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

[Chris J Arges]

Hello JuanJo, or anyone else affected,

Accepted neutron into trusty-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/neutron/1:2014.1.5-0ubuntu3 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: neutron (Ubuntu Trusty)
       Status: In Progress => Fix Committed

** Tags added: verification-needed

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

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

Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Trusty:
  Fix Committed

Bug description:
  [Impact]
  Neutron OVS breaks with unhandled exceptions on compute nodes.

  [Test Case]
  For reproduction see the original bug description below.

  [Regression Potential]

  The backported patch is very straightforward, with a few minor
  conflicts noted in the patch.

  -------------

  Original 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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