{"abstract":"Failed absolute seek prevents a range read from the stale cursor.","category":"HTTP ranges","checks":6,"contract":"A failed seek yields only an abort operation. Successful seek schedules [read,target,length].","contract_signature":"seek_ok, target, length","evaluation_group":"s3-http_ranges-stream-transfer","failed_approach":"The partial repair uses return [\"read\",target if seek_ok else 0,length], which still violates the stated contract.","family":"s3-http_ranges-stream-seek-failure-stops-read","id":"FA-26606","implementations":{"attempt":{"sha256":"354efff5a742cc50d82acb39370324067a86df37f997930426a2afaf43dbb089","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(seek_ok, target, length):\n    return [\"read\",target if seek_ok else 0,length]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-seek-failure-stops-read fixture 0', solve(False,N,N), [\"abort\"])\ncheck('stream-seek-failure-stops-read fixture 1', solve(False,0,N), [\"abort\"])\ncheck('stream-seek-failure-stops-read fixture 2', solve(True,N,N), [\"read\",N,N])\ncheck('stream-seek-failure-stops-read fixture 3', solve(True,0,0), [\"read\",0,0])\ncheck('stream-seek-failure-stops-read fixture 4', solve(True,2*N,1), [\"read\",2*N,1])\ncheck('stream-seek-failure-stops-read fixture 5', solve(False,N,0), [\"abort\"])\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":"677883184c921c88a2316093c3ad5bf6dcbc1432a9731ba024f8e659f26953b3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(seek_ok, target, length):\n    return [\"read\",target,length]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-seek-failure-stops-read fixture 0', solve(False,N,N), [\"abort\"])\ncheck('stream-seek-failure-stops-read fixture 1', solve(False,0,N), [\"abort\"])\ncheck('stream-seek-failure-stops-read fixture 2', solve(True,N,N), [\"read\",N,N])\ncheck('stream-seek-failure-stops-read fixture 3', solve(True,0,0), [\"read\",0,0])\ncheck('stream-seek-failure-stops-read fixture 4', solve(True,2*N,1), [\"read\",2*N,1])\ncheck('stream-seek-failure-stops-read fixture 5', solve(False,N,0), [\"abort\"])\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":"Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. 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_ranges-stream-seek-failure-stops-read","generated_at":"2026-09-29T14:41:17.531036+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Range responses combine representation identity, conditional requests, framing, and partial-object state.","root_cause":"The stream-seek-failure-stops-read decision uses return [\"read\",target,length].","sha256":"0797fbd5a3d1133a281f4175795d666958384d6ee429424474db29785952525b","title":"Failed absolute seek prevents a range read from the stale cursor · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":42.26,"exit_code":1,"observations":[{"actual":["read",0,1],"check":"stream-seek-failure-stops-read fixture 0","expected":["abort"],"passed":false},{"actual":["read",0,1],"check":"stream-seek-failure-stops-read fixture 1","expected":["abort"],"passed":false},{"actual":["read",1,1],"check":"stream-seek-failure-stops-read fixture 2","expected":["read",1,1],"passed":true},{"actual":["read",0,0],"check":"stream-seek-failure-stops-read fixture 3","expected":["read",0,0],"passed":true},{"actual":["read",2,1],"check":"stream-seek-failure-stops-read fixture 4","expected":["read",2,1],"passed":true},{"actual":["read",0,0],"check":"stream-seek-failure-stops-read fixture 5","expected":["abort"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-seek-failure-stops-read fixture 0\", \"actual\": [\"read\", 0, 1], \"expected\": [\"abort\"], \"passed\": false}, {\"check\": \"stream-seek-failure-stops-read fixture 1\", \"actual\": [\"read\", 0, 1], \"expected\": [\"abort\"], \"passed\": false}, {\"check\": \"stream-seek-failure-stops-read fixture 2\", \"actual\": [\"read\", 1, 1], \"expected\": [\"read\", 1, 1], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 3\", \"actual\": [\"read\", 0, 0], \"expected\": [\"read\", 0, 0], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 4\", \"actual\": [\"read\", 2, 1], \"expected\": [\"read\", 2, 1], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 5\", \"actual\": [\"read\", 0, 0], \"expected\": [\"abort\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.779,"exit_code":1,"observations":[{"actual":["read",1,1],"check":"stream-seek-failure-stops-read fixture 0","expected":["abort"],"passed":false},{"actual":["read",0,1],"check":"stream-seek-failure-stops-read fixture 1","expected":["abort"],"passed":false},{"actual":["read",1,1],"check":"stream-seek-failure-stops-read fixture 2","expected":["read",1,1],"passed":true},{"actual":["read",0,0],"check":"stream-seek-failure-stops-read fixture 3","expected":["read",0,0],"passed":true},{"actual":["read",2,1],"check":"stream-seek-failure-stops-read fixture 4","expected":["read",2,1],"passed":true},{"actual":["read",1,0],"check":"stream-seek-failure-stops-read fixture 5","expected":["abort"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-seek-failure-stops-read fixture 0\", \"actual\": [\"read\", 1, 1], \"expected\": [\"abort\"], \"passed\": false}, {\"check\": \"stream-seek-failure-stops-read fixture 1\", \"actual\": [\"read\", 0, 1], \"expected\": [\"abort\"], \"passed\": false}, {\"check\": \"stream-seek-failure-stops-read fixture 2\", \"actual\": [\"read\", 1, 1], \"expected\": [\"read\", 1, 1], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 3\", \"actual\": [\"read\", 0, 0], \"expected\": [\"read\", 0, 0], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 4\", \"actual\": [\"read\", 2, 1], \"expected\": [\"read\", 2, 1], \"passed\": true}, {\"check\": \"stream-seek-failure-stops-read fixture 5\", \"actual\": [\"read\", 1, 0], \"expected\": [\"abort\"], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}