Looks like libvirt was temporarily disconnected which caused the spawn failure:
http://logs.openstack.org/80/170780/11/gate/gate-tempest-dsvm-postgres-full/b2e3fd4/logs/screen-n-cpu.txt.gz?level=TRACE#_2015-05-04_16_49_01_948
2015-05-04 16:49:01.948 ERROR nova.compute.manager [req-e9676551-d3ed-4f85-ab2d-34ce9e1b1446 TestServerAdvancedOps-1668477466 TestServerAdvancedOps-559926363] [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] Instance failed to spawn
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] Traceback (most recent call last):
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/compute/manager.py", line 2475, in _build_resources
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] yield resources
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/compute/manager.py", line 2347, in _build_and_run_instance
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] block_device_info=block_device_info)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 2355, in spawn
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] block_device_info=block_device_info)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 4393, in _create_domain_and_network
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] power_on=power_on)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 4324, in _create_domain
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] LOG.error(err)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] six.reraise(self.type_, self.value, self.tb)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 4308, in _create_domain
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] domain = self._conn.defineXML(xml)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 183, in doit
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] result = proxy_call(self._autowrap, f, *args, **kwargs)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 141, in proxy_call
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] rv = execute(f, *args, **kwargs)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 122, in execute
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] six.reraise(c, e, tb)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 80, in tworker
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] rv = meth(*args, **kwargs)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] File "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 3263, in defineXML
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96] libvirtError: internal error: received hangup / error event on socket
2015-05-04 16:49:01.948 13039 TRACE nova.compute.manager [instance: 2d8249a5-df5a-4c8b-b41b-1c07f27ddb96]
http://logstash.openstack.org/#eyJzZWFyY2giOiJtZXNzYWdlOlwibGlidmlydEVycm9yOiBpbnRlcm5hbCBlcnJvcjogcmVjZWl2ZWQgaGFuZ3VwIC8gZXJyb3IgZXZlbnQgb24gc29ja2V0XCIgQU5EIHRhZ3M6XCJzY3JlZW4tbi1jcHUudHh0XCIiLCJmaWVsZHMiOltdLCJvZmZzZXQiOjAsInRpbWVmcmFtZSI6IjYwNDgwMCIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJ1c2VyX2ludGVydmFsIjowfSwic3RhbXAiOjE0MzA3NjA1MjQ5OTcsIm1vZGUiOiIiLCJhbmFseXplX2ZpZWxkIjoiIn0=
56 hits in 7 days, check and gate, all failures.
Looks like keep alive is timing out:
2015-05-04 16:49:01.912+0000: 5567: warning : virKeepAliveTim erInternal: 140 : No response from client 0x7f896af0d200 after 5 keepalive messages in 30 seconds