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[melanie witt <1937375@xxxxxxxxxxxxxxxxxx>]

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

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

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

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

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

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

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

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1937375

Title:
  Duplicate BlockDeviceMapping if attaching volumes too fast

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New
Status in OpenStack Compute (nova) stein series:
  New
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New
Status in OpenStack Compute (nova) victoria series:
  New
Status in OpenStack Compute (nova) wallaby series:
  New

Bug description:
  Description
  ===========
  When attaching a volume to a running instance the nova-api validates that
  the volume is not already attached to the instance. However nova-compute
  is responsible for actually creating the BDM entry in the database.
  If sending attach requests fast enough it can be possible that the same
  "attach_volume" request can be sent to nova-compute for the same
  volume/instance combination.

  Steps to reproduce
  ==================
  * Create an Instance and a volume
  * run in 2 terminals in parallel "openstack server add volume <instance> <volume>"
  * when being fast enough this results in "openstack server show" to report the volume id twice

  Expected result
  ===============
  The volume is attached to the instance just once

  Actual result
  =============
  The volume is attached to the instance two (or with more parallelity) or more times.

  Environment
  ===========
  1. Happens on master till queens (possibly also earlier releases)

  2. Which hypervisor did you use?
     Indepentent of Hypervisor, observed with Libvirt

  2. Which storage type did you use?
     Independent of Storage, observed with ceph + nfs

  3. Which networking type did you use?
     Independent of Network, observed with ovs

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