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>> Once in a while a test fails for e.g.
>> tempest.api.network.test_dhcp_ipv6.NetworksTestDHCPv6.test_dhcpv6_two_subnets
>> that failed recently in Jenkins. But I am pretty sure it will succeed if
>> the suite is re-run.
> 
> Have you looked to see if the same test is failing for the regular
> neutron jobs?  Or does it seem to be OVN specific?

I have not seen this failure before in any of the other (around 30) ovn logs I’ve parsed. It was due to an existing IP Address in the create_subnet call (HTTP 409). OVN wasn’t in the stack trace.

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "tempest/api/network/test_dhcp_ipv6.py", line 188, in test_dhcpv6_two_subnets
          subnet_slaac = self.create_subnet(self.network, **kwargs)
        File "tempest/api/network/base.py", line 187, in create_subnet
          **kwargs)
        File "tempest/services/network/json/network_client.py", line 110, in create_subnet
          return self._create_resource(uri, post_data)
        File "tempest/services/network/json/network_client.py", line 72, in _create_resource
          resp, body = self.post(req_uri, req_post_data)
        File "/opt/stack/new/tempest/.tox/all/local/lib/python2.7/site-packages/tempest_lib/common/rest_client.py", line 256, in post
          return self.request('POST', url, extra_headers, headers, body)
        File "/opt/stack/new/tempest/.tox/all/local/lib/python2.7/site-packages/tempest_lib/common/rest_client.py", line 643, in request
          resp, resp_body)
        File "/opt/stack/new/tempest/.tox/all/local/lib/python2.7/site-packages/tempest_lib/common/rest_client.py", line 705, in _error_checker
          raise exceptions.Conflict(resp_body)
      tempest_lib.exceptions.Conflict: An object with that identifier already exists
      Details: {u'detail': u'', u'type': u'IpAddressInUse', u'message': u'Unable to complete operation for network a7b73f3f-37f2-4abc-8ea0-a22291f67b4e. The IP address 2003::f816:3eff:fe31:f72e is in use.’}

I don’t know the neutron answer yet, I will look into that.

Amitabha

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