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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Yeah I recreated:

http://paste.openstack.org/show/737236/

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

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

** Changed in: nova/queens
       Status: New => Confirmed

** Changed in: nova/queens
   Importance: Undecided => Medium

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Changed in: nova
   Importance: Undecided => Medium

** Changed in: nova/rocky
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1808089

Title:
  Feature to detach volume from a shelved(_offloaded) instance is broken

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

Bug description:
  In microversion 2.20 we added the ablility to detach/attach volumes from a shelved(_offloaded) instance:
  http://git.openstack.org/cgit/openstack/nova/tree/nova/api/openstack/compute/rest_api_version_history.rst?h=stable/rocky#n177

  But after we uses the cinder new attach workflow, this feature is
  broken, as when we delete the attachment the volume status changed to
  "reserved" and we cannot detach the volume with this status.

  http://git.openstack.org/cgit/openstack/nova/tree/nova/compute/manager.py?h=stable/rocky#n4469

  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: INFO cinder.api.openstack.wsgi [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] DELETE http://10.76.150.197/volume/v3/5f8092daf17b4b6a83472595eacaa219/attachments/60d6c3e1-9ced-4e64-a2aa-c5dae2248f5b
  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: DEBUG cinder.api.openstack.wsgi [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] Empty body provided in request {{(pid=2922) get_body /opt/stack/cinder/cinder/api/openstack/wsgi.py:719}}
  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: DEBUG cinder.api.openstack.wsgi [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] Calling method 'version_select' {{(pid=2922) _process_stack /opt/stack/cinder/cinder/api/openstack/wsgi.py:873}}
  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: DEBUG cinder.volume.api [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] Remaining volume attachments: VolumeAttachmentList(objects=[VolumeAttachment(cb3a2f68-fc14-4a2e-9b2a-78e049a1b23c)]) {{(pid=2922) attachment_delete /opt/stack/cinder/cinder/volume/api.py:2186}}
  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: DEBUG cinder.volume.api [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] Adding status of: reserved to pending status list for volume. {{(pid=2922) attachment_delete /opt/stack/cinder/cinder/volume/api.py:2195}}
  Dec 11 22:20:41 ubuntu devstack@c-api.service[2919]: DEBUG cinder.volume.api [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] Pending status list for volume during attachment-delete: [u'reserved'] {{(pid=2922) attachment_delete /opt/stack/cinder/cinder/volume/api.py:2199}}
  Dec 11 22:20:42 ubuntu devstack@c-api.service[2919]: INFO cinder.api.openstack.wsgi [req-7f18da0d-44db-4445-92df-0abc790dede9 req-3f6b8e1e-4072-400f-aa47-fcbffef3fe55 admin admin] http://10.76.150.197/volume/v3/5f8092daf17b4b6a83472595eacaa219/attachments/60d6c3e1-9ced-4e64-a2aa-c5dae2248f5b returned with HTTP 200

  And when I call detach volume on this, I got:
  {
      "badRequest": {
          "message": "Invalid volume: Invalid input received: Invalid volume: Unable to detach volume. Volume status must be 'in-use' and attach_status must be 'attached' to detach. (HTTP 400) (Request-ID: req-70a9bdb8-d4a5-432c-b11b-d3ce6cf179c7)",
          "code": 400
      }
  }

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