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Reviewed:  https://review.opendev.org/c/openstack/neutron/+/876570
Committed: https://opendev.org/openstack/neutron/commit/cf96bd8bdf9751c54ba8d47569e4a1269fc61e9e
Submitter: "Zuul (22348)"
Branch:    master

commit cf96bd8bdf9751c54ba8d47569e4a1269fc61e9e
Author: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@xxxxxxxxxxxxxxxxxxxxxxxx>
Date:   Mon Mar 6 13:55:31 2023 +0100

    ovs: fix regression when vlan mapping is not already registered
    
    Bug introduced by Ic3c147136549b17aea0fe78e930a41a5b33ab9d8, when a
    VLAN mapping is not registered during a call to
    update_network_segement, the function should return None.
    
    Closes-Bug: #2009215
    Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@xxxxxxxxxxxxxxxxxxxxxxxx>
    Change-Id: I91f8e8bd18d9956216e5715c658dfb408a2cbf07


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2009215

Title:
  [OVS] Error during OVS agent start

Status in neutron:
  Fix Released

Bug description:
  During the OVS agent initialization, in the first loop, all the ports
  present in the OVS are processed. In [1]->[2]->[3]...->[4]->[5], the
  vlan manager raises an exception "MappingNotFound" that is not catch
  by the try/except context. This exception was handled before [6].

  The vlan manager is updated after this first loop and the network is
  added to the vlan manager dictionary.

  This exception [7] should be handled properly.

  [1]https://github.com/openstack/neutron/blob/0a214b0437874fd7f5379ec94fd07ef5d3ff4bbe/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L2794
  [2]https://github.com/openstack/neutron/blob/0a214b0437874fd7f5379ec94fd07ef5d3ff4bbe/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L2190
  [3]https://github.com/openstack/neutron/blob/0a214b0437874fd7f5379ec94fd07ef5d3ff4bbe/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1990
  [4]https://github.com/openstack/neutron/blob/0a214b0437874fd7f5379ec94fd07ef5d3ff4bbe/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L688
  [5]https://github.com/openstack/neutron/blob/0a214b0437874fd7f5379ec94fd07ef5d3ff4bbe/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L501
  [6]https://review.opendev.org/c/openstack/neutron/+/839479
  [7]https://paste.opendev.org/show/bp3Q5J3rUlhx5CwGzdtc/

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