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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** This bug is no longer a duplicate of bug 1683972
   Overlapping iSCSI volume detach/attach can leave behind broken SCSI devices and multipath maps.

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https://bugs.launchpad.net/bugs/1662483

Title:
  detach_volume races with delete

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed
Status in OpenStack Compute (nova) queens series:
  Confirmed
Status in OpenStack Compute (nova) rocky series:
  Confirmed

Bug description:
  If a client does:

  nova volume-detach foo vol
  nova delete foo

  Assuming the volume-detach takes a moment, which it normally does, the
  delete will race with it also also attempt to detach the same volume.
  It's possible there are no side effects from this other than untidy
  log messages, but this is difficult to prove.

  I found this looking through CI logs.

  Note that volume-detach can also race with other instance operations,
  including itself. I'm almost certain that if you poke hard enough
  you'll find some combination that breaks things badly.

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