Re: REINDEX INDEX results in a crash for an index of pg_class since 9.6

On Thu, May 02, 2019 at 07:18:19PM -0400, Tom Lane wrote:
> I did manually verify that all branches get through "reindex table
> pg_class" and "reindex index pg_class_oid_index" under
> CLOBBER_CACHE_ALWAYS, as well as a normal-mode check-world. But CCA
> world runs seem like a good idea.

(catching up a bit..)

sidewinder is still pissed of as of HEAD, pointing visibly to f912d7d
as the root cause:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=sidewinder&dt=2019-05-03%2021%3A45%3A00

REINDEX TABLE pg_class; -- mapped, non-shared, critical
+ERROR: deadlock detected
+DETAIL: Process 28266 waits for ShareLock on transaction 2988;
blocked by process 20650.
+Process 20650 waits for RowExclusiveLock on relation 1259 of
database 16387; blocked by process 28266.
+HINT: See server log for query details.

I don't think that's sane just before the upcoming release..
--
Michael