{"abstract":"The workflow timer operation is admitted even though a stale timer wakeup fires a replacement timer.","category":"Workflow orchestration","checks":9,"contract":"Return a Boolean admission decision for fire a durable workflow timer. The record r must satisfy all of: r['fire_time'][0] >= r['fire_time'][1]; r['timer_not_cancelled'] is False; r['timer_generation'][0] == r['timer_generation'][1]; r['workflow_not_terminal'] not in ['completed','failed','cancelled']; r['fire_once'] is False. Extra tracing fields are ignored; validation does not mutate the record.","evaluation_group":"xd-workflow-timer","failed_approach":"Adding the timer generation check repairs the reported defect, but replacing the adjacent workflow not terminal check loses that independent invariant.","family":"xd-workflow-timer-timer_generation","id":"FA-1161","implementations":{"attempt":{"sha256":"e063d2b576eca01a64c9f0ca74726fab4b5f0a81a7d1127b4b73d593865e6134","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['fire_time'][0] >= r['fire_time'][1]) and (r['timer_not_cancelled'] is False) and (r['timer_generation'][0] == r['timer_generation'][1]) and (r['fire_once'] is False)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'fire_time': [20, 20], 'timer_not_cancelled': False, 'timer_generation': [2, 2], 'workflow_not_terminal': 'waiting', 'fire_once': False}\ncheck('valid operation', solve(r), True)\ncheck('A timer fires before its scheduled timestamp', solve(dict(r, **{'fire_time': [19, 20]})), False)\ncheck('A cancelled timer resumes workflow execution', solve(dict(r, **{'timer_not_cancelled': True})), False)\ncheck('A stale timer wakeup fires a replacement timer', solve(dict(r, **{'timer_generation': [1, 2]})), False)\ncheck('A timer reactivates a completed workflow', solve(dict(r, **{'workflow_not_terminal': 'completed'})), False)\ncheck('A retried timer delivery produces another history event', solve(dict(r, **{'fire_once': True})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'fire_time': [19, 20], 'timer_not_cancelled': True, 'timer_generation': [1, 2], 'workflow_not_terminal': 'completed', 'fire_once': True}\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":"991d0f1bfd4465b4d20e0d12132d2e5284c41e7e253d83fb73b3e6a000382283","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['fire_time'][0] >= r['fire_time'][1]) and (r['timer_not_cancelled'] is False) and (r['workflow_not_terminal'] not in ['completed','failed','cancelled']) and (r['fire_once'] is False)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'fire_time': [20, 20], 'timer_not_cancelled': False, 'timer_generation': [2, 2], 'workflow_not_terminal': 'waiting', 'fire_once': False}\ncheck('valid operation', solve(r), True)\ncheck('A timer fires before its scheduled timestamp', solve(dict(r, **{'fire_time': [19, 20]})), False)\ncheck('A cancelled timer resumes workflow execution', solve(dict(r, **{'timer_not_cancelled': True})), False)\ncheck('A stale timer wakeup fires a replacement timer', solve(dict(r, **{'timer_generation': [1, 2]})), False)\ncheck('A timer reactivates a completed workflow', solve(dict(r, **{'workflow_not_terminal': 'completed'})), False)\ncheck('A retried timer delivery produces another history event', solve(dict(r, **{'fire_once': True})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'fire_time': [19, 20], 'timer_not_cancelled': True, 'timer_generation': [1, 2], 'workflow_not_terminal': 'completed', 'fire_once': True}\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":"bb178148be19374f525c9e1703e1426f295a0767738acd9edd1e1ad8ead1b1b7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (r['fire_time'][0] >= r['fire_time'][1]) and (r['timer_not_cancelled'] is False) and (r['timer_generation'][0] == r['timer_generation'][1]) and (r['workflow_not_terminal'] not in ['completed','failed','cancelled']) and (r['fire_once'] is False)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'fire_time': [20, 20], 'timer_not_cancelled': False, 'timer_generation': [2, 2], 'workflow_not_terminal': 'waiting', 'fire_once': False}\ncheck('valid operation', solve(r), True)\ncheck('A timer fires before its scheduled timestamp', solve(dict(r, **{'fire_time': [19, 20]})), False)\ncheck('A cancelled timer resumes workflow execution', solve(dict(r, **{'timer_not_cancelled': True})), False)\ncheck('A stale timer wakeup fires a replacement timer', solve(dict(r, **{'timer_generation': [1, 2]})), False)\ncheck('A timer reactivates a completed workflow', solve(dict(r, **{'workflow_not_terminal': 'completed'})), False)\ncheck('A retried timer delivery produces another history event', solve(dict(r, **{'fire_once': True})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'fire_time': [19, 20], 'timer_not_cancelled': True, 'timer_generation': [1, 2], 'workflow_not_terminal': 'completed', 'fire_once': True}\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-timer-timer_generation","generated_at":"2026-09-29T14:36:59.264127+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['timer_generation'][0] == r['timer_generation'][1] together with every other stated precondition before accepting the operation.","root_cause":"The admission path omits the timer generation invariant while validating the other operation preconditions.","sha256":"e0bae1d323552297c38dc00ca4c9780ea8e152438ede567a32767c62f799d1d5","title":"Fire a durable workflow timer: A stale timer wakeup fires a replacement timer · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":31.483,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A timer fires before its scheduled timestamp","expected":false,"passed":true},{"actual":false,"check":"A cancelled timer resumes workflow execution","expected":false,"passed":true},{"actual":false,"check":"A stale timer wakeup fires a replacement timer","expected":false,"passed":true},{"actual":true,"check":"A timer reactivates a completed workflow","expected":false,"passed":false},{"actual":false,"check":"A retried timer delivery produces another history event","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 timer fires before its scheduled timestamp\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A cancelled timer resumes workflow execution\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A stale timer wakeup fires a replacement timer\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A timer reactivates a completed workflow\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"A retried timer delivery produces another history event\", \"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":31.715,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A timer fires before its scheduled timestamp","expected":false,"passed":true},{"actual":false,"check":"A cancelled timer resumes workflow execution","expected":false,"passed":true},{"actual":true,"check":"A stale timer wakeup fires a replacement timer","expected":false,"passed":false},{"actual":false,"check":"A timer reactivates a completed workflow","expected":false,"passed":true},{"actual":false,"check":"A retried timer delivery produces another history event","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 timer fires before its scheduled timestamp\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A cancelled timer resumes workflow execution\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A stale timer wakeup fires a replacement timer\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"A timer reactivates a completed workflow\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A retried timer delivery produces another history event\", \"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":35.718,"exit_code":0,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A timer fires before its scheduled timestamp","expected":false,"passed":true},{"actual":false,"check":"A cancelled timer resumes workflow execution","expected":false,"passed":true},{"actual":false,"check":"A stale timer wakeup fires a replacement timer","expected":false,"passed":true},{"actual":false,"check":"A timer reactivates a completed workflow","expected":false,"passed":true},{"actual":false,"check":"A retried timer delivery produces another history event","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 timer fires before its scheduled timestamp\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A cancelled timer resumes workflow execution\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A stale timer wakeup fires a replacement timer\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A timer reactivates a completed workflow\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A retried timer delivery produces another history event\", \"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"}