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[melanie witt <1978444@xxxxxxxxxxxxxxxxxx>]

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

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

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

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

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

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

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1978444

Title:
  Volume can't be detached if attachment delete api call fails with 504
  gateway timeout

Status in OpenStack Compute (nova):
  Fix Released
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
Status in OpenStack Compute (nova) xena series:
  New
Status in OpenStack Compute (nova) yoga series:
  New

Bug description:
  Description
  ===========
  When cinder-api is running behind load balancer like haproxy, the load balancer can return 504 if it can not receive response from cinder-api within timeout.
  When this timeout occurs while detaching a volume, this results in un-detachable volume.

   - nova-compute calls delete attachment api in cinder
   - haproxy detects server timeout and returns 504
   - cinder continues processing the API and removes the attachment
   - nova-compute immediately aborts the volume detachment and leaves the bdm
   - when a client tries to detach the volume again, the detachment fails because the attachment no longer exists in Nova

  See for details https://bugzilla.redhat.com/show_bug.cgi?id=2002643

  Steps to reproduce
  ==================
  * Stop cinder-volume
  * Detach a volume from an instance
  * Start cinder-volume
  * Detach the volume again

  Expected result
  ===============
  * Volume can be detached after cinder-volume is recovered

  Actual result
  ===============
  * Volume can't be detached

  Environment
  ===========
  * The issue was initially found in stable/train

  Logs & Configs
  ==============
  * See https://bugzilla.redhat.com/show_bug.cgi?id=2002643#c1

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