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[Lajos Katona <1744402@xxxxxxxxxxxxxxxxxx>]

Since https://review.opendev.org/c/openstack/neutron/+/830374
fullstack's unstable decorator is removed from test_security_groups .
(that is ~unmaintained/yoga at least since the tag is removed)

** Changed in: neutron
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1744402

Title:
  fullstack security groups test fails because ncat process don't starts

Status in neutron:
  Fix Released

Bug description:
  Sometimes fullstack test
  neutron.tests.fullstack.test_securitygroup.TestSecurityGroupsSameNetwork
  fails because "ncat" process don't starts properly:

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "neutron/tests/base.py", line 132, in func
          return f(self, *args, **kwargs)
        File "neutron/tests/fullstack/test_securitygroup.py", line 163, in test_securitygroup
          net_helpers.NetcatTester.TCP)
        File "neutron/tests/fullstack/test_securitygroup.py", line 68, in assert_connection
          self.assertTrue(netcat.test_connectivity())
        File "neutron/tests/common/net_helpers.py", line 509, in test_connectivity
          self.client_process.writeline(testing_string)
        File "neutron/tests/common/net_helpers.py", line 459, in client_process
          self.establish_connection()
        File "neutron/tests/common/net_helpers.py", line 489, in establish_connection
          address=self.address)
        File "neutron/tests/common/net_helpers.py", line 537, in _spawn_nc_in_namespace
          proc = RootHelperProcess(cmd, namespace=namespace)
        File "neutron/tests/common/net_helpers.py", line 288, in __init__
          self._wait_for_child_process()
        File "neutron/tests/common/net_helpers.py", line 321, in _wait_for_child_process
          "in %d seconds" % (self.cmd, timeout)))
        File "neutron/common/utils.py", line 649, in wait_until_true
          raise exception
      RuntimeError: Process ['ncat', u'20.0.0.5', '3333', '-w', '20'] hasn't been spawned in 20 seconds

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