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

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

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https://bugs.launchpad.net/bugs/1274992

Title:
  Utils.is_neutron can create race conditions

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  It appears that using the utils.is_neutron() function can create race
  conditions, if not used carefully. Review #56381 was attempting to
  check the presence of Neutron, in order to determine if hairpinning
  should be enabled on the bridge that Nova creates. Only after creating
  a new configuration flag in Nova.conf and checking the setting, were
  the unit tests passing and the race condition resolved.

  My hunch is that the global variable that utils.is_neutron( ) creates
  is the root cause of the issue.

  https://review.openstack.org/#/c/56381/

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