{"abstract":"The workflow heartbeat operation is admitted even though heartbeat renewal extends beyond schedule-to-close timeout.","category":"Workflow orchestration","checks":9,"contract":"Return a Boolean admission decision for renew a durable activity heartbeat. The record r must satisfy all of: r['heartbeat_attempt'][0] == r['heartbeat_attempt'][1]; r['heartbeat_expiry'][0] < r['heartbeat_expiry'][1]; r['progress_monotonic'][0] >= r['progress_monotonic'][1]; len(r['payload_limit'][0]) <= r['payload_limit'][1]; r['absolute_deadline'][0] <= r['absolute_deadline'][1]. Extra tracing fields are ignored; validation does not mutate the record.","evaluation_group":"xd-workflow-heartbeat","failed_approach":"Adding the absolute deadline check repairs the reported defect, but replacing the adjacent heartbeat attempt check loses that independent invariant.","family":"xd-workflow-heartbeat-absolute_deadline","id":"FA-1346","implementations":{"attempt":{"sha256":"43d84aaccb47389d6ccaa3609e6b6ee251eb717f6dbfd729b4f1a6ff8bdc31a6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['heartbeat_expiry'][0] < r['heartbeat_expiry'][1]) and (r['progress_monotonic'][0] >= r['progress_monotonic'][1]) and (len(r['payload_limit'][0]) <= r['payload_limit'][1]) and (r['absolute_deadline'][0] <= r['absolute_deadline'][1])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'heartbeat_attempt': [4, 4], 'heartbeat_expiry': [9, 10], 'progress_monotonic': [20, 19], 'payload_limit': ['abc', 3], 'absolute_deadline': [20, 20]}\ncheck('valid operation', solve(r), True)\ncheck('A previous activity attempt keeps the new attempt alive', solve(dict(r, **{'heartbeat_attempt': [3, 4]})), False)\ncheck('A heartbeat resurrects an activity after its timeout', solve(dict(r, **{'heartbeat_expiry': [10, 10]})), False)\ncheck('A late heartbeat regresses the resumable progress marker', solve(dict(r, **{'progress_monotonic': [18, 19]})), False)\ncheck('Heartbeat detail exceeds durable history payload limits', solve(dict(r, **{'payload_limit': ['abcd', 3]})), False)\ncheck('Heartbeat renewal extends beyond schedule-to-close timeout', solve(dict(r, **{'absolute_deadline': [21, 20]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'heartbeat_attempt': [3, 4], 'heartbeat_expiry': [10, 10], 'progress_monotonic': [18, 19], 'payload_limit': ['abcd', 3], 'absolute_deadline': [21, 20]}\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":"7ab319ba353ec150097ac34072f9d8af099a713603b839efb8a80cd067fa45f0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['heartbeat_attempt'][0] == r['heartbeat_attempt'][1]) and (r['heartbeat_expiry'][0] < r['heartbeat_expiry'][1]) and (r['progress_monotonic'][0] >= r['progress_monotonic'][1]) and (len(r['payload_limit'][0]) <= r['payload_limit'][1])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'heartbeat_attempt': [4, 4], 'heartbeat_expiry': [9, 10], 'progress_monotonic': [20, 19], 'payload_limit': ['abc', 3], 'absolute_deadline': [20, 20]}\ncheck('valid operation', solve(r), True)\ncheck('A previous activity attempt keeps the new attempt alive', solve(dict(r, **{'heartbeat_attempt': [3, 4]})), False)\ncheck('A heartbeat resurrects an activity after its timeout', solve(dict(r, **{'heartbeat_expiry': [10, 10]})), False)\ncheck('A late heartbeat regresses the resumable progress marker', solve(dict(r, **{'progress_monotonic': [18, 19]})), False)\ncheck('Heartbeat detail exceeds durable history payload limits', solve(dict(r, **{'payload_limit': ['abcd', 3]})), False)\ncheck('Heartbeat renewal extends beyond schedule-to-close timeout', solve(dict(r, **{'absolute_deadline': [21, 20]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'heartbeat_attempt': [3, 4], 'heartbeat_expiry': [10, 10], 'progress_monotonic': [18, 19], 'payload_limit': ['abcd', 3], 'absolute_deadline': [21, 20]}\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":"17faf5851470c09d2cd3cc35e2833b151f77e5265564ef5154be3d777697bd23","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['heartbeat_attempt'][0] == r['heartbeat_attempt'][1]) and (r['heartbeat_expiry'][0] < r['heartbeat_expiry'][1]) and (r['progress_monotonic'][0] >= r['progress_monotonic'][1]) and (len(r['payload_limit'][0]) <= r['payload_limit'][1]) and (r['absolute_deadline'][0] <= r['absolute_deadline'][1])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'heartbeat_attempt': [4, 4], 'heartbeat_expiry': [9, 10], 'progress_monotonic': [20, 19], 'payload_limit': ['abc', 3], 'absolute_deadline': [20, 20]}\ncheck('valid operation', solve(r), True)\ncheck('A previous activity attempt keeps the new attempt alive', solve(dict(r, **{'heartbeat_attempt': [3, 4]})), False)\ncheck('A heartbeat resurrects an activity after its timeout', solve(dict(r, **{'heartbeat_expiry': [10, 10]})), False)\ncheck('A late heartbeat regresses the resumable progress marker', solve(dict(r, **{'progress_monotonic': [18, 19]})), False)\ncheck('Heartbeat detail exceeds durable history payload limits', solve(dict(r, **{'payload_limit': ['abcd', 3]})), False)\ncheck('Heartbeat renewal extends beyond schedule-to-close timeout', solve(dict(r, **{'absolute_deadline': [21, 20]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'heartbeat_attempt': [3, 4], 'heartbeat_expiry': [10, 10], 'progress_monotonic': [18, 19], 'payload_limit': ['abcd', 3], 'absolute_deadline': [21, 20]}\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-workflow-heartbeat-absolute_deadline","generated_at":"2026-09-29T14:37:01.486209+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['absolute_deadline'][0] <= r['absolute_deadline'][1] together with every other stated precondition before accepting the operation.","root_cause":"The admission path omits the absolute deadline invariant while validating the other operation preconditions.","sha256":"8f6f7686f006b71be42b386a0430a89895a78745ef7ac9e92155a03016738c09","title":"Renew a durable activity heartbeat: Heartbeat renewal extends beyond schedule-to-close timeout · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":36.72,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":true,"check":"A previous activity attempt keeps the new attempt alive","expected":false,"passed":false},{"actual":false,"check":"A heartbeat resurrects an activity after its timeout","expected":false,"passed":true},{"actual":false,"check":"A late heartbeat regresses the resumable progress marker","expected":false,"passed":true},{"actual":false,"check":"Heartbeat detail exceeds durable history payload limits","expected":false,"passed":true},{"actual":false,"check":"Heartbeat renewal extends beyond schedule-to-close timeout","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\": \"A previous activity attempt keeps the new attempt alive\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"A heartbeat resurrects an activity after its timeout\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A late heartbeat regresses the resumable progress marker\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat detail exceeds durable history payload limits\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat renewal extends beyond schedule-to-close timeout\", \"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"},"broken":{"elapsed_ms":38.291,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A previous activity attempt keeps the new attempt alive","expected":false,"passed":true},{"actual":false,"check":"A heartbeat resurrects an activity after its timeout","expected":false,"passed":true},{"actual":false,"check":"A late heartbeat regresses the resumable progress marker","expected":false,"passed":true},{"actual":false,"check":"Heartbeat detail exceeds durable history payload limits","expected":false,"passed":true},{"actual":true,"check":"Heartbeat renewal extends beyond schedule-to-close timeout","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\": \"A previous activity attempt keeps the new attempt alive\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A heartbeat resurrects an activity after its timeout\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A late heartbeat regresses the resumable progress marker\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat detail exceeds durable history payload limits\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat renewal extends beyond schedule-to-close timeout\", \"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"},"fixed":{"elapsed_ms":36.581,"exit_code":0,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A previous activity attempt keeps the new attempt alive","expected":false,"passed":true},{"actual":false,"check":"A heartbeat resurrects an activity after its timeout","expected":false,"passed":true},{"actual":false,"check":"A late heartbeat regresses the resumable progress marker","expected":false,"passed":true},{"actual":false,"check":"Heartbeat detail exceeds durable history payload limits","expected":false,"passed":true},{"actual":false,"check":"Heartbeat renewal extends beyond schedule-to-close timeout","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\": \"A previous activity attempt keeps the new attempt alive\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A heartbeat resurrects an activity after its timeout\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A late heartbeat regresses the resumable progress marker\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat detail exceeds durable history payload limits\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Heartbeat renewal extends beyond schedule-to-close timeout\", \"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"}