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Parsed test spec with 4 sessions
starting permutation: rx1 wx2 c2 wx3 ry3 wy4 rz4 c4 c3 wz1 c1
step rx1: SELECT * FROM t WHERE id = 1000000;
id|txt
-------+---
1000000|
(1 row)
step wx2: UPDATE t SET txt = 'b' WHERE id = 1000000;
step c2: COMMIT;
step wx3: UPDATE t SET txt = 'c' WHERE id = 1000000;
step ry3: SELECT * FROM t WHERE id = 500000;
id|txt
------+---
500000|
(1 row)
step wy4: UPDATE t SET txt = 'd' WHERE id = 500000;
step rz4: SELECT * FROM t WHERE id = 1;
id|txt
--+---
1|
(1 row)
step c4: COMMIT;
step c3: COMMIT;
step wz1: UPDATE t SET txt = 'a' WHERE id = 1;
ERROR: could not serialize access due to read/write dependencies among transactions
step c1: COMMIT;
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