{"abstract":"The saga compensation operation is admitted even though compensation overwrites a resource changed by another workflow.","category":"Workflow orchestration","checks":9,"contract":"Return a Boolean admission decision for run a saga compensation action. The record r must satisfy all of: r['forward_committed'] is True; all(r['reverse_dependency']); r['compensation_identity'][0] not in r['compensation_identity'][1]; r['resource_version'][0] == r['resource_version'][1]; r['compensation_registered'] is not None. Extra tracing fields are ignored; validation does not mutate the record.","evaluation_group":"xd-saga-compensation","failed_approach":"Adding the resource version check repairs the reported defect, but replacing the adjacent compensation registered check loses that independent invariant.","family":"xd-saga-compensation-resource_version","id":"FA-1216","implementations":{"attempt":{"sha256":"b337ad4f0fcf9f6cc2f7ae3721940c48b773520a415c756b0286d3d8216f9710","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['forward_committed'] is True) and (all(r['reverse_dependency'])) and (r['compensation_identity'][0] not in r['compensation_identity'][1]) and (r['resource_version'][0] == r['resource_version'][1])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'forward_committed': True, 'reverse_dependency': [True, True], 'compensation_identity': ['c2', ['c1']], 'resource_version': [7, 7], 'compensation_registered': 'release'}\ncheck('valid operation', solve(r), True)\ncheck('Compensation reverses a forward action that never committed', solve(dict(r, **{'forward_committed': False})), False)\ncheck('An upstream step is compensated while dependents remain active', solve(dict(r, **{'reverse_dependency': [True, False]})), False)\ncheck('Retried compensation refunds the same side effect twice', solve(dict(r, **{'compensation_identity': ['c1', ['c1']]})), False)\ncheck('Compensation overwrites a resource changed by another workflow', solve(dict(r, **{'resource_version': [6, 7]})), False)\ncheck('A committed step has no recorded inverse operation', solve(dict(r, **{'compensation_registered': None})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'forward_committed': False, 'reverse_dependency': [True, False], 'compensation_identity': ['c1', ['c1']], 'resource_version': [6, 7], 'compensation_registered': None}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"6ae7a3dd7bbb5d795caaf82ad5bc3296d1c16f065aef5f6e2cd5b1a4910677f3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['forward_committed'] is True) and (all(r['reverse_dependency'])) and (r['compensation_identity'][0] not in r['compensation_identity'][1]) and (r['compensation_registered'] is not None)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'forward_committed': True, 'reverse_dependency': [True, True], 'compensation_identity': ['c2', ['c1']], 'resource_version': [7, 7], 'compensation_registered': 'release'}\ncheck('valid operation', solve(r), True)\ncheck('Compensation reverses a forward action that never committed', solve(dict(r, **{'forward_committed': False})), False)\ncheck('An upstream step is compensated while dependents remain active', solve(dict(r, **{'reverse_dependency': [True, False]})), False)\ncheck('Retried compensation refunds the same side effect twice', solve(dict(r, **{'compensation_identity': ['c1', ['c1']]})), False)\ncheck('Compensation overwrites a resource changed by another workflow', solve(dict(r, **{'resource_version': [6, 7]})), False)\ncheck('A committed step has no recorded inverse operation', solve(dict(r, **{'compensation_registered': None})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'forward_committed': False, 'reverse_dependency': [True, False], 'compensation_identity': ['c1', ['c1']], 'resource_version': [6, 7], 'compensation_registered': None}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"1aca91ff3c565a918f953356c22641b5a095b7e1d16ebe54e4b963edf4ab1429","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['forward_committed'] is True) and (all(r['reverse_dependency'])) and (r['compensation_identity'][0] not in r['compensation_identity'][1]) and (r['resource_version'][0] == r['resource_version'][1]) and (r['compensation_registered'] is not None)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'forward_committed': True, 'reverse_dependency': [True, True], 'compensation_identity': ['c2', ['c1']], 'resource_version': [7, 7], 'compensation_registered': 'release'}\ncheck('valid operation', solve(r), True)\ncheck('Compensation reverses a forward action that never committed', solve(dict(r, **{'forward_committed': False})), False)\ncheck('An upstream step is compensated while dependents remain active', solve(dict(r, **{'reverse_dependency': [True, False]})), False)\ncheck('Retried compensation refunds the same side effect twice', solve(dict(r, **{'compensation_identity': ['c1', ['c1']]})), False)\ncheck('Compensation overwrites a resource changed by another workflow', solve(dict(r, **{'resource_version': [6, 7]})), False)\ncheck('A committed step has no recorded inverse operation', solve(dict(r, **{'compensation_registered': None})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'forward_committed': False, 'reverse_dependency': [True, False], 'compensation_identity': ['c1', ['c1']], 'resource_version': [6, 7], 'compensation_registered': None}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xd-saga-compensation-resource_version","generated_at":"2026-09-29T14:36:59.965679+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic local contract for workflow orchestration. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.","repair":"Require r['resource_version'][0] == r['resource_version'][1] together with every other stated precondition before accepting the operation.","root_cause":"The admission path omits the resource version invariant while validating the other operation preconditions.","sha256":"c5592cd0dd6a89f4c95c372945b1f734280a2f12b3f1c964d4e5456b0b812475","title":"Run a saga compensation action: Compensation overwrites a resource changed by another workflow · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":61.325,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"Compensation reverses a forward action that never committed","expected":false,"passed":true},{"actual":false,"check":"An upstream step is compensated while dependents remain active","expected":false,"passed":true},{"actual":false,"check":"Retried compensation refunds the same side effect twice","expected":false,"passed":true},{"actual":false,"check":"Compensation overwrites a resource changed by another workflow","expected":false,"passed":true},{"actual":true,"check":"A committed step has no recorded inverse operation","expected":false,"passed":false},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"Compensation reverses a forward action that never committed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"An upstream step is compensated while dependents remain active\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Retried compensation refunds the same side effect twice\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Compensation overwrites a resource changed by another workflow\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A committed step has no recorded inverse operation\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":51.874,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"Compensation reverses a forward action that never committed","expected":false,"passed":true},{"actual":false,"check":"An upstream step is compensated while dependents remain active","expected":false,"passed":true},{"actual":false,"check":"Retried compensation refunds the same side effect twice","expected":false,"passed":true},{"actual":true,"check":"Compensation overwrites a resource changed by another workflow","expected":false,"passed":false},{"actual":false,"check":"A committed step has no recorded inverse operation","expected":false,"passed":true},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"Compensation reverses a forward action that never committed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"An upstream step is compensated while dependents remain active\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Retried compensation refunds the same side effect twice\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Compensation overwrites a resource changed by another workflow\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"A committed step has no recorded inverse operation\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":69.35,"exit_code":0,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"Compensation reverses a forward action that never committed","expected":false,"passed":true},{"actual":false,"check":"An upstream step is compensated while dependents remain active","expected":false,"passed":true},{"actual":false,"check":"Retried compensation refunds the same side effect twice","expected":false,"passed":true},{"actual":false,"check":"Compensation overwrites a resource changed by another workflow","expected":false,"passed":true},{"actual":false,"check":"A committed step has no recorded inverse operation","expected":false,"passed":true},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"Compensation reverses a forward action that never committed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"An upstream step is compensated while dependents remain active\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Retried compensation refunds the same side effect twice\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Compensation overwrites a resource changed by another workflow\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A committed step has no recorded inverse operation\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}