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[Bug 1625305] [NEW] neutron-openvswitch-agent is crashing due to KeyError in _restore_local_vlan_map()

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Public bug reported:

Neutron openvswitch agent is unable to restart because vms with
untagged/flat networks (tagged 3999) cause issue with
_restore_local_vlan_map

Loaded agent extensions: []
2016-09-06 07:57:39.682 70085 CRITICAL neutron [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] KeyError: 3999
2016-09-06 07:57:39.682 70085 ERROR neutron Traceback (most recent call last):
2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/bin/neutron-openvswitch-agent", line 28, in <module>
2016-09-06 07:57:39.682 70085 ERROR neutron     sys.exit(main())
2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 235, in __init__
2016-09-06 07:57:39.682 70085 ERROR neutron     self._restore_local_vlan_map()
2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 356, in _restore_local_vlan_map
2016-09-06 07:57:39.682 70085 ERROR neutron     self.available_local_vlans.remove(local_vlan)
2016-09-06 07:57:39.682 70085 ERROR neutron KeyError: 3999
2016-09-06 07:57:39.682 70085 ERROR neutron
2016-09-06 07:57:39.684 70085 INFO oslo_rootwrap.client [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] Stopping rootwrap daemon process with pid=70197

** Affects: neutron
     Importance: Undecided
         Status: New

** Summary changed:

- neutron-openvswitch-agent is crashing due to KeyError in ._restore_local_vlan_map()
+ neutron-openvswitch-agent is crashing due to KeyError in _restore_local_vlan_map()

** Description changed:

- Neutron openvswitch agent is unable to restart because vms with untagged
- networks (tagged 3999) cause issue with _restore_local_vlan_map
+ Neutron openvswitch agent is unable to restart because vms with
+ untagged/flat networks (tagged 3999) cause issue with
+ _restore_local_vlan_map
  
  Loaded agent extensions: []
  2016-09-06 07:57:39.682 70085 CRITICAL neutron [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] KeyError: 3999
  2016-09-06 07:57:39.682 70085 ERROR neutron Traceback (most recent call last):
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/bin/neutron-openvswitch-agent", line 28, in <module>
  2016-09-06 07:57:39.682 70085 ERROR neutron     sys.exit(main())
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 235, in __init__
  2016-09-06 07:57:39.682 70085 ERROR neutron     self._restore_local_vlan_map()
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 356, in _restore_local_vlan_map
  2016-09-06 07:57:39.682 70085 ERROR neutron     self.available_local_vlans.remove(local_vlan)
  2016-09-06 07:57:39.682 70085 ERROR neutron KeyError: 3999
  2016-09-06 07:57:39.682 70085 ERROR neutron
  2016-09-06 07:57:39.684 70085 INFO oslo_rootwrap.client [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] Stopping rootwrap daemon process with pid=70197

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https://bugs.launchpad.net/bugs/1625305

Title:
  neutron-openvswitch-agent is crashing due to KeyError in
  _restore_local_vlan_map()

Status in neutron:
  New

Bug description:
  Neutron openvswitch agent is unable to restart because vms with
  untagged/flat networks (tagged 3999) cause issue with
  _restore_local_vlan_map

  Loaded agent extensions: []
  2016-09-06 07:57:39.682 70085 CRITICAL neutron [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] KeyError: 3999
  2016-09-06 07:57:39.682 70085 ERROR neutron Traceback (most recent call last):
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/bin/neutron-openvswitch-agent", line 28, in <module>
  2016-09-06 07:57:39.682 70085 ERROR neutron     sys.exit(main())
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 235, in __init__
  2016-09-06 07:57:39.682 70085 ERROR neutron     self._restore_local_vlan_map()
  2016-09-06 07:57:39.682 70085 ERROR neutron   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 356, in _restore_local_vlan_map
  2016-09-06 07:57:39.682 70085 ERROR neutron     self.available_local_vlans.remove(local_vlan)
  2016-09-06 07:57:39.682 70085 ERROR neutron KeyError: 3999
  2016-09-06 07:57:39.682 70085 ERROR neutron
  2016-09-06 07:57:39.684 70085 INFO oslo_rootwrap.client [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] Stopping rootwrap daemon process with pid=70197

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