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[Bug 1691248] [NEW] test_dhcpv6_64_subnets failed with "u'IpAddressAlreadyAllocated', u'message': u'IP address 2003::XXX already allocated in subnet"

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Public bug reported:

http://logs.openstack.org/20/464020/5/check/gate-tempest-dsvm-neutron-
linuxbridge-ubuntu-xenial/a4d35a8/logs/testr_results.html.gz

Traceback (most recent call last):
  File "tempest/api/network/test_dhcp_ipv6.py", line 230, in test_dhcpv6_64_subnets
    subnet_slaac = self.create_subnet(self.network, **kwargs)
  File "tempest/api/network/base.py", line 180, in create_subnet
    **kwargs)
  File "tempest/lib/services/network/subnets_client.py", line 27, 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 270, in post
    return self.request('POST', url, extra_headers, headers, body, chunked)
  File "tempest/lib/common/rest_client.py", line 659, in request
    self._error_checker(resp, resp_body)
  File "tempest/lib/common/rest_client.py", line 780, in _error_checker
    raise exceptions.Conflict(resp_body, resp=resp)
tempest.lib.exceptions.Conflict: An object with that identifier already exists
Details: {u'detail': u'', u'type': u'IpAddressAlreadyAllocated', u'message': u'IP address 2003::f816:3eff:fe20:97dd already allocated in subnet 9fd8d6ef-eb85-468c-8453-6c532c61a433'}

The request that failed is req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8.

In neutron-server log:

May 16 17:43:04.748624 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG neutron.db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Retry wrapper got retriable exception: UPDATE statement on table 'standardattributes' expected to update 1 row(s); 0 were matched. {{(pid=16472) wrapped /opt/stack/new/neutron/neutron/db/api.py:129}}
May 16 17:43:04.749082 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG oslo_db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit {{(pid=16472) wrapper /usr/local/lib/python2.7/dist-packages/oslo_db/api.py:152}}

May 16 17:43:04.998299 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG neutron.db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Retry wrapper got retriable exception: Failed to create a duplicate IpamAllocation: for attribute(s) ['PRIMARY'] with value(s) 2003::f816:3eff:fe20:97dd-a561d8cf-6822-4fb7-8b33-499041cefac4 {{(pid=16472) wrapped /opt/stack/new/neutron/neutron/db/api.py:129}}
May 16 17:43:04.998410 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG oslo_db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit {{(pid=16472) wrapper /usr/local/lib/python2.7/dist-packages/oslo_db/api.py:152}}

Seems like different reasons for retries? Is it some unfortunate
scenario where different errors depleted attempts?

** Affects: neutron
     Importance: High
         Status: New


** Tags: api db gate-failure l3-ipam-dhcp

** Changed in: neutron
   Importance: Undecided => High

** Tags added: api db l3-ipam-dhcp

** Tags added: gate-failure

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https://bugs.launchpad.net/bugs/1691248

Title:
  test_dhcpv6_64_subnets failed with "u'IpAddressAlreadyAllocated',
  u'message': u'IP address 2003::XXX already allocated in subnet"

Status in neutron:
  New

Bug description:
  http://logs.openstack.org/20/464020/5/check/gate-tempest-dsvm-neutron-
  linuxbridge-ubuntu-xenial/a4d35a8/logs/testr_results.html.gz

  Traceback (most recent call last):
    File "tempest/api/network/test_dhcp_ipv6.py", line 230, in test_dhcpv6_64_subnets
      subnet_slaac = self.create_subnet(self.network, **kwargs)
    File "tempest/api/network/base.py", line 180, in create_subnet
      **kwargs)
    File "tempest/lib/services/network/subnets_client.py", line 27, 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 270, in post
      return self.request('POST', url, extra_headers, headers, body, chunked)
    File "tempest/lib/common/rest_client.py", line 659, in request
      self._error_checker(resp, resp_body)
    File "tempest/lib/common/rest_client.py", line 780, in _error_checker
      raise exceptions.Conflict(resp_body, resp=resp)
  tempest.lib.exceptions.Conflict: An object with that identifier already exists
  Details: {u'detail': u'', u'type': u'IpAddressAlreadyAllocated', u'message': u'IP address 2003::f816:3eff:fe20:97dd already allocated in subnet 9fd8d6ef-eb85-468c-8453-6c532c61a433'}

  The request that failed is req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8.

  In neutron-server log:

  May 16 17:43:04.748624 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG neutron.db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Retry wrapper got retriable exception: UPDATE statement on table 'standardattributes' expected to update 1 row(s); 0 were matched. {{(pid=16472) wrapped /opt/stack/new/neutron/neutron/db/api.py:129}}
  May 16 17:43:04.749082 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG oslo_db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit {{(pid=16472) wrapper /usr/local/lib/python2.7/dist-packages/oslo_db/api.py:152}}

  May 16 17:43:04.998299 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG neutron.db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Retry wrapper got retriable exception: Failed to create a duplicate IpamAllocation: for attribute(s) ['PRIMARY'] with value(s) 2003::f816:3eff:fe20:97dd-a561d8cf-6822-4fb7-8b33-499041cefac4 {{(pid=16472) wrapped /opt/stack/new/neutron/neutron/db/api.py:129}}
  May 16 17:43:04.998410 ubuntu-xenial-osic-cloud1-s3700-8840984 neutron-server[16388]: DEBUG oslo_db.api [req-e628a3d3-3c24-4ced-81b0-ec28993ef6f8 tempest-NetworksTestDHCPv6-363802631 tempest-NetworksTestDHCPv6-363802631] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit {{(pid=16472) wrapper /usr/local/lib/python2.7/dist-packages/oslo_db/api.py:152}}

  Seems like different reasons for retries? Is it some unfortunate
  scenario where different errors depleted attempts?

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