario/test_large_ops.py", line 98, in nova_boot
2013-12-03 03:56:03.328 |     self._wait_for_server_status('ACTIVE')
2013-12-03 03:56:03.328 |   File "tempest/scenario/test_large_ops.py", line 42, in _wait_for_server_status
2013-12-03 03:56:03.328 |     self.compute_client.servers, server.id, status)
2013-12-03 03:56:03.328 |   File "tempest/scenario/manager.py", line 304, in status_timeout
2013-12-03 03:56:03.328 |     not_found_exception=not_found_exception)
2013-12-03 03:56:03.329 |   File "tempest/scenario/manager.py", line 361, in _status_timeout
2013-12-03 03:56:03.329 |     raise exceptions.TimeoutException(message)
2013-12-03 03:56:03.329 | TimeoutException: Request timed out
2013-12-03 03:56:03.329 | Details: Timed out waiting for thing dbfa26dd-b91c-4061-96f2-7b05dbe8705d                       to become ACTIVE

I noticed that this merged around the same time, not sure if it had any impact:

https://review.openstack.org/#/c/56260/

I do see this in the n-api log around the time of the failure:

2013-12-03 03:56:02.844 INFO nova.api.openstack.wsgi [req-1a7878d0-5a88-48c9-b804-0acd1fc40162 demo demo] HTTP exception thrown: 404-{u'NeutronError': {u'message': u'Security group 2eebf16f-5578-4a48-92bd-f6b1aeaba6dd does not exist', u'type': u'SecurityGroupNotFound', u'detail': u''}}

And this is in the q-svc log around that same time:

2013-12-03 03:56:02.839 1301 ERROR neutron.api.v2.resource [req-228780c3-ceca-48e7-a5f8-1ca7bd357619 6edcc50ab776423d91db1138830921ca e24c6992e2f0408c920ba65ef6e567ed] show failed
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource Traceback (most recent call last):
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource   File "/opt/stack/new/neutron/neutron/api/v2/resource.py", line 84, in resource
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource     result = method(request=request, **args)
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource   File "/opt/stack/new/neutron/neutron/api/v2/base.py", line 296, in show
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource     parent_id=parent_id),
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource   File "/opt/stack/new/neutron/neutron/api/v2/base.py", line 264, in _item
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource     obj = obj_getter(request.context, id, **kwargs)
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource   File "/opt/stack/new/neutron/neutron/db/securitygroups_db.py", line 180, in get_security_group
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource     context, id), fields)
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource   File "/opt/stack/new/neutron/neutron/db/securitygroups_db.py", line 194, in _get_security_group
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource     raise ext_sg.SecurityGroupNotFound(id=id)
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource SecurityGroupNotFound: Security group 2eebf16f-5578-4a48-92bd-f6b1aeaba6dd does not exist
2013-12-03 03:56:02.839 1301 TRACE neutron.api.v2.resource