[Bug 1531963] Re: trusty/icehouse neutron-plugin-openvswitch-agent: lvm.tun_ofports.remove crashes with KeyError

[Corey Bryant]

Seems like a fairly straightforward backport for icehouse (assuming you
don't need the ofagent bits).

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https://bugs.launchpad.net/bugs/1531963

Title:
  trusty/icehouse neutron-plugin-openvswitch-agent:
  lvm.tun_ofports.remove crashes with KeyError

Status in neutron package in Ubuntu:
  Triaged

Bug description:
  Filing this on ubuntu/neutron package, as neutron itself is EOL'd for
  Icehouse.

  FYI this is a nonHA icehouse/trusty deploy using serverteam's juju
  charms.

  On one of our production environments with a rather high rate of API
  calls, (sp for  transient VMs from CI), we frequently get neutron OVS
  breakage on compute nodes¹, which we've been able to more or less
  correlate with the following alike errors at /var/log/neutron
  /openvswitch-agent.log:

  2016-01-07 06:33:48.917 18357 TRACE neutron.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 399, in _del_fdb_flow
  2016-01-07 06:33:48.917 18357 TRACE neutron.openstack.common.rpc.amqp     lvm.tun_ofports.remove(ofport)
  2016-01-07 06:33:48.917 18357 TRACE neutron.openstack.common.rpc.amqp KeyError: '13'

  Detailed log: http://paste.ubuntu.com/14431656/  - note the same time
  of occurrence on the 3 diff compute nodes shown there.

  ¹ What we then observe are missing are missing tun_ids from
    ovs-ofctl dump-flows br-tun
  ie provider:segmentation_id not present at the compute node for a VM with a neutron network that has it.

  Afaics this had been fixed upstream at ( lp#1421105 ):
  https://git.openstack.org/cgit/openstack/neutron/commit/?id=841b2f58f375df53b380cf5796bb31c82cd09260
  , please consider backporting it to Icehouse, it's a pretty trivial fix.

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