On Sun, Apr 11, 2021 at 9:10 AM Peter Geoghegan <p...@bowt.ie> wrote: > I don't have any reason to believe that using a super-exclusive lock > during heap page vacuuming is necessary. My guess is that returning to > doing it that way might make the buildfarm green again. That would at > least confirm my suspicion that this code is relevant. The > super-exclusive lock might have been masking the problem for a long > time.
This isn't just any super-exclusive lock, either -- we were calling ConditionalLockBufferForCleanup() at this point. I now think that there is a good chance that we are seeing these symptoms because the "conditional-ness" went away -- we accidentally relied on that. -- Peter Geoghegan
