1Parsed test spec with 2 sessions 2 3starting permutation: s2a s1a s2b s2c s2d s2e s1b s2f 4step s2a: SELECT pg_advisory_lock(0); 5pg_advisory_lock 6---------------- 7 8(1 row) 9 10step s1a: SELECT * FROM foo WHERE pg_advisory_lock(0) IS NOT NULL ORDER BY id LIMIT 1 FOR UPDATE SKIP LOCKED; <waiting ...> 11step s2b: UPDATE foo SET data = data WHERE id = 1; 12step s2c: BEGIN; 13step s2d: UPDATE foo SET data = data WHERE id = 1; 14step s2e: SELECT pg_advisory_unlock(0); 15pg_advisory_unlock 16------------------ 17t 18(1 row) 19 20step s1a: <... completed> 21ERROR: could not serialize access due to concurrent update 22step s1b: COMMIT; 23step s2f: COMMIT; 24