On Sun, Apr 11, 2021 at 9:10 AM Peter Geoghegan <pg@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