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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

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

** Changed in: neutron
    Milestone: None => liberty-rc1

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https://bugs.launchpad.net/bugs/1408855

Title:
  Deleting floating ip fails in concurrent scenario

Status in neutron:
  Fix Released

Bug description:
  The problem is caused by the "check_fips_availability_on_host"
  function in l3_dvr_db.py. Here is the related code:

  floating_ips = self._get_sync_floating_ips(context, router_ids)
  # Check for the active floatingip in the host
  for fip in floating_ips:
      f_host = self.get_vm_port_hostid(context, fip['port_id'])

  In the concurrent scenario, when one process traverses the
  floating_ips list to get the f_host, the port associated with fip may
  be deleted by another process, the PortNotFound exception will be
  raised, which fails "check_fips_availability_on_host".

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