Parsed test spec with 2 sessions starting permutation: s1a s2a s2b s1b s2c step s1a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s2a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s2b: SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1; id data status 2 bar NEW step s1b: COMMIT; step s2c: COMMIT; starting permutation: s2a s1a s2b s1b s2c step s2a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s1a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s2b: SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1; id data status 2 bar NEW step s1b: COMMIT; step s2c: COMMIT; starting permutation: s2a s2b s1a s1b s2c step s2a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s2b: SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1; id data status 1 foo NEW step s1a: SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; id data status 2 bar NEW step s1b: COMMIT; step s2c: COMMIT;