The analysis from the db dump makes sense, but that does not explain why the topology info displays used space on the device with no bricks at all (see the initial description of the bug). So, I am reopening the bug.
Also it would be good if the bugs are not closed without QE consent.
*** Bug 1598685 has been marked as a duplicate of this bug. ***
Updated doc text in the Doc Text field. Please review for technical accuracy.
Doc Text seems OK
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.