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[Slawek Kaplonski <1929523@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Test
tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_subnet_details
is failing with error like below:

Traceback (most recent call last):
  File "/opt/stack/tempest/tempest/common/utils/__init__.py", line 70, in wrapper
    return f(*func_args, **func_kwargs)
  File "/opt/stack/tempest/tempest/scenario/test_network_basic_ops.py", line 636, in test_subnet_details
    self.assertEqual(set(dns_servers), set(servers),
  File "/opt/stack/tempest/.tox/tempest/lib/python3.8/site-packages/testtools/testcase.py", line 415, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/opt/stack/tempest/.tox/tempest/lib/python3.8/site-packages/testtools/testcase.py", line 502, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: {'1.2.3.4'} != set(): Looking for servers: ['1.2.3.4']. Retrieved DNS nameservers: [] From host: 172.24.5.27.

Example of the failure:
https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_567/785895/1/gate
/neutron-tempest-slow-py3/567fc7f/testr_results.html

** Affects: neutron
     Importance: High
         Status: Confirmed


** Tags: gate-failure tempest

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https://bugs.launchpad.net/bugs/1929523

Title:
  Test
  tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_subnet_details
  is failing from time to time

Status in neutron:
  Confirmed

Bug description:
  Test
  tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_subnet_details
  is failing with error like below:

  Traceback (most recent call last):
    File "/opt/stack/tempest/tempest/common/utils/__init__.py", line 70, in wrapper
      return f(*func_args, **func_kwargs)
    File "/opt/stack/tempest/tempest/scenario/test_network_basic_ops.py", line 636, in test_subnet_details
      self.assertEqual(set(dns_servers), set(servers),
    File "/opt/stack/tempest/.tox/tempest/lib/python3.8/site-packages/testtools/testcase.py", line 415, in assertEqual
      self.assertThat(observed, matcher, message)
    File "/opt/stack/tempest/.tox/tempest/lib/python3.8/site-packages/testtools/testcase.py", line 502, in assertThat
      raise mismatch_error
  testtools.matchers._impl.MismatchError: {'1.2.3.4'} != set(): Looking for servers: ['1.2.3.4']. Retrieved DNS nameservers: [] From host: 172.24.5.27.

  Example of the failure:
  https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_567/785895/1/gate
  /neutron-tempest-slow-py3/567fc7f/testr_results.html

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