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The "DROP ACCESS METHOD gist2" test will require locking the index to be dropped and then its table; while most ordinary operations lock a table first then its index. While no concurrent test scripts should be touching fast_emp4000, autovacuum might chance to be processing that table when the DROP runs, resulting in a deadlock failure. This is pretty rare but we see it in the buildfarm from time to time. To fix, acquire a lock on fast_emp4000 before issuing the DROP. Since the point of the exercise is mostly to prevent buildfarm failures, back-patch to 9.6 where this test was introduced. Discussion: https://postgr.es/m/839004.1599185607@sss.pgh.pa.us
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure