Several buildfarm animals fail tests because of shared memory error - Mailing list pgsql-hackers

Hello hackers,

I'd like to bring your attention to multiple buildfarm failures, which
occurred this month, on master only, caused by "could not open shared
memory segment ...: No such file or directory" errors.

First such errors were produced on 2024-12-16 by:
leafhopper
Amazon Linux 2023 | gcc 11.4.1 | aarch64/graviton4/r8g.2xl | tharar [ a t ] amazon.com
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=leafhopper&dt=2024-12-16%2012%3A27%3A01
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=leafhopper&dt=2024-12-16%2020%3A40%3A09

and batta:
sid | gcc recent | aarch64 | michael [ a t ] paquier.xyz
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=batta&dt=2024-12-16%2008%3A05%3A04

Then there was alligator:
Ubuntu 24.04 LTS | gcc experimental (nightly build) | x86_64 | tharakan [ a t ] gmail.com
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=alligator&dt=2024-12-19%2001%3A30%3A57

and parula:
Amazon Linux 2 | gcc 13.2.0 | aarch64/Graviton3/c7g.2xl | tharar [ a t ] amazon.com
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=parula&dt=2024-12-21%2009%3A56%3A28

Maybe it's a configuration issue (all animals except batta are owned by
Robins), as described here:
https://www.postgresql.org/docs/devel/kernel-resources.html#SYSTEMD-REMOVEIPC

And maybe leafhopper is faulty by itself, because it also produced very
weird test outputs (in older branches) like:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=leafhopper&dt=2024-12-16%2023%3A43%3A03
REL_15_STABLE
-               Rows Removed by Filter: 9990
+               Rows Removed by Filter: 447009543

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=leafhopper&dt=2024-12-21%2022%3A18%3A04
REL_16_STABLE
-               Rows Removed by Filter: 9990
+               Rows Removed by Filter: 9395

But still why master only?

Unfortunately I'm unable to reproduce such failures locally, so I'm sorry
for such raw information, but I see no way to investigate this further
without assistance. Perhaps owners of these animals could shed some light
on this...

Best regards,
Alexander