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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

I'm not sure it's neutron bug. adding nova.

** Also affects: nova
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1401060

Title:
  Linux Bridge not getting removed,if ovs is not running and if we
  terminate failed instance

Status in OpenStack Neutron (virtual network service):
  New
Status in OpenStack Compute (Nova):
  New

Bug description:
  Using icehouse on ubuntu 12.04 with multiple compute nodes in
  multiple AZ.

  On one of the AZ there is only one compute node!!.

  When tried to create instance on that AZ  because of high CPU usage on
  that compute node ovs failed (can be because of different reason but
  ovs was not running) and on horizon it returned "No valid host" error
  ,so i terminated that instance from horizon ,but on compute node linux
  bridge created for that instance is still there with its corresponding
  veth pairs.

  One instance was already running on this compute node.

  brctl show

  bridge name     bridge id               STP enabled     interfaces
  qbrcdae4dcb-2a          8000.a20e6c7d8c0d       no              qvbcdae4dcb-2a
                                                          tapcdae4dcb-2a
  qbrdc9ab313-bf          8000.6e8c6790ebaa       no              qvbdc9ab313-bf
  virbr0          8000.000000000000       yes

  and

  ethtool -S qvbdc9ab313-bf
  NIC statistics:
       peer_ifindex: 16

  ip a |grep 16

  16: qvodc9ab313-bf: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500
  qdisc pfifo_fast state UP qlen 100

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