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[Yair Fried <yfried@xxxxxxxxxx>]

IMO this is actually a Neutron bug and Tempest reveals a race.
We should add a waiter for the update to verify it's really a race.

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1412325

Title:
  test_subnet_details failed due to MismatchError

Status in OpenStack Neutron (virtual network service):
  New
Status in Tempest:
  In Progress

Bug description:
  A new test test_subnet_details failed on the gate for Nova like the
  following:

  http://logs.openstack.org/92/144092/3/check/check-tempest-dsvm-
  neutron-full/6bcefe8/logs/testr_results.html.gz

  Traceback (most recent call last):
    File "tempest/test.py", line 112, in wrapper
      return f(self, *func_args, **func_kwargs)
    File "tempest/scenario/test_network_basic_ops.py", line 486, in test_subnet_details
      self._check_dns_server(ssh_client, [alt_dns_server])
    File "tempest/scenario/test_network_basic_ops.py", line 437, in _check_dns_server
      trgt_serv=dns_servers))
    File "/usr/local/lib/python2.7/dist-packages/testtools/testcase.py", line 348, in assertEqual
      self.assertThat(observed, matcher, message)
    File "/usr/local/lib/python2.7/dist-packages/testtools/testcase.py", line 433, in assertThat
      raise mismatch_error
  MismatchError: set(['9.8.7.6']) != set(['1.2.3.4']): Looking for servers: ['9.8.7.6']. Retrieved DNS nameservers: ['1.2.3.4'] From host: 172.24.4.98.

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