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[Nate Johnston <1829890@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I have started seeing failures in the neutron-functional jobs.  The
issue is in
neutron.tests.functional.agent.linux.test_bridge_lib.FdbInterfaceTestCase
the tests "test_append(no_namespace)" and
"test_add_delete_dst(no_namespace)".  Those tests fail a percentage of
the time with the error
"neutron.privileged.agent.linux.ip_lib.InterfaceAlreadyExists: Interface
interface already exists."

This typically is also accompanied by a failure in
"test_replace(no_namespace)" in the same module, which reports the
error: "neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound:
Network interface int_vxlan not found in namespace None.".

I checked Logstash [1] and it looks like we have hit this 11 times over
the past 7 days on 5 different changes.

[1]
http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Interface%20interface%20already%20exists%5C%22

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: gate-failure

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https://bugs.launchpad.net/bugs/1829890

Title:
  neutron-functional CI job fails with InterfaceAlreadyExists error

Status in neutron:
  New

Bug description:
  I have started seeing failures in the neutron-functional jobs.  The
  issue is in
  neutron.tests.functional.agent.linux.test_bridge_lib.FdbInterfaceTestCase
  the tests "test_append(no_namespace)" and
  "test_add_delete_dst(no_namespace)".  Those tests fail a percentage of
  the time with the error
  "neutron.privileged.agent.linux.ip_lib.InterfaceAlreadyExists:
  Interface interface already exists."

  This typically is also accompanied by a failure in
  "test_replace(no_namespace)" in the same module, which reports the
  error:
  "neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound:
  Network interface int_vxlan not found in namespace None.".

  I checked Logstash [1] and it looks like we have hit this 11 times
  over the past 7 days on 5 different changes.

  [1]
  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Interface%20interface%20already%20exists%5C%22

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