Description of problem:
In the view of "Volumes", provided that some volume whose status is "in-use" or it is being attached to a VM. If the associated VM is deleted, this will trigger the detaching of the volume. If the volume detaching process is failed by whatever reason, then the volume becomes attached to an already-deleted VM.
If now, we try retrieving the volume info with Horizon dashboard then we will get the error of "Unable to retrieve attachment information".
The upstream patch is merged.
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.