Weird failure with latches in curculio on v15

Hi all,

While browsing the buildfarm, I have noticed this failure on curcilio:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=curculio&dt=2023-02-01%2001%3A05%3A17

The test that has reported a failure is the check on the archive
module callback:
# Failed test 'check shutdown callback of shell archive module'
# at t/020_archive_status.pl line 248.
# Looks like you failed 1 test of 17.
[02:28:06] t/020_archive_status.pl ..............
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/17 subtests

Looking closer, this is a result of an assertion failure in the latch
code:
2023-02-01 02:28:05.615 CET [6961:8] LOG: received fast shutdown request
2023-02-01 02:28:05.615 CET [6961:9] LOG: aborting any active transactions
2023-02-01 02:28:05.616 CET [30681:9] LOG: process 30681 releasing ProcSignal slot 33, but it contains 0
TRAP: FailedAssertion("latch->owner_pid == MyProcPid", File: "latch.c", Line: 451, PID: 30681)

The information available in standby2.log shows that 30681 is the
startup process. I am not sure what all that means, yet.

Thoughts or comments welcome.
--
Michael