Comment 2 for bug 1370867

I am exploring how to reproduce it, but cannot so far. I experienced this three times in these two month in our lab using Icehouse with ~20 nodes. I noticed this because Horizon Overview page (the default login page) cannot be displayed with a traceback. I will keep exploring how to repro.
Note that the full tempest jobs are run daily and the database backend is Galera cluster.

(On Horizon side, it brings bad user experience as the default page after login is affected, so a workaround to replace negative values in total*Used with 0 is under review and it will be backported to Icehouse.)