Concurrent failure in create_am with buildfarm member conchuela

Hi all,

conchuela has just reported the following error:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=conchuela&dt=2020-09-03%2023%3A00%3A36

-- Drop access method cascade
 DROP ACCESS METHOD gist2 CASCADE;
 NOTICE:  drop cascades to index grect2ind2
+ERROR:  deadlock detected
+DETAIL:  Process 609175 waits for AccessExclusiveLock on relation 17347 of database 16384; blocked by process 609183.
+Process 609183 waits for RowExclusiveLock on relation 20095 of database 16384; blocked by process 609175.
+HINT:  See server log for query details.

Looking at the logs, 609183 is running an autovacuum analyze:
2020-09-04 01:04:52.895 CEST [609183:6] LOG: automatic analyze of
table "regression.public.tenk2" system usage: CPU: user: 0.03 s,
system: 0.00 s, elapsed: 0.59 s

I have not looked at that stuff much yet.

Thanks,
--
Michael