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The test assumed that advancing WAL would lead to a checkpoint that invalidates the obsolete replication slot. If a checkpoint that started before the WAL switch completes first, the following checkpoint can be skipped as idle, so the expected walsender termination is not logged. Force a CHECKPOINT in a background psql session after advancing WAL, so the slot invalidation is exercised deterministically. This has been observed on buildfarm members alligator and partridge: https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=alligator&dt=2024-12-13%2001%3A24%3A58 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=partridge&dt=2026-08-06%2018%3A00%3A11 Backpatch to all supported versions. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Alexander Lakhin <exclusion@gmail.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/0b07ead5-a5da-445e-9698-a7d340708bdf@gmail.com Backpatch-through: 14