Andrew Dunstan <andrew.duns...@2ndquadrant.com> writes: > On 03/03/2017 02:24 PM, Andrew Dunstan wrote: >> I have been setting up a buildfarm member with -DRELCACHE_FORCE_RELEASE >> -DCLOBBER_FREED_MEMORY, settings which Alvaro suggested to me.I got core >> dumps with these stack traces. The platform is Amazon Linux.
> I have replicated this on a couple of other platforms (Fedora, FreeBSD) > and back to 9.5. The same failure doesn't happen with buildfarm runs on > earlier branches, although possibly they don't have the same set of tests. well, the problem in rebuild_relation() seems pretty blatant: /* Close relcache entry, but keep lock until transaction commit */ heap_close(OldHeap, NoLock); /* Create the transient table that will receive the re-ordered data */ OIDNewHeap = make_new_heap(tableOid, tableSpace, OldHeap->rd_rel->relpersistence, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AccessExclusiveLock); There are two such references after the heap_close. I don't know that those are the only bugs, but this reference is certainly the proximate cause of the crash I'm seeing. Will push a fix in a little bit. regards, tom lane -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers