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See also afdeff10526. Failures after that commit provided a few more hints, but not yet enough to understand what's going on. In 019_replslot_limit.pl shut down nodes with fast instead of immediate mode if we observe the failure mode. That should tell us whether the failures we're observing are just a timing issue under high load. PGCTLTIMEOUT should prevent buildfarm animals from hanging endlessly. Also adds a bit more logging to replication slot drop and ShutdownPostgres(). Discussion: https://postgr.es/m/20220225192941.hqnvefgdzaro6gzg@alap3.anarazel.de
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