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Reviewed:  https://review.opendev.org/c/openstack/neutron/+/808071
Committed: https://opendev.org/openstack/neutron/commit/b8ef8e722af761dd394064ab70e159aa05639e56
Submitter: "Zuul (22348)"
Branch:    master

commit b8ef8e722af761dd394064ab70e159aa05639e56
Author: Slawek Kaplonski <skaplons@xxxxxxxxxx>
Date:   Thu Sep 9 15:10:40 2021 +0200

    [Functional] Wait for the initial state of ha router before test
    
    In functional tests of the HA and DVR HA routers, when e.g.
    failover is tested, we should always wait for routers to be in the
    expected initial state (primary or backup) before router failover
    will actually be done.
    Without that, we may hit race condition when initial router's state
    is enqueued but not processed yet and then state will be changed thus
    no any action will be performed by L3 agent and test may fail.
    
    Closes-Bug: #1939507
    Change-Id: Ibd8f78fc822b04965c6a79b57b13be364934f64f


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

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https://bugs.launchpad.net/bugs/1939507

Title:
  Timeout while waiting for router HA state transition

Status in neutron:
  Fix Released

Bug description:
  It happens in functional tests, like e.g. in
  neutron.tests.functional.agent.l3.test_ha_router.L3HATestCase.test_ipv6_router_advts_and_fwd_after_router_state_change_backup:

  https://a1fab4006c6a1daf82f2-bd8cbc347d913753596edf9ef5797d55.ssl.cf1.rackcdn.com/786478/17/check/neutron-
  functional-with-uwsgi/7250dcf/testr_results.html

  
  Error is like:

  ft1.10: neutron.tests.functional.agent.l3.test_ha_router.L3HATestCase.test_ipv6_router_advts_and_fwd_after_router_state_change_backuptesttools.testresult.real._StringException: Traceback (most recent call last):
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/common/utils.py", line 702, in wait_until_true
      eventlet.sleep(sleep)
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-functional/lib/python3.8/site-packages/eventlet/greenthread.py", line 36, in sleep
      hub.switch()
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-functional/lib/python3.8/site-packages/eventlet/hubs/hub.py", line 313, in switch
      return self.greenlet.switch()
  eventlet.timeout.Timeout: 60 seconds

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/base.py", line 183, in func
      return f(self, *args, **kwargs)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/functional/agent/l3/test_ha_router.py", line 148, in test_ipv6_router_advts_and_fwd_after_router_state_change_backup
      self._test_ipv6_router_advts_and_fwd_helper('backup',
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/functional/agent/l3/test_ha_router.py", line 118, in _test_ipv6_router_advts_and_fwd_helper
      common_utils.wait_until_true(lambda: router.ha_state == 'backup')
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/common/utils.py", line 707, in wait_until_true
      raise WaitTimeout(_("Timed out after %d seconds") % timeout)
  neutron.common.utils.WaitTimeout: Timed out after 60 seconds

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