Comment 4 for bug 1398588

Reporter didn't provide a version. Using the latest from master, I was not able to reproduce this issue (see below). Since the reporter mentioned that Cinder does not know about this false attachment, but Nova does, I would bet something is being set on the Nova side.

ubuntu@mount-issue:~/devstack$ nova list
c+--------------------------------------+---------+--------+------------+-------------+------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+---------+--------+------------+-------------+------------------+
| 57304c45-101d-4ce0-8f4b-6b7ad853d135 | server1 | ACTIVE | - | Running | private=10.0.0.2 |
| 1cb270bd-2131-42fa-9f99-ed95cd077cde | server2 | ACTIVE | - | Running | private=10.0.0.3 |
+--------------------------------------+---------+--------+------------+-------------+------------------+
iubuntu@mount-issue:~/devstack$ cinder list
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
| ID | Status | Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
| 2a57f161-0828-4b68-8f93-cd4493ff725b | available | None | 1 | lvmdriver-1 | false | |
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
ubuntu@mount-issue:~/devstack$ nova volume-attach server1 2a57f161-0828-4b68-8f93-cd4493ff725b
+----------+--------------------------------------+
| Property | Value |
+----------+--------------------------------------+
| device | /dev/vdb |
| id | 2a57f161-0828-4b68-8f93-cd4493ff725b |
| serverId | 57304c45-101d-4ce0-8f4b-6b7ad853d135 |
| volumeId | 2a57f161-0828-4b68-8f93-cd4493ff725b |
+----------+--------------------------------------+
ubuntu@mount-issue:~/devstack$ nova volume-attach server2 2a57f161-0828-4b68-8f93-cd4493ff725b
ERROR (BadRequest): Invalid volume: volume '2a57f161-0828-4b68-8f93-cd4493ff725b' status must be 'available'. Currently in 'in-use' (HTTP 400) (Request-ID: req-bfa40f00-56f9-4535-a4d1-23a8cb69b908)
ubuntu@mount-issue:~/devstack$ nova volume-attach server2 2a57f161-0828-4b68-8f93-cd4493ff725b
ERROR (BadRequest): Invalid volume: volume '2a57f161-0828-4b68-8f93-cd4493ff725b' status must be 'available'. Currently in 'in-use' (HTTP 400) (Request-ID: req-83736950-ff20-4d93-b512-ab7ffc25c7bc)
ubuntu@mount-issue:~/devstack$ cinder list
+--------------------------------------+--------+------+------+-------------+----------+--------------------------------------+
| ID | Status | Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+--------+------+------+-------------+----------+--------------------------------------+
| 2a57f161-0828-4b68-8f93-cd4493ff725b | in-use | None | 1 | lvmdriver-1 | false | 57304c45-101d-4ce0-8f4b-6b7ad853d135 |
+--------------------------------------+--------+------+------+-------------+----------+--------------------------------------+
ubuntu@mount-issue:~/devstack$ http http://localhost:8774/v2/b9903b32e6e94a5ab2ee40e217be0fab/servers/1cb270bd-2131-42fa-9f99-ed95cd077cde/os-volume_attachments X-Auth-Token:'e08bc40fd5f148cf817f99c1133da8aa'
HTTP/1.1 200 OK
Content-Length: 25
Content-Type: application/json
Date: Fri, 02 Jan 2015 18:37:27 GMT
X-Compute-Request-Id: req-5d213be2-60af-450a-b521-8f979d5a80e6

{
    "volumeAttachments": []
}