Parsed test spec with 2 sessions

starting permutation: s1a s1b s1c s2a s2b s2c s2d
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s1b s2a s1c s2b s2c s2d
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2a: BEGIN;
step s1c: COMMIT;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s1b s2a s2b s1c s2c s2d
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s1b s2a s2b s2c s1c s2d
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s1a s2a s1b s1c s2b s2c s2d
step s1a: BEGIN;
step s2a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s2a s1b s2b s1c s2c s2d
step s1a: BEGIN;
step s2a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s2a s1b s2b s2c s1c s2d
step s1a: BEGIN;
step s2a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s1a s2a s2b s1b s1c s2c s2d
step s1a: BEGIN;
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s1a s2a s2b s1b s2c s1c s2d
step s1a: BEGIN;
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s1a s2a s2b s2c s1b s2d s1c
step s1a: BEGIN;
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f(); <waiting ...>
step s2d: COMMIT;
step s1b: <... completed>
step s1c: COMMIT;

starting permutation: s1a s2a s2b s2c s2d s1b s1c
step s1a: BEGIN;
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;

starting permutation: s2a s1a s1b s1c s2b s2c s2d
step s2a: BEGIN;
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s2a s1a s1b s2b s1c s2c s2d
step s2a: BEGIN;
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s2a s1a s1b s2b s2c s1c s2d
step s2a: BEGIN;
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s2a s1a s2b s1b s1c s2c s2d
step s2a: BEGIN;
step s1a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s2a s1a s2b s1b s2c s1c s2d
step s2a: BEGIN;
step s1a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s2a s1a s2b s2c s1b s2d s1c
step s2a: BEGIN;
step s1a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f(); <waiting ...>
step s2d: COMMIT;
step s1b: <... completed>
step s1c: COMMIT;

starting permutation: s2a s1a s2b s2c s2d s1b s1c
step s2a: BEGIN;
step s1a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;

starting permutation: s2a s2b s1a s1b s1c s2c s2d
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;

starting permutation: s2a s2b s1a s1b s2c s1c s2d
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s2c: UPDATE a SET i = 4 WHERE i = 3; <waiting ...>
step s1c: COMMIT;
step s2c: <... completed>
step s2d: COMMIT;

starting permutation: s2a s2b s1a s2c s1b s2d s1c
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1a: BEGIN;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f(); <waiting ...>
step s2d: COMMIT;
step s1b: <... completed>
step s1c: COMMIT;

starting permutation: s2a s2b s1a s2c s2d s1b s1c
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s1a: BEGIN;
step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;

starting permutation: s2a s2b s2c s1a s1b s2d s1c
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f(); <waiting ...>
step s2d: COMMIT;
step s1b: <... completed>
step s1c: COMMIT;

starting permutation: s2a s2b s2c s1a s2d s1b s1c
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s1a: BEGIN;
step s2d: COMMIT;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;

starting permutation: s2a s2b s2c s2d s1a s1b s1c
step s2a: BEGIN;
step s2b: SELECT * FROM a WHERE i = 1 FOR UPDATE;
i
-
1
(1 row)

step s2c: UPDATE a SET i = 4 WHERE i = 3;
step s2d: COMMIT;
step s1a: BEGIN;
step s1b: CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f();
step s1c: COMMIT;