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

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

** Tags added: multiattach volumes

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  detach multiattach volume disconnects innocent bystander

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

Bug description:
  Detaching a multi-attached lvm volume from one server, causes the
  other server to lose connectivity to the volume. I found this while
  developing a new tempest test to test this scenario.

  - create 2 instances on the same host, both simple instances with ephemeral 
  - create a multi-attach lvm volume, attach to both instances
  - check that you can re-read the partition table from inside each instance 
(via ssh):

     $ sudo blockdev --rereadpt /dev/vdb

    This succeeds on both instances (no output or err message is

  - detach the volume from one of the instances
  - recheck connectivity. The expected result is that the command will now fail 
in the instance where 
    the volume was detached. But it also fails on the instance where the volume 
is still supposedly 

     $ sudo blockdev --rereadpt /dev/vdb
     BLKRRPART: Input/output error

  cinder & nova still think that the volume is attached correctly:

  $ cinder show 2cf26a15-8937-4654-ba81-70cbcb97a238 | grep attachment
  | attachment_ids                 | ['f5876aff-5b5b-45a0-a020-515ca339eae4']   

  $ nova show vm1 | grep attached
  | os-extended-volumes:volumes_attached | [{"id": 
"2cf26a15-8937-4654-ba81-70cbcb97a238", "delete_on_termination": false}] |

  cinder version:
  :/opt/stack/cinder$ git show
  commit 015b1053990f00d1522c1074bcd160b4b57a5801
  Merge: 856e636 481535e
  Author: Zuul <z...@review.openstack.org>
  Date:   Thu Feb 22 14:00:17 2018 +0000

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