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[John Schwarz <jschwarz@xxxxxxxxxx>]

Public bug reported:

Changeset [1] introduced a validation that the local_ip specified for
tunneling is actually used by one of the devices on the machine running
an OVS agent.

In Fullstack, multiple tests may run concurrently, which can cause a
race condition: suppose an ovs agent starts running as part of test A.
It retrieves the list of all devices on the host and starts a sequential
loop on them. In the mean time, some *other* fullstack test (test B)
completes and deletes the devices it created. The agent has that deleted
device in the list and when it will reach the device it will find out it
does not exist and crash.

[1]: https://review.openstack.org/#/c/154043/

** Affects: neutron
     Importance: Undecided
     Assignee: John Schwarz (jschwarz)
         Status: In Progress


** Tags: fullstack

** Changed in: neutron
     Assignee: (unassigned) => John Schwarz (jschwarz)

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https://bugs.launchpad.net/bugs/1506503

Title:
  OVS agents periodically fail to start in fullstack

Status in neutron:
  In Progress

Bug description:
  Changeset [1] introduced a validation that the local_ip specified for
  tunneling is actually used by one of the devices on the machine
  running an OVS agent.

  In Fullstack, multiple tests may run concurrently, which can cause a
  race condition: suppose an ovs agent starts running as part of test A.
  It retrieves the list of all devices on the host and starts a
  sequential loop on them. In the mean time, some *other* fullstack test
  (test B) completes and deletes the devices it created. The agent has
  that deleted device in the list and when it will reach the device it
  will find out it does not exist and crash.

  [1]: https://review.openstack.org/#/c/154043/

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