Intermittent py27 failure - TypeError: unsupported operand type(s

[Davanum Srinivas (DIMS)]

logstash shows 73 hits in last 48 hours:
http://logstash.openstack.org/#eyJzZWFyY2giOiJcIlR5cGVFcnJvcjogdW5zdXBwb3J0ZWQgb3BlcmFuZCB0eXBlKHMpIGZvciAtOiAnTm9uZVR5cGUnIGFuZCAnZGF0ZXRpbWUuZGF0ZXRpbWUnXCIiLCJmaWVsZHMiOltdLCJvZmZzZXQiOjAsInRpbWVmcmFtZSI6IjE3MjgwMCIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJ1c2VyX2ludGVydmFsIjowfSwic3RhbXAiOjE0Mzg5NDYyNDc4NzR9

Example from:
http://logs.openstack.org/19/188119/19/check/gate-nova-python27/65178aa/console.html

2015-08-07 11:09:23.483 | File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/bin/subunit-trace", line 11, in <module>
2015-08-07 11:09:23.484 | sys.exit(main())
2015-08-07 11:09:23.484 | File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/os_testr/subunit_trace.py", line 328, in main
2015-08-07 11:09:23.485 | print_summary(sys.stdout, elapsed_time)
2015-08-07 11:09:23.493 | File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/os_testr/subunit_trace.py", line 268, in print_summary
2015-08-07 11:09:23.493 | num, time = worker_stats(w)
2015-08-07 11:09:23.493 | File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/os_testr/subunit_trace.py", line 242, in worker_stats
2015-08-07 11:09:23.493 | delta = tests[-1]['timestamps'][1] - tests[0]['timestamps'][0]
2015-08-07 11:09:23.494 | TypeError: unsupported operand type(s) for -: 'NoneType' and 'datetime.datetime'

[Davanum Srinivas (DIMS) (dims-v)]

Looks like this is fixed in os-testr master and we just need a release

[Matthew Treinish (treinish)]

The os-testr stacktrace is fixed by: http://git.openstack.org/cgit/openstack/os-testr/commit/?id=2ea7c8837bae482bd4a3cc37025baa7e2f456a54