test_wait_for_volume_attachment_not_present fails with StopIteration

[Lee Yarwood]

https://508bfdd6cb746245b8c8-09824a3c0d7e7424a39a97849bbb2f33.ssl.cf2.rackcdn.com/710040/4/check/openstack-tox-py36/e9ff1a1/testr_results.html

ft1.3: tempest.tests.common.test_waiters.TestVolumeWaiters.test_wait_for_volume_attachment_not_presenttesttools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/zuul/src/opendev.org/openstack/tempest/tempest/tests/common/test_waiters.py", line 385, in test_wait_for_volume_attachment_not_present
    uuids.attachment_id)
  File "/home/zuul/src/opendev.org/openstack/tempest/tempest/common/waiters.py", line 317, in wait_for_volume_attachment_remove
    'seconds', attachment_id, volume_id, time.time() - start)
  File "/usr/lib/python3.6/logging/__init__.py", line 1636, in info
    self.log(INFO, msg, *args, **kwargs)
  File "/usr/lib/python3.6/logging/__init__.py", line 1674, in log
    self.logger.log(level, msg, *args, **kwargs)
  File "/usr/lib/python3.6/logging/__init__.py", line 1374, in log
    self._log(level, msg, args, **kwargs)
  File "/usr/lib/python3.6/logging/__init__.py", line 1443, in _log
    exc_info, func, extra, sinfo)
  File "/usr/lib/python3.6/logging/__init__.py", line 1413, in makeRecord
    sinfo)
  File "/usr/lib/python3.6/logging/__init__.py", line 256, in __init__
    ct = time.time()
  File "/usr/lib/python3.6/unittest/mock.py", line 939, in __call__
    return _mock_self._mock_call(*args, **kwargs)
  File "/usr/lib/python3.6/unittest/mock.py", line 1001, in _mock_call
    result = next(effect)
StopIteration

[Martin Kopec (mkopec)]

yeah, it's happening very rarely, maybe it's just a random python issue. Let's keep this for a while to see if it's happening more often. I'm also gonna check the test if there is anything we can write differently to avoid an issue like this.

[Martin Kopec (mkopec)]

still happening, although the failure rate is just 0.63%
http://status.openstack.org/openstack-health/#/test/tempest.tests.common.test_waiters.TestVolumeWaiters.test_wait_for_volume_attachment_not_present?duration=P3M

[Martin Kopec (mkopec)]

No failures since the last comment, failure rate still at 0.63%. Let's mark this as Confirmed with a Low importance as this is happening very rarely and let's monitor it.