Reviewed:  https://review.openstack.org/372817
Committed: 
https://git.openstack.org/cgit/openstack/neutron/commit/?id=70907b3e5513828c330425d7629dae71d632ac72
Submitter: Jenkins
Branch:    master

commit 70907b3e5513828c330425d7629dae71d632ac72
Author: Kevin Benton <ke...@benton.pub>
Date:   Mon Sep 19 16:02:45 2016 -0700

    Always cleanup stale devices on DHCP setup failure
    
    If the DHCP port setup process fails in the DHCP agent device
    manager, it will throw a conflict exception, which will bubble
    all of the way up to the main DHCP agent. The issue is that, during
    a 'restart' call, the config files are wiped out while maintaining
    the VIF before calling setup. This means that, if setup fails, there
    is no reference to the interface name anymore so a subsequent destroy
    will not first unplug the VIF before destroying the namespace.
    This leaves a bunch of orphaned tap ports behind in the OVS case
    that don't have an accessible namespace.
    
    This patch addresses the issue by cleaning up all ports inside of
    a namespace on a 'setup' failure before reraising the exception.
    This ensures that the namespace is clear if destroy is called in the
    future without another successful setup.
    
    Closes-Bug: #1625325
    Change-Id: I0211422de51ce6acc6eb593eb890b606101cb9f0


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

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https://bugs.launchpad.net/bugs/1625325

Title:
  OVS port momentary lapse of reason

Status in neutron:
  Fix Released

Bug description:
  A phenomenon where OVS ports appear, disappear and show up again has
  been experienced lately (e.g. [1]). This seems to be associated to
  traces like below, where two separate interfaces get associated to the
  same ofport right about the same time:

  2016-09-19T17:34:48.065Z|00247|bridge|INFO|bridge br-int: added interface 
qvo9d9ab7b1-59 on port 89
  2016-09-19T17:34:48.077Z|00248|bridge|INFO|bridge br-int: added interface 
tapc9e6d02e-2c on port 89

  We need to figure out what's causing it, and fix it for good.

  [1] http://logs.openstack.org/40/367340/8/check/gate-grenade-dsvm-
  neutron-ubuntu-trusty/c809d17/logs/openvswitch/ovs-vswitchd.txt.gz

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