{"abstract":"Canceled range streams release snapshot pins and pending data.","category":"HTTP ranges","checks":6,"contract":"pins is the current stream-owned count (0 or1); cancellation clears both pin and pending body, otherwise preserves state.","contract_signature":"cancelled, pins, pending","evaluation_group":"s3-http_ranges-stream-transfer","failed_approach":"The partial repair uses return [0,pending] if cancelled else [pins,pending], which still violates the stated contract.","family":"s3-http_ranges-stream-cancel-releases-pin","id":"FA-26571","implementations":{"attempt":{"sha256":"2e81bc62751d3e0f69d882c6de84ff3183da24e4d2774ab3751afda43a65c7ea","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(cancelled, pins, pending):\n    return [0,pending] if cancelled else [pins,pending]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-cancel-releases-pin fixture 0', solve(True,1,\"p\"*N), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 1', solve(True,0,\"p\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 2', solve(True,1,\"\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 3', solve(False,1,\"p\"*N), [1,\"p\"*N])\ncheck('stream-cancel-releases-pin fixture 4', solve(False,0,\"\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 5', solve(False,0,\"p\"), [0,\"p\"])\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":"86fdc67ed75f7b32311e3968e4488a053e03208d3bb2f004d61fb34ac061e25e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(cancelled, pins, pending):\n    return [pins,\"\"] if cancelled else [pins,pending]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-cancel-releases-pin fixture 0', solve(True,1,\"p\"*N), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 1', solve(True,0,\"p\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 2', solve(True,1,\"\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 3', solve(False,1,\"p\"*N), [1,\"p\"*N])\ncheck('stream-cancel-releases-pin fixture 4', solve(False,0,\"\"), [0,\"\"])\ncheck('stream-cancel-releases-pin fixture 5', solve(False,0,\"p\"), [0,\"p\"])\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-cancel-releases-pin","generated_at":"2026-09-29T14:41:17.184978+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-cancel-releases-pin decision uses return [pins,\"\"] if cancelled else [pins,pending].","sha256":"55aa3a11e610c5477e549905754f9df8078047d30db32ea904fb6c10b44f6211","title":"Canceled range streams release snapshot pins and pending data · 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":37.927,"exit_code":1,"observations":[{"actual":[0,"p"],"check":"stream-cancel-releases-pin fixture 0","expected":[0,""],"passed":false},{"actual":[0,"p"],"check":"stream-cancel-releases-pin fixture 1","expected":[0,""],"passed":false},{"actual":[0,""],"check":"stream-cancel-releases-pin fixture 2","expected":[0,""],"passed":true},{"actual":[1,"p"],"check":"stream-cancel-releases-pin fixture 3","expected":[1,"p"],"passed":true},{"actual":[0,""],"check":"stream-cancel-releases-pin fixture 4","expected":[0,""],"passed":true},{"actual":[0,"p"],"check":"stream-cancel-releases-pin fixture 5","expected":[0,"p"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-cancel-releases-pin fixture 0\", \"actual\": [0, \"p\"], \"expected\": [0, \"\"], \"passed\": false}, {\"check\": \"stream-cancel-releases-pin fixture 1\", \"actual\": [0, \"p\"], \"expected\": [0, \"\"], \"passed\": false}, {\"check\": \"stream-cancel-releases-pin fixture 2\", \"actual\": [0, \"\"], \"expected\": [0, \"\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 3\", \"actual\": [1, \"p\"], \"expected\": [1, \"p\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 4\", \"actual\": [0, \"\"], \"expected\": [0, \"\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 5\", \"actual\": [0, \"p\"], \"expected\": [0, \"p\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.365,"exit_code":1,"observations":[{"actual":[1,""],"check":"stream-cancel-releases-pin fixture 0","expected":[0,""],"passed":false},{"actual":[0,""],"check":"stream-cancel-releases-pin fixture 1","expected":[0,""],"passed":true},{"actual":[1,""],"check":"stream-cancel-releases-pin fixture 2","expected":[0,""],"passed":false},{"actual":[1,"p"],"check":"stream-cancel-releases-pin fixture 3","expected":[1,"p"],"passed":true},{"actual":[0,""],"check":"stream-cancel-releases-pin fixture 4","expected":[0,""],"passed":true},{"actual":[0,"p"],"check":"stream-cancel-releases-pin fixture 5","expected":[0,"p"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-cancel-releases-pin fixture 0\", \"actual\": [1, \"\"], \"expected\": [0, \"\"], \"passed\": false}, {\"check\": \"stream-cancel-releases-pin fixture 1\", \"actual\": [0, \"\"], \"expected\": [0, \"\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 2\", \"actual\": [1, \"\"], \"expected\": [0, \"\"], \"passed\": false}, {\"check\": \"stream-cancel-releases-pin fixture 3\", \"actual\": [1, \"p\"], \"expected\": [1, \"p\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 4\", \"actual\": [0, \"\"], \"expected\": [0, \"\"], \"passed\": true}, {\"check\": \"stream-cancel-releases-pin fixture 5\", \"actual\": [0, \"p\"], \"expected\": [0, \"p\"], \"passed\": true}], \"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."}}