Hi, While looking for something else, I noticed thorntail has failed twice like this, on REL_12_STABLE:
TRAP: FailedAssertion("!(CritSectionCount == 0 || (context)->allowInCritSection)", File: "/home/nm/farm/sparc64_deb10_gcc_64_ubsan/REL_12_STABLE/pgsql.build/../pgsql/src/backend/utils/mmgr/mcxt.c", Line: 931) In both cases, the last thing that process said was: 2021-05-05 20:25:51.650 MSK [3442631:6] 008_fsm_truncation.pl LOG: received replication command: BASE_BACKUP LABEL 'pg_basebackup base backup' FAST NOWAIT Unfortunately there is no libbacktrace in that release, and for some reason we don't see a core being analysed... (gdb not installed, looking for wrong core file pattern, ...?) https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=thorntail&dt=2021-05-05%2017%3A08%3A00 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=thorntail&dt=2021-04-22%2016%3A59%3A01