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Reviewed:  https://review.openstack.org/474063
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=2e7b787f0e60d3707fe4dec7f8acbc90cf62ea29
Submitter: Jenkins
Branch:    master

commit 2e7b787f0e60d3707fe4dec7f8acbc90cf62ea29
Author: Kevin Benton <kevin@xxxxxxxxxx>
Date:   Tue Jun 13 22:33:24 2017 -0700

    Retry ebtables lock acquisition failures
    
    It seems after the merge of
    https://bugs.launchpad.net/ubuntu/+source/ebtables/+bug/1645324
    that ebtables can fail to acquire a lock and bail with an error
    255. This adds some retry logic to retry it up to 10 times to
    work around this issue.
    
    Closes-Bug: #1697833
    Change-Id: Ic9dcf4b236a93e8811413c6ce2c4b82602544c6d


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1697833

Title:
  func: neutron.agent.linux.utils.ProcessExecutionError: Exit code: 255;
  Stdin: ; Stdout: ; Stderr: Unable to create lock file
  /run/ebtables.lock.

Status in neutron:
  Fix Released

Bug description:
  http://logs.openstack.org/21/473721/2/gate/gate-neutron-dsvm-
  functional-ubuntu-xenial/788a8a8/testr_results.html.gz

  neutron.tests.functional.agent.linux.test_linuxbridge_arp_protect.LinuxBridgeARPSpoofTestCase
  test_arp_correct_protection

  traceback-1: {{{
  Traceback (most recent call last):
    File "neutron/tests/functional/agent/linux/test_linuxbridge_arp_protect.py", line 44, in _ensure_rules_cleaned
      self.assertEqual([], rules, 'Test leaked ebtables rules')
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/testtools/testcase.py", line 411, in assertEqual
      self.assertThat(observed, matcher, message)
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/testtools/testcase.py", line 498, in assertThat
      raise mismatch_error
  testtools.matchers._impl.MismatchError: !=:
  reference = []
  actual    = [u'-i test-veth0d943e -j neutronMAC-test-veth0d943e',
   u'-i test-veth0d943e --among-src fa:16:3e:7f:c8:97, -j RETURN ',
   u'-p ARP --arp-ip-src 192.168.0.1 -j ACCEPT ']
  : Test leaked ebtables rules
  }}}

  Traceback (most recent call last):
    File "neutron/tests/base.py", line 118, in func
      return f(self, *args, **kwargs)
    File "neutron/tests/functional/agent/linux/test_linuxbridge_arp_protect.py", line 62, in test_arp_correct_protection
      self._add_arp_protection(self.source, [self.source.ip])
    File "neutron/tests/functional/agent/linux/test_linuxbridge_arp_protect.py", line 53, in _add_arp_protection
      arp_protect.setup_arp_spoofing_protection(name, port_dict)
    File "neutron/plugins/ml2/drivers/linuxbridge/agent/arp_protect.py", line 57, in setup_arp_spoofing_protection
      install_arp_spoofing_protection(vif, addresses, current_rules)
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
      return f(*args, **kwargs)
    File "neutron/plugins/ml2/drivers/linuxbridge/agent/arp_protect.py", line 114, in install_arp_spoofing_protection
      vif_chain, '-p', 'ARP'])
    File "neutron/plugins/ml2/drivers/linuxbridge/agent/arp_protect.py", line 194, in ebtables
      return execute(['ebtables', '--concurrent'] + comm, run_as_root=True)
    File "neutron/agent/linux/ip_lib.py", line 900, in execute
      log_fail_as_error=log_fail_as_error, **kwargs)
    File "neutron/agent/linux/utils.py", line 151, in execute
      raise ProcessExecutionError(msg, returncode=returncode)
  neutron.agent.linux.utils.ProcessExecutionError: Exit code: 255; Stdin: ; Stdout: ; Stderr: Unable to create lock file /run/ebtables.lock.

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