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[OpenStack Infra <1838392@xxxxxxxxxxxxxxxxxx>]

This issue was fixed in the openstack/nova queens-eol  release.

** Changed in: nova/queens
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1838392

Title:
  BDMNotFound raised and stale block devices left over when
  simultaneously reboot and deleting an instance

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Fix Released
Status in OpenStack Compute (nova) rocky series:
  Fix Committed
Status in OpenStack Compute (nova) stein series:
  Fix Committed
Status in OpenStack Compute (nova) train series:
  Fix Committed

Bug description:
  Description
  ===========
  Simultaneous requests to reboot and delete an instance _will_ race as only the call to delete takes a lock against the instance.uuid.

  One possible outcome of this seen in the wild with the Libvirt driver
  is that the request to soft reboot will eventually turn into a hard
  reboot, reconnecting volumes that the delete request has already
  disconnected. These volumes will eventually be unmapped on the Cinder
  side by the delete request leaving stale devices on the host.
  Additionally BDMNotFound is raised by the reboot operation as the
  delete operation has already deleted the BDMs.

  Steps to reproduce
  ==================
  $ nova reboot $instance && nova delete $instance

  Expected result
  ===============
  The instance reboots and is then deleted without any errors raised.

  Actual result
  =============
  BDMNotFound raised and stale block devices left over.

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

  1599e3cf68779eafaaa2b13a273d3bebd1379c19 / 19.0.0.0rc1-992-g1599e3cf68

  2. Which hypervisor did you use?
     (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
     What's the version of that?

     Libvirt + QEMU/kvm

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?

     N/A

  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)

     N/A

  Logs & Configs
  ==============

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