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[Kevin Benton <1673910@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We're getting the following error in the gate on linux bridge jobs:

2017-03-16 15:13:15.984 5903 ERROR oslo_messaging.rpc.server
libvirtError: Unable to add bridge brq776c3f9c-e6 port tapc5c67a59-f3:
Device or resource busy


This is caused by the merge of I2a23d0cbc4c4d0db6e9f48d91ca03b5007f91a84 which causes the LB agent to no longer skip compute ports. Even though os-vif has protection from races, it appears that libvirt itself is not robust to the tap being added to the bridge by another process.


1. http://logs.openstack.org/06/445706/5/gate/gate-tempest-dsvm-neutron-
linuxbridge-ubuntu-xenial/a1314ac/logs/screen-n-cpu.txt.gz?level=TRACE

** Affects: neutron
     Importance: High
     Assignee: Kevin Benton (kevinbenton)
         Status: New


** Tags: gate-failure

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

** Tags added: gate-failure

** Changed in: neutron
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1673910

Title:
  libvirt racing with linux bridge agent

Status in neutron:
  New

Bug description:
  We're getting the following error in the gate on linux bridge jobs:

  2017-03-16 15:13:15.984 5903 ERROR oslo_messaging.rpc.server
  libvirtError: Unable to add bridge brq776c3f9c-e6 port tapc5c67a59-f3:
  Device or resource busy

  
  This is caused by the merge of I2a23d0cbc4c4d0db6e9f48d91ca03b5007f91a84 which causes the LB agent to no longer skip compute ports. Even though os-vif has protection from races, it appears that libvirt itself is not robust to the tap being added to the bridge by another process.


  1. http://logs.openstack.org/06/445706/5/gate/gate-tempest-dsvm-
  neutron-linuxbridge-ubuntu-
  xenial/a1314ac/logs/screen-n-cpu.txt.gz?level=TRACE

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