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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => grizzly-rc1

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https://bugs.launchpad.net/bugs/1131023

Title:
  OSX unit tests intermittently fail due to coverage conflict

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Running unit tests with a high concurrency will lead to random test
  failures like the following:

  Traceback (most recent call last):
    File "nova/tests/test_libvirt.py", line 4153, in test_create_cow_image
      libvirt_utils.create_cow_image('/some/path', '/the/new/cow')
    File "nova/virt/libvirt/utils.py", line 174, in create_cow_image
      base_details = images.qemu_img_info(backing_file)
    File "/usr/local/lib/python2.7/site-packages/coverage/control.py", line 234, in _should_trace
      canonical = self.file_locator.canonical_filename(filename)
    File "/usr/local/lib/python2.7/site-packages/coverage/files.py", line 42, in canonical_filename
      if os.path.exists(f):
    File "/usr/local/lib/python2.7/site-packages/mox.py", line 765, in __call__
      return mock_method(*params, **named_params)
    File "/usr/local/lib/python2.7/site-packages/mox.py", line 1002, in __call__
      expected_method = self._VerifyMethodCall()
    File "/usr/local/lib/python2.7/site-packages/mox.py", line 1060, in _VerifyMethodCall
      raise UnexpectedMethodCallError(self, expected)
  UnexpectedMethodCallError: Unexpected method call.  unexpected:-  expected:+
  - exists.__call__('./nova/virt/images.py') -> None
  + exists.__call__('/some/path') -> True

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