Hello Tom,
15.04.2025 05:58, Tom Lane wrote:
In the last day or so, both skink and mamba have hit this
in the pg_rewind test suite [1][2]:
#3 0x01f03f7c in ExceptionalCondition (conditionName=conditionName@entry=0x2119c4c
"pending_since == 0", fileName=fileName@entry=0x2119454 "pgstat.c",
lineNumber=lineNumber@entry=734) at assert.c:66
...
That assert appears to be several years old, and the
008_min_recovery_point.pl test script that's triggering it hasn't
changed very recently either, so I'm baffled where to start digging.
It has the odor of a timing problem, so maybe we just started hitting
this by chance. Still ... anybody have an idea?
[1]
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=skink&dt=2025-04-13%2018%3A55%3A03
[2]
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mamba&dt=2025-04-15%2001%3A00%3A04
FWIW, there was also another test (028_row_filter.pl) failed due to that
assert triggered: [3].
I've managed to reproduce this failure locally when running 10 instances
of 008_min_recovery_point.pl in parallel under Valgrind.
Will try to investigate the issue during this week.
[3]
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=skink&dt=2025-04-11%2007%3A41%3A36
Best regards,
Alexander Lakhin
Neon (https://neon.tech)
