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[Andrey Pavlov <andrey.mp@xxxxxxxxx>]

@John, I saw such behavior in ec2-api project.
and I pasted link to logs of ec2-api in comment #5.
There is a link to line where ec2-api makes request to cinder for volume attach.
After this line we can see requests to cinder for volume information and response contains the attached volume but without attachment information.

** Changed in: cinder
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/1633535

Title:
  Cinder fails to attach second volume to Nova VM

Status in Cinder:
  Confirmed
Status in ec2-api:
  New
Status in Manila:
  Confirmed
Status in OpenStack Compute (nova):
  New
Status in tempest:
  New

Bug description:
  Cinder fails to attach second volume to Nova VM. This second volume gets "in-use" status, but does not have any attachments. Also,  such volume cannot be detached from VM [4].  Test gerrit change [2] proves that commit to Cinder [3] is THE CAUSE of a bug.
  Also, bug was reproduced even before merge of [3] with "gate-rally-dsvm-cinder" CI job [4], but, I assume, no one has paid attention to this.

  Local testing shows that IF bug appears then volume never gets
  attached and list of attachments stays empty. And waiting between
  'create' (wait until 'available' status) and 'attach' commands does
  not help at all.

  How to reproduce:
  1) Create VM
  2) Create Volume
  3) Attach volume (2) to the VM (1)
  4) Create second volume
  5) Try attach second volume (4) to VM (1) - it will fail.

  [Tempest] Also, the fact that Cinder gates passed with [3] means that
  tempest does not have test that attaches more than one volume to one
  Nova VM. And it is also tempest bug, that should be addressed.

  [Manila] In scope of Manila project, one of its drivers is broken -
  Generic driver that uses Cinder as backend.

  [1] http://logs.openstack.org/64/386364/1/check/gate-manila-tempest-
  dsvm-postgres-generic-singlebackend-ubuntu-xenial-
  nv/eef11b0/logs/screen-m-shr.txt.gz?level=TRACE#_2016-10-14_15_15_19_898

  [2] https://review.openstack.org/387915

  [3]
  https://github.com/openstack/cinder/commit/6f174b412696bfa6262a5bea3ac42f45efbbe2ce
  ( https://review.openstack.org/385122 )

  [4] http://logs.openstack.org/22/385122/1/check/gate-rally-dsvm-
  cinder/b0332e2/rally-
  plot/results.html.gz#/CinderVolumes.create_snapshot_and_attach_volume/failures

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