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. regards, tom lane