Parsed test spec with 2 sessions

starting permutation: s1b s2b s1s s2u s2d s1l s2c s1c
step s1b: BEGIN ISOLATION LEVEL REPEATABLE READ;
step s2b: BEGIN;
step s1s: SELECT * FROM foo;
key            value          

1              1              
step s2u: UPDATE foo SET value = 2 WHERE key = 1;
step s2d: DELETE FROM foo;
step s1l: SELECT * FROM foo FOR KEY SHARE; <waiting ...>
step s2c: COMMIT;
step s1l: <... completed>
error in steps s2c s1l: ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s1b s2b s1s s2u s2d s1l s2r s1c
step s1b: BEGIN ISOLATION LEVEL REPEATABLE READ;
step s2b: BEGIN;
step s1s: SELECT * FROM foo;
key            value          

1              1              
step s2u: UPDATE foo SET value = 2 WHERE key = 1;
step s2d: DELETE FROM foo;
step s1l: SELECT * FROM foo FOR KEY SHARE; <waiting ...>
step s2r: ROLLBACK;
step s1l: <... completed>
key            value          

1              1              
step s1c: COMMIT;

starting permutation: s1b s2b s1s s2u s2u2 s1l s2c s1c
step s1b: BEGIN ISOLATION LEVEL REPEATABLE READ;
step s2b: BEGIN;
step s1s: SELECT * FROM foo;
key            value          

1              1              
step s2u: UPDATE foo SET value = 2 WHERE key = 1;
step s2u2: UPDATE foo SET key = 2 WHERE key = 1;
step s1l: SELECT * FROM foo FOR KEY SHARE; <waiting ...>
step s2c: COMMIT;
step s1l: <... completed>
error in steps s2c s1l: ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s1b s2b s1s s2u s2u2 s1l s2r s1c
step s1b: BEGIN ISOLATION LEVEL REPEATABLE READ;
step s2b: BEGIN;
step s1s: SELECT * FROM foo;
key            value          

1              1              
step s2u: UPDATE foo SET value = 2 WHERE key = 1;
step s2u2: UPDATE foo SET key = 2 WHERE key = 1;
step s1l: SELECT * FROM foo FOR KEY SHARE; <waiting ...>
step s2r: ROLLBACK;
step s1l: <... completed>
key            value          

1              1              
step s1c: COMMIT;