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+Parsed test spec with 2 sessions
+
+starting permutation: s2a s1a s2b s2c s2d s2e s1b s2f
+step s2a: SELECT pg_advisory_lock(0);
+pg_advisory_lock
+----------------
+
+(1 row)
+
+step s1a: SELECT * FROM foo WHERE pg_advisory_lock(0) IS NOT NULL FOR UPDATE NOWAIT; <waiting ...>
+step s2b: UPDATE foo SET data = data;
+step s2c: BEGIN;
+step s2d: UPDATE foo SET data = data;
+step s2e: SELECT pg_advisory_unlock(0);
+pg_advisory_unlock
+------------------
+t
+(1 row)
+
+step s1a: <... completed>
+ERROR: could not obtain lock on row in relation "foo"
+step s1b: COMMIT;
+step s2f: COMMIT;