{"abstract":"Processed boundary violates retry transition semantics","category":"HTTP retries","checks":7,"contract":"open(stream ID,replayable) records a live stream. goaway(last ID) monotonically lowers the accepted stream boundary. fail(id) retries only replayable streams above the known boundary (known unprocessed), otherwise reports ambiguous; unknown/already-finished streams are ignored. succeed closes a stream. New streams after GOAWAY are blocked. reconnect resets connection boundary and stream IDs while retaining decision history.","evaluation_group":"s3-http_retries-goaway-retry","failed_approach":"The attempted repair changes the faulty site to e[1]<boundary but still violates a regression oracle.","family":"s3-http_retries-goaway-retry-processed-boundary","id":"FA-29776","implementations":{"attempt":{"sha256":"660c8e65554392f7f5b114a9331cb27fb2a76e16031cf2bc514faf304dd33e26","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events):\n    streams={}; boundary=None; out=[]\n    for e in events:\n        if e[0]=='open':\n            if boundary is not None: out.append('draining'); continue\n            if e[1] in streams: out.append('duplicate'); continue\n            streams[e[1]]=[e[2],True]\n        elif e[0]=='goaway':\n            boundary=e[1] if boundary is None else min(boundary,e[1])\n        elif e[0]=='succeed':\n            if e[1] in streams: streams[e[1]][1]=False\n        elif e[0]=='fail':\n            if e[1] not in streams: out.append('unknown'); continue\n            replayable,active=streams[e[1]]\n            if not active: out.append('finished'); continue\n            streams[e[1]][1]=False\n            if boundary is not None and e[1]<boundary:\n                out.append('retry' if replayable else 'unreplayable')\n            else: out.append('ambiguous')\n        elif e[0]=='reconnect':\n            boundary=None\n            streams={}\n    return [out,boundary]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([]), [[],None])\ncheck('1', solve([('open',1,True),('open',1,False),('fail',1),('fail',1),('fail',9)]), [['duplicate','ambiguous','finished','unknown'],None])\ncheck('2', solve([('open',1,True),('open',3,True),('open',5,False),('goaway',3),('fail',1),('fail',3),('fail',5)]), [['ambiguous','ambiguous','unreplayable'],3])\ncheck('3', solve([('open',3,True),('goaway',1),('goaway',5),('fail',3),('open',7,True)]), [['retry','draining'],1])\ncheck('4', solve([('open',1,True),('goaway',0),('open',3,True),('succeed',1),('fail',1)]), [['draining','finished'],0])\ncheck('5', solve([('open',1,True),('goaway',0),('reconnect',),('open',1,False),('goaway',0),('fail',1)]), [['unreplayable'],0])\ncheck('6', solve([('open',N+10,True),('goaway',N+9),('fail',N+10),('fail',N+10)]), [['retry','finished'],N+9])\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":"19b942a116ce9148ea36eae12b61b5214728cd2ae743427361cfd9c4e8f823ff","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events):\n    streams={}; boundary=None; out=[]\n    for e in events:\n        if e[0]=='open':\n            if boundary is not None: out.append('draining'); continue\n            if e[1] in streams: out.append('duplicate'); continue\n            streams[e[1]]=[e[2],True]\n        elif e[0]=='goaway':\n            boundary=e[1] if boundary is None else min(boundary,e[1])\n        elif e[0]=='succeed':\n            if e[1] in streams: streams[e[1]][1]=False\n        elif e[0]=='fail':\n            if e[1] not in streams: out.append('unknown'); continue\n            replayable,active=streams[e[1]]\n            if not active: out.append('finished'); continue\n            streams[e[1]][1]=False\n            if boundary is not None and e[1]>=boundary:\n                out.append('retry' if replayable else 'unreplayable')\n            else: out.append('ambiguous')\n        elif e[0]=='reconnect':\n            boundary=None\n            streams={}\n    return [out,boundary]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([]), [[],None])\ncheck('1', solve([('open',1,True),('open',1,False),('fail',1),('fail',1),('fail',9)]), [['duplicate','ambiguous','finished','unknown'],None])\ncheck('2', solve([('open',1,True),('open',3,True),('open',5,False),('goaway',3),('fail',1),('fail',3),('fail',5)]), [['ambiguous','ambiguous','unreplayable'],3])\ncheck('3', solve([('open',3,True),('goaway',1),('goaway',5),('fail',3),('open',7,True)]), [['retry','draining'],1])\ncheck('4', solve([('open',1,True),('goaway',0),('open',3,True),('succeed',1),('fail',1)]), [['draining','finished'],0])\ncheck('5', solve([('open',1,True),('goaway',0),('reconnect',),('open',1,False),('goaway',0),('fail',1)]), [['unreplayable'],0])\ncheck('6', solve([('open',N+10,True),('goaway',N+9),('fail',N+10),('fail',N+10)]), [['retry','finished'],N+9])\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":"4723427a8c3ffc10cd4309fc9f24d192d5a22e70093f0ca2e3ea467295f396d0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events):\n    streams={}; boundary=None; out=[]\n    for e in events:\n        if e[0]=='open':\n            if boundary is not None: out.append('draining'); continue\n            if e[1] in streams: out.append('duplicate'); continue\n            streams[e[1]]=[e[2],True]\n        elif e[0]=='goaway':\n            boundary=e[1] if boundary is None else min(boundary,e[1])\n        elif e[0]=='succeed':\n            if e[1] in streams: streams[e[1]][1]=False\n        elif e[0]=='fail':\n            if e[1] not in streams: out.append('unknown'); continue\n            replayable,active=streams[e[1]]\n            if not active: out.append('finished'); continue\n            streams[e[1]][1]=False\n            if boundary is not None and e[1]>boundary:\n                out.append('retry' if replayable else 'unreplayable')\n            else: out.append('ambiguous')\n        elif e[0]=='reconnect':\n            boundary=None\n            streams={}\n    return [out,boundary]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([]), [[],None])\ncheck('1', solve([('open',1,True),('open',1,False),('fail',1),('fail',1),('fail',9)]), [['duplicate','ambiguous','finished','unknown'],None])\ncheck('2', solve([('open',1,True),('open',3,True),('open',5,False),('goaway',3),('fail',1),('fail',3),('fail',5)]), [['ambiguous','ambiguous','unreplayable'],3])\ncheck('3', solve([('open',3,True),('goaway',1),('goaway',5),('fail',3),('open',7,True)]), [['retry','draining'],1])\ncheck('4', solve([('open',1,True),('goaway',0),('open',3,True),('succeed',1),('fail',1)]), [['draining','finished'],0])\ncheck('5', solve([('open',1,True),('goaway',0),('reconnect',),('open',1,False),('goaway',0),('fail',1)]), [['unreplayable'],0])\ncheck('6', solve([('open',N+10,True),('goaway',N+9),('fail',N+10),('fail',N+10)]), [['retry','finished'],N+9])\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":"Stipulated bounded simulator, not a complete HTTP implementation or a standards conformance claim. 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":"s3-http_retries-goaway-retry-processed-boundary","generated_at":"2026-09-29T14:41:46.480822+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline deterministic model of HTTP request retries.","repair":"Restore the specified transition e[1]>boundary.","root_cause":"Processed boundary violates retry transition semantics","sha256":"faa70c7ee75704708a1cac438c43e1e0deebe15d08d2841d5ed3b01bc41c6eef","title":"GOAWAY retry admission: Processed boundary violates retry transition semantics · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.307,"exit_code":1,"observations":[{"actual":[[],null],"check":"0","expected":[[],null],"passed":true},{"actual":[["duplicate","ambiguous","finished","unknown"],null],"check":"1","expected":[["duplicate","ambiguous","finished","unknown"],null],"passed":true},{"actual":[["retry","ambiguous","ambiguous"],3],"check":"2","expected":[["ambiguous","ambiguous","unreplayable"],3],"passed":false},{"actual":[["ambiguous","draining"],1],"check":"3","expected":[["retry","draining"],1],"passed":false},{"actual":[["draining","finished"],0],"check":"4","expected":[["draining","finished"],0],"passed":true},{"actual":[["ambiguous"],0],"check":"5","expected":[["unreplayable"],0],"passed":false},{"actual":[["ambiguous","finished"],10],"check":"6","expected":[["retry","finished"],10],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[], null], \"expected\": [[], null], \"passed\": true}, {\"check\": \"1\", \"actual\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"expected\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"passed\": true}, {\"check\": \"2\", \"actual\": [[\"retry\", \"ambiguous\", \"ambiguous\"], 3], \"expected\": [[\"ambiguous\", \"ambiguous\", \"unreplayable\"], 3], \"passed\": false}, {\"check\": \"3\", \"actual\": [[\"ambiguous\", \"draining\"], 1], \"expected\": [[\"retry\", \"draining\"], 1], \"passed\": false}, {\"check\": \"4\", \"actual\": [[\"draining\", \"finished\"], 0], \"expected\": [[\"draining\", \"finished\"], 0], \"passed\": true}, {\"check\": \"5\", \"actual\": [[\"ambiguous\"], 0], \"expected\": [[\"unreplayable\"], 0], \"passed\": false}, {\"check\": \"6\", \"actual\": [[\"ambiguous\", \"finished\"], 10], \"expected\": [[\"retry\", \"finished\"], 10], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":43.413,"exit_code":1,"observations":[{"actual":[[],null],"check":"0","expected":[[],null],"passed":true},{"actual":[["duplicate","ambiguous","finished","unknown"],null],"check":"1","expected":[["duplicate","ambiguous","finished","unknown"],null],"passed":true},{"actual":[["ambiguous","retry","unreplayable"],3],"check":"2","expected":[["ambiguous","ambiguous","unreplayable"],3],"passed":false},{"actual":[["retry","draining"],1],"check":"3","expected":[["retry","draining"],1],"passed":true},{"actual":[["draining","finished"],0],"check":"4","expected":[["draining","finished"],0],"passed":true},{"actual":[["unreplayable"],0],"check":"5","expected":[["unreplayable"],0],"passed":true},{"actual":[["retry","finished"],10],"check":"6","expected":[["retry","finished"],10],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[], null], \"expected\": [[], null], \"passed\": true}, {\"check\": \"1\", \"actual\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"expected\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"passed\": true}, {\"check\": \"2\", \"actual\": [[\"ambiguous\", \"retry\", \"unreplayable\"], 3], \"expected\": [[\"ambiguous\", \"ambiguous\", \"unreplayable\"], 3], \"passed\": false}, {\"check\": \"3\", \"actual\": [[\"retry\", \"draining\"], 1], \"expected\": [[\"retry\", \"draining\"], 1], \"passed\": true}, {\"check\": \"4\", \"actual\": [[\"draining\", \"finished\"], 0], \"expected\": [[\"draining\", \"finished\"], 0], \"passed\": true}, {\"check\": \"5\", \"actual\": [[\"unreplayable\"], 0], \"expected\": [[\"unreplayable\"], 0], \"passed\": true}, {\"check\": \"6\", \"actual\": [[\"retry\", \"finished\"], 10], \"expected\": [[\"retry\", \"finished\"], 10], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.928,"exit_code":0,"observations":[{"actual":[[],null],"check":"0","expected":[[],null],"passed":true},{"actual":[["duplicate","ambiguous","finished","unknown"],null],"check":"1","expected":[["duplicate","ambiguous","finished","unknown"],null],"passed":true},{"actual":[["ambiguous","ambiguous","unreplayable"],3],"check":"2","expected":[["ambiguous","ambiguous","unreplayable"],3],"passed":true},{"actual":[["retry","draining"],1],"check":"3","expected":[["retry","draining"],1],"passed":true},{"actual":[["draining","finished"],0],"check":"4","expected":[["draining","finished"],0],"passed":true},{"actual":[["unreplayable"],0],"check":"5","expected":[["unreplayable"],0],"passed":true},{"actual":[["retry","finished"],10],"check":"6","expected":[["retry","finished"],10],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[], null], \"expected\": [[], null], \"passed\": true}, {\"check\": \"1\", \"actual\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"expected\": [[\"duplicate\", \"ambiguous\", \"finished\", \"unknown\"], null], \"passed\": true}, {\"check\": \"2\", \"actual\": [[\"ambiguous\", \"ambiguous\", \"unreplayable\"], 3], \"expected\": [[\"ambiguous\", \"ambiguous\", \"unreplayable\"], 3], \"passed\": true}, {\"check\": \"3\", \"actual\": [[\"retry\", \"draining\"], 1], \"expected\": [[\"retry\", \"draining\"], 1], \"passed\": true}, {\"check\": \"4\", \"actual\": [[\"draining\", \"finished\"], 0], \"expected\": [[\"draining\", \"finished\"], 0], \"passed\": true}, {\"check\": \"5\", \"actual\": [[\"unreplayable\"], 0], \"expected\": [[\"unreplayable\"], 0], \"passed\": true}, {\"check\": \"6\", \"actual\": [[\"retry\", \"finished\"], 10], \"expected\": [[\"retry\", \"finished\"], 10], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}