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[Bug 2100776] [NEW] test_securitygroup(ovs-openflow) fullstack test random failure with Time out exception

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Public bug reported:

Fails as:-
ft1.2: neutron.tests.fullstack.test_securitygroup.TestSecurityGroupsSameNetwork.test_securitygroup(ovs-openflow)testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/base.py", line 178, in func
    return f(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 304, in test_securitygroup
    self._test_overlapping_mac_addresses()
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 657, in _test_overlapping_mac_addresses
    self.verify_connectivity_between_vms(
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 628, in verify_connectivity_between_vms
    self.assert_connection(
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 81, in assert_connection
    common_utils.wait_until_true(test_connectivity)
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/common/utils.py", line 730, in wait_until_true
    while not predicate():
              ^^^^^^^^^^^
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 76, in test_connectivity
    return netcat.test_connectivity()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 574, in test_connectivity
    self.client_process.writeline(testing_string)
  File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 348, in writeline
    self.stdin.flush()
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/greenio/py3.py", line 140, in write
    written = _original_os.write(self._fileno, view[offset:])
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/green/os.py", line 74, in write
    hubs.trampoline(fd, write=True)
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/__init__.py", line 159, in trampoline
    hub.remove(listener)
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/poll.py", line 29, in remove
    self.register(listener.fileno)
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/poll.py", line 31, in register
    def register(self, fileno, new=False):
    
  File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/fixtures/_fixtures/timeout.py", line 52, in signal_handler
    raise TimeoutException()
fixtures._fixtures.timeout.TimeoutException

Not seeing it quite often thoug, for now Seen twice in past weeks
https://d7dc64ccb2654383b602-73af3e7fb0ca2f6ff45efb1cdea09ef7.ssl.cf2.rackcdn.com/941459/1/gate/neutron-fullstack/50b4a4c/testr_results.html
https://227c79f6282be3c4ba5c-c685ac7d1fe5f5adbb4d0f30da5e685e.ssl.cf2.rackcdn.com/periodic/opendev.org/openstack/neutron/master/neutron-fullstack/ecd2d79/testr_results.html

This to track and fix the issue, kind of similar issue was seen in past
and fixed https://bugs.launchpad.net/neutron/+bug/1871908

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2100776

Title:
  test_securitygroup(ovs-openflow) fullstack test random failure with
  Time out exception

Status in neutron:
  New

Bug description:
  Fails as:-
  ft1.2: neutron.tests.fullstack.test_securitygroup.TestSecurityGroupsSameNetwork.test_securitygroup(ovs-openflow)testtools.testresult.real._StringException: Traceback (most recent call last):
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/base.py", line 178, in func
      return f(self, *args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 304, in test_securitygroup
      self._test_overlapping_mac_addresses()
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 657, in _test_overlapping_mac_addresses
      self.verify_connectivity_between_vms(
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 628, in verify_connectivity_between_vms
      self.assert_connection(
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 81, in assert_connection
      common_utils.wait_until_true(test_connectivity)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/common/utils.py", line 730, in wait_until_true
      while not predicate():
                ^^^^^^^^^^^
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/fullstack/test_securitygroup.py", line 76, in test_connectivity
      return netcat.test_connectivity()
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 574, in test_connectivity
      self.client_process.writeline(testing_string)
    File "/home/zuul/src/opendev.org/openstack/neutron/neutron/tests/common/net_helpers.py", line 348, in writeline
      self.stdin.flush()
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/greenio/py3.py", line 140, in write
      written = _original_os.write(self._fileno, view[offset:])
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/green/os.py", line 74, in write
      hubs.trampoline(fd, write=True)
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/__init__.py", line 159, in trampoline
      hub.remove(listener)
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/poll.py", line 29, in remove
      self.register(listener.fileno)
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/eventlet/hubs/poll.py", line 31, in register
      def register(self, fileno, new=False):
      
    File "/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/lib/python3.12/site-packages/fixtures/_fixtures/timeout.py", line 52, in signal_handler
      raise TimeoutException()
  fixtures._fixtures.timeout.TimeoutException

  Not seeing it quite often thoug, for now Seen twice in past weeks
  https://d7dc64ccb2654383b602-73af3e7fb0ca2f6ff45efb1cdea09ef7.ssl.cf2.rackcdn.com/941459/1/gate/neutron-fullstack/50b4a4c/testr_results.html
  https://227c79f6282be3c4ba5c-c685ac7d1fe5f5adbb4d0f30da5e685e.ssl.cf2.rackcdn.com/periodic/opendev.org/openstack/neutron/master/neutron-fullstack/ecd2d79/testr_results.html

  This to track and fix the issue, kind of similar issue was seen in
  past and fixed https://bugs.launchpad.net/neutron/+bug/1871908

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