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When there are no indexes on a table, we vacuum each heap block after pruning it and then update the freespace map. Periodically, we also vacuum the freespace map. This was done while unnecessarily holding a lock on the heap page. Release the lock before calling FreeSpaceMapVacuumRange() and, while we're at it, ensure the range includes the heap block we just vacuumed. There are no known deadlocks or other similar issues, therefore don't backpatch. It's certainly not good to do all this work under a lock, but it's not frequently reached, making it not worth the risk of backpatching. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CAAKRu_YiL%3D44GvGnt1dpYouDSSoV7wzxVoXs8m3p311rp-TVQQ%40mail.gmail.com