Hello Tom and Michael,
29.04.2024 08:11, Tom Lane wrote:
Michael Paquier <mich...@paquier.xyz> writes:
If you grep the source tree, you'd notice that a prepared transaction
named gxid only exists in the 2PC tests of ECPG, in
src/interfaces/ecpg/test/sql/twophase.pgc. So the origin of the
failure comes from a race condition due to test parallelization,
because the scan of pg_prepared_xacts affects all databases with
installcheck, and in your case it means that the scan of
pg_prepared_xacts was running in parallel of the ECPG tests with an
installcheck.
Up to now, we've only worried about whether tests running in parallel
within a single test suite can interact. It's quite scary to think
that the meson setup has expanded the possibility of interactions
to our entire source tree. Maybe that was a bad idea and we should
fix the meson infrastructure to not do that. I fear that otherwise,
we'll get bit regularly by very-low-probability bugs of this kind.
Yes, I'm afraid of the same. For example, the test failure [1] is of that
ilk, I guess.
[1]
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=rorqual&dt=2024-04-17%2016%3A33%3A23
Best regards,
Alexander
