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[AJAY KALAMBUR <akalambu@xxxxxxxxx>]

Public bug reported:

Nova sends a request for port unbind with binding host "" and this can
sometimes lead to a problem when nova's cache is different than
Neutron's view of instance-port mappings.

Steps
1. Create a neutron port
2. Create a VM and launch instance with this port
3. Shutdown nova compute and neutron agents on compute node where this VM was spawned
4. Unbind port from VM and delete the VM(Notice offline delete is a DB operation as request cant be completed on compute node as it is down)
5. Now create a new VM with same port on a different compute node
6. Bring up nova compute on the first node

After 30 minutes the running deleted instance reap runs and detects a VM
in libvirt which is not present in nova database. It cleans up the VM
but in the process it unbinds the pre-existing port which is now
attached to a completely different VM on a different compute node

Root cause: nova unbind request does not check if port is bound to
current instance from Neutron standpoint

** Affects: nova
     Importance: Undecided
     Assignee: AJAY KALAMBUR (akalambu)
         Status: New

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https://bugs.launchpad.net/bugs/1634269

Title:
  Incorrect port unbind request on instance delete

Status in OpenStack Compute (nova):
  New

Bug description:
  Nova sends a request for port unbind with binding host "" and this can
  sometimes lead to a problem when nova's cache is different than
  Neutron's view of instance-port mappings.

  Steps
  1. Create a neutron port
  2. Create a VM and launch instance with this port
  3. Shutdown nova compute and neutron agents on compute node where this VM was spawned
  4. Unbind port from VM and delete the VM(Notice offline delete is a DB operation as request cant be completed on compute node as it is down)
  5. Now create a new VM with same port on a different compute node
  6. Bring up nova compute on the first node

  After 30 minutes the running deleted instance reap runs and detects a
  VM in libvirt which is not present in nova database. It cleans up the
  VM but in the process it unbinds the pre-existing port which is now
  attached to a completely different VM on a different compute node

  Root cause: nova unbind request does not check if port is bound to
  current instance from Neutron standpoint

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