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[Rodolfo Alonso <1884512@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Deployment using OVS as network backend. QoS enabled.

During the port deletion, the QoS OVS agent extension removes the
possible QoS rules applied on a port (max BW egress/ingress, min BW
egress/ingress).

During this process, in "delete_ingress_bw_limit_for_port", the port is
checked and then, if exists, it is modified to delete the QoS reference
(clear "qos" column in "port" DB register).

As seen in [1], the port can be deleted between both operations
(retrieval, modification), resulting in an error.

[1]http://paste.openstack.org/show/795047/

** Affects: neutron
     Importance: Undecided
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1884512

Title:
  [QoS] Race condition during port qos rules deletion

Status in neutron:
  In Progress

Bug description:
  Deployment using OVS as network backend. QoS enabled.

  During the port deletion, the QoS OVS agent extension removes the
  possible QoS rules applied on a port (max BW egress/ingress, min BW
  egress/ingress).

  During this process, in "delete_ingress_bw_limit_for_port", the port
  is checked and then, if exists, it is modified to delete the QoS
  reference (clear "qos" column in "port" DB register).

  As seen in [1], the port can be deleted between both operations
  (retrieval, modification), resulting in an error.

  [1]http://paste.openstack.org/show/795047/

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