slot_creation_error failures

Hi,

Here are some recent $SUBJECT on HEAD.  Unfortunately we don't see the
regression.diffs file :-(

bfbot=> select make_snapshot_url(animal, snapshot) from run where
'slot_creation_error' = any(fail_tests) order by snapshot desc;
                                       make_snapshot_url
------------------------------------------------------------------------------------------------
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-07-21%2023:33:50
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-06-15%2003:12:54
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-05-10%2021:03:37
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-04-11%2021:04:15
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-04-08%2018:04:15
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=fairywren&dt=2022-04-01%2018:27:29
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=calliphoridae&dt=2022-03-08%2001:14:51
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=flaviventris&dt=2022-02-24%2015:17:30
 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=wrasse&dt=2022-02-15%2009:29:06
(9 rows)