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["Sean M. Collins" <sean_collins2@xxxxxxxxxxxxxxxxx>]

Public bug reported:

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/

** Affects: nova
     Importance: Undecided
         Status: New

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

Title:
  Utils.is_neutron can create race conditions

Status in OpenStack Compute (Nova):
  New

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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