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We are seeing a lot of tempest failures for the tests tempest.api.network.test_dhcp_ipv6.NetworksTestDHCPv6.* 
with the below error.

Either we should fix the error or at least disable these tests
temporarily.


t156.9: tempest.api.network.test_dhcp_ipv6.NetworksTestDHCPv6.test_dhcpv6_stateless_no_ra[id-ae2f4a5d-03ff-4c42-a3b0-ce2fcb7ea832]_StringException: Empty attachments:
  stderr
  stdout

pythonlogging:'': {{{
2016-02-26 07:29:46,168 4673 INFO     [tempest.lib.common.rest_client] Request (NetworksTestDHCPv6:test_dhcpv6_stateless_no_ra): 404 POST http://127.0.0.1:9696/v2.0/subnets 0.370s
2016-02-26 07:29:46,169 4673 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: {"subnet": {"cidr": "2003::/64", "ip_version": 6, "network_id": "4c7de56a-b059-4239-a5a0-94a53ba4929c", "gateway_ip": "2003::1", "ipv6_address_mode": "slaac"}}
    Response - Headers: {'content-length': '132', 'status': '404', 'date': 'Fri, 26 Feb 2016 07:29:46 GMT', 'connection': 'close', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-e21f771f-1a16-452a-9429-8a01f0409ae3'}
        Body: {"NeutronError": {"message": "Port 598c23eb-1ae4-4010-a263-39f86240fd86 could not be found.", "type": "PortNotFound", "detail": ""}}
2016-02-26 07:29:46,196 4673 INFO     [tempest.lib.common.rest_client] Request (NetworksTestDHCPv6:tearDown): 200 GET http://127.0.0.1:9696/v2.0/ports 0.024s
2016-02-26 07:29:46,197 4673 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'content-location': 'http://127.0.0.1:9696/v2.0/ports', 'content-length': '13', 'status': '200', 'date': 'Fri, 26 Feb 2016 07:29:46 GMT', 'connection': 'close', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-f0966c23-c72f-4a6f-b113-5d88a6dd5912'}
        Body: {"ports": []}
2016-02-26 07:29:46,250 4673 INFO     [tempest.lib.common.rest_client] Request (NetworksTestDHCPv6:tearDown): 200 GET http://127.0.0.1:9696/v2.0/subnets 0.052s
2016-02-26 07:29:46,251 4673 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'content-location': 'http://127.0.0.1:9696/v2.0/subnets', 'content-length': '457', 'status': '200', 'date': 'Fri, 26 Feb 2016 07:29:46 GMT', 'connection': 'close', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-3b29ba53-9ae0-4c0f-8c18-ec12db7a6bde'}
        Body: {"subnets": [{"name": "", "enable_dhcp": true, "network_id": "4c7de56a-b059-4239-a5a0-94a53ba4929c", "tenant_id": "631f9cb1391d41b6aba109afe06bc51b", "dns_nameservers": [], "gateway_ip": "2003::1", "ipv6_ra_mode": null, "allocation_pools": [{"start": "2003::2", "end": "2003::ffff:ffff:ffff:ffff"}], "host_routes": [], "ip_version": 6, "ipv6_address_mode": "slaac", "cidr": "2003::/64", "id": "6bc2602c-2584-44cc-a6cd-b8af444f6403", "subnetpool_id": null}]}
2016-02-26 07:29:46,293 4673 INFO     [tempest.lib.common.rest_client] Request (NetworksTestDHCPv6:tearDown): 200 GET http://127.0.0.1:9696/v2.0/routers 0.041s
2016-02-26 07:29:46,293 4673 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'content-location': 'http://127.0.0.1:9696/v2.0/routers', 'content-length': '15', 'status': '200', 'date': 'Fri, 26 Feb 2016 07:29:46 GMT', 'connection': 'close', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-2b883ce9-b10f-4a49-a854-450c341f9cd9'}
        Body: {"routers": []}
}}}

Traceback (most recent call last):
  File "tempest/api/network/test_dhcp_ipv6.py", line 129, in test_dhcpv6_stateless_no_ra
    real_ip, eui_ip = self._get_ips_from_subnet(**kwargs)
  File "tempest/api/network/test_dhcp_ipv6.py", line 91, in _get_ips_from_subnet
    subnet = self.create_subnet(self.network, **kwargs)
  File "tempest/api/network/base.py", line 196, in create_subnet
    **kwargs)
  File "tempest/lib/services/network/subnets_client.py", line 21, in create_subnet
    return self.create_resource(uri, post_data)
  File "tempest/lib/services/network/base.py", line 60, in create_resource
    resp, body = self.post(req_uri, req_post_data)
  File "tempest/lib/common/rest_client.py", line 259, in post
    return self.request('POST', url, extra_headers, headers, body)
  File "tempest/lib/common/rest_client.py", line 642, in request
    resp, resp_body)
  File "tempest/lib/common/rest_client.py", line 695, in _error_checker
    raise exceptions.NotFound(resp_body, resp=resp)
tempest.lib.exceptions.NotFound: Object not found
Details: {u'message': u'Port 598c23eb-1ae4-4010-a263-39f86240fd86 could not be found.', u'detail': u'', u'type': u'PortNotFound'}

** Affects: neutron
     Importance: Critical
     Assignee: Numan Siddique (numansiddique)
         Status: In Progress

-- 
tempest.api.network.test_dhcp_ipv6.NetworksTestDHCPv6.* tempest tests are failing repeatedly in the gate for networking-ovn
https://bugs.launchpad.net/bugs/1550278
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