Parsed test spec with 2 sessions

starting permutation: s1u1 s1u2 s1c s2u1 s2u2 s2c
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1c: COMMIT;
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;

starting permutation: s1u1 s1u2 s2u1 s1c s2u2 s2c
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s1c: COMMIT;
step s2u1: <... completed>
ERROR:  could not serialize access due to concurrent update
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
ERROR:  current transaction is aborted, commands ignored until end of transaction block
step s2c: COMMIT;

starting permutation: s1u1 s2u1 s1u2 s2u2 s2c s1c
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;
step s1u2: <... completed>
ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s1u1 s2u1 s2u2 s1u2 s2c s1c
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s2c: COMMIT;
step s1u2: <... completed>
ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s1u1 s2u1 s2u2 s2c s1u2 s1c
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
ERROR:  could not serialize access due to read/write dependencies among transactions
step s1c: COMMIT;

starting permutation: s2u1 s1u1 s1u2 s2u2 s2c s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;
step s1u2: <... completed>
ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s2u1 s1u1 s2u2 s1u2 s2c s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s2c: COMMIT;
step s1u2: <... completed>
ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s2u1 s1u1 s2u2 s2c s1u2 s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
ERROR:  could not serialize access due to read/write dependencies among transactions
step s1c: COMMIT;

starting permutation: s2u1 s2u2 s1u1 s1u2 s2c s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2; <waiting ...>
step s2c: COMMIT;
step s1u2: <... completed>
ERROR:  could not serialize access due to concurrent update
step s1c: COMMIT;

starting permutation: s2u1 s2u2 s1u1 s2c s1u2 s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s2c: COMMIT;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
ERROR:  could not serialize access due to read/write dependencies among transactions
step s1c: COMMIT;

starting permutation: s2u1 s2u2 s2c s1u1 s1u2 s1c
step s2u1: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s2c: COMMIT;
step s1u1: UPDATE A SET Col1 = 1 WHERE AID = 1;
step s1u2: UPDATE B SET Col2 = 1 WHERE BID = 2;
step s1c: COMMIT;