This bug was initially created as a copy of Bug #1705563 Description of problem: Due to a race condition in the Cinder API, concurrent requests to attach the same non-multi-attach volume to the same instance can succeed.
Note to for self verification steps see: https://bugzilla.redhat.com/show_bug.cgi?id=1705563#c0
Awaiting newer build, insufficient to verify: 14 -p 2019-09-06.1 openstack-cinder-13.0.5-5.el7ost.noarch < fixed-in
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:3749