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[Dave Walker <email@xxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1501515

Title:
  DBReferenceError is raised when updating dvr port binding

Status in neutron:
  Fix Released
Status in neutron kilo series:
  New

Bug description:
  several tests upstream are failing with a DBReferenceError exception when calls to 
  File "/opt/stack/new/neutron/neutron/plugins/ml2/db.py", line 208, in ensure_dvr_port_binding

  This appears to be caused by accessing database resource without
  locking it (race condition).

  Here is an excerpt of the error: 
  2015-09-29 18:39:00.822 7813 ERROR oslo_messaging.rpc.dispatcher DBReferenceError: (pymysql.err.IntegrityError) (1452, u'Cannot add or update a child row: a foreign key constraint fails (`neutron`.`ml2_dvr_port_bindings`, CONSTRAINT `ml2_dvr_port_bindings_ibfk_1` FOREIGN KEY (`port_id`) REFERENCES `ports` (`id`) ON DELETE CASCADE)') [SQL: u'INSERT INTO ml2_dvr_port_bindings (port_id, host, router_id, vif_type, vif_details, vnic_type, profile, status) VALUES (%s, %s, %s, %s, %s, %s, %s, %s)'] [parameters: (u'851c0627-5133-43e2-b7a3-da9c29afd4ea', u'devstack-trusty-hpcloud-b2-5150973', u'973254dc-d1aa-4177-b952-2ac648bad4b5', 'unbound', '', 'normal', '', 'DOWN')]

  An example of the failure can be found here: 
  http://logs.openstack.org/17/227517/3/check/gate-tempest-dsvm-neutron-dvr/fc1efa2/logs/screen-q-svc.txt.gz?level=ERROR

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