{"abstract":"Tail padding is decoded as additional samples beyond declared count.","category":"PCM sample encoding","checks":8,"contract":"Read up to declared unsigned packed fields after a bit prefix; incomplete fields are ignored, and report cursor in bits from packet start.","contract_signature":"octets, width, count, prefix_bits","evaluation_group":"s3-pcm-subbyte-code-reader","failed_approach":"Limiting every packet to one sample discards valid declared fields.","family":"s3-pcm-subbyte-code-reader-declared-limit","id":"FA-48876","implementations":{"attempt":{"sha256":"a3645e535f9267bac733bcfb230833eb3d72811bc4e5dea3f193d242c73add07","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(octets, width, count, prefix_bits):\n    bits = [(byte >> (7-j)) & 1 for byte in octets for j in range(8)]\n    bits = bits[prefix_bits:]\n    available = len(bits)//width\n    count = min(1,count,available)\n    values=[]\n    for i in range(count):\n        values.append(sum(bits[i*width+j] << (width-1-j) for j in range(width)))\n    consumed = prefix_bits+count*width\n    return [values,consumed]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([179, 144], 3, 3, 2)), [[6, 3, 4], 11])\ncheck('oracle 2', solve(*([255], 2, 2, 0)), [[3, 3], 4])\ncheck('oracle 3', solve(*([0], 1, 8, 0)), [[0, 0, 0, 0, 0, 0, 0, 0], 8])\ncheck('oracle 4', solve(*([], 3, 0, 0)), [[], 0])\ncheck('oracle 5', solve(*([160], 3, 1, 1)), [[2], 4])\ncheck('oracle 6', solve(*([18, 52], 4, 2, 4)), [[2, 3], 12])\ncheck('oracle 7', solve(*([255], 3, 5, 1)), [[7, 7], 7])\nif N == 1: check('variant packet 1', solve(*[[179, 144, 179, 144], 3, 6, 2]), [[6, 3, 4, 4, 1, 3], 20])\nif N == 2: check('variant packet 2', solve(*[[179, 144, 179, 144, 179, 144], 3, 9, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2], 29])\nif N == 3: check('variant packet 3', solve(*[[179, 144, 179, 144, 179, 144, 179, 144], 3, 12, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4], 38])\nif N == 4: check('variant packet 4', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 15, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0], 47])\nif N == 5: check('variant packet 5', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 18, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0, 2, 6, 3], 56])\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":"6b63d5eeff16d57e08de3176dcc1f5d9edf8fc902cff4c2d654ec6fe06f9d2c6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(octets, width, count, prefix_bits):\n    bits = [(byte >> (7-j)) & 1 for byte in octets for j in range(8)]\n    bits = bits[prefix_bits:]\n    available = len(bits)//width\n    count = available\n    values=[]\n    for i in range(count):\n        values.append(sum(bits[i*width+j] << (width-1-j) for j in range(width)))\n    consumed = prefix_bits+count*width\n    return [values,consumed]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([179, 144], 3, 3, 2)), [[6, 3, 4], 11])\ncheck('oracle 2', solve(*([255], 2, 2, 0)), [[3, 3], 4])\ncheck('oracle 3', solve(*([0], 1, 8, 0)), [[0, 0, 0, 0, 0, 0, 0, 0], 8])\ncheck('oracle 4', solve(*([], 3, 0, 0)), [[], 0])\ncheck('oracle 5', solve(*([160], 3, 1, 1)), [[2], 4])\ncheck('oracle 6', solve(*([18, 52], 4, 2, 4)), [[2, 3], 12])\ncheck('oracle 7', solve(*([255], 3, 5, 1)), [[7, 7], 7])\nif N == 1: check('variant packet 1', solve(*[[179, 144, 179, 144], 3, 6, 2]), [[6, 3, 4, 4, 1, 3], 20])\nif N == 2: check('variant packet 2', solve(*[[179, 144, 179, 144, 179, 144], 3, 9, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2], 29])\nif N == 3: check('variant packet 3', solve(*[[179, 144, 179, 144, 179, 144, 179, 144], 3, 12, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4], 38])\nif N == 4: check('variant packet 4', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 15, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0], 47])\nif N == 5: check('variant packet 5', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 18, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0, 2, 6, 3], 56])\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 finite model; no claim of hardware timing or full file-format conformance. 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-pcm-subbyte-code-reader-declared-limit","generated_at":"2026-09-29T14:44:54.777230+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline PCM interchange uses these exact bounded packet and sample representation decisions.","root_cause":"Tail padding is decoded as additional samples beyond declared count.","sha256":"5dd0c6c9983bf70bd575eec87e2281bf4e54d33278f1f578d817bacf6295ad38","title":"Subbyte code reader: declared limit · 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":40.515,"exit_code":1,"observations":[{"actual":[[6],5],"check":"oracle 1","expected":[[6,3,4],11],"passed":false},{"actual":[[3],2],"check":"oracle 2","expected":[[3,3],4],"passed":false},{"actual":[[0],1],"check":"oracle 3","expected":[[0,0,0,0,0,0,0,0],8],"passed":false},{"actual":[[],0],"check":"oracle 4","expected":[[],0],"passed":true},{"actual":[[2],4],"check":"oracle 5","expected":[[2],4],"passed":true},{"actual":[[2],8],"check":"oracle 6","expected":[[2,3],12],"passed":false},{"actual":[[7],4],"check":"oracle 7","expected":[[7,7],7],"passed":false},{"actual":[[6],5],"check":"variant packet 1","expected":[[6,3,4,4,1,3],20],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[6], 5], \"expected\": [[6, 3, 4], 11], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3], 2], \"expected\": [[3, 3], 4], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[0], 1], \"expected\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[2], 4], \"expected\": [[2], 4], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[2], 8], \"expected\": [[2, 3], 12], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[7], 4], \"expected\": [[7, 7], 7], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [[6], 5], \"expected\": [[6, 3, 4, 4, 1, 3], 20], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.4,"exit_code":1,"observations":[{"actual":[[6,3,4,4],14],"check":"oracle 1","expected":[[6,3,4],11],"passed":false},{"actual":[[3,3,3,3],8],"check":"oracle 2","expected":[[3,3],4],"passed":false},{"actual":[[0,0,0,0,0,0,0,0],8],"check":"oracle 3","expected":[[0,0,0,0,0,0,0,0],8],"passed":true},{"actual":[[],0],"check":"oracle 4","expected":[[],0],"passed":true},{"actual":[[2,0],7],"check":"oracle 5","expected":[[2],4],"passed":false},{"actual":[[2,3,4],16],"check":"oracle 6","expected":[[2,3],12],"passed":false},{"actual":[[7,7],7],"check":"oracle 7","expected":[[7,7],7],"passed":true},{"actual":[[6,3,4,4,1,3,1,6,2,0],32],"check":"variant packet 1","expected":[[6,3,4,4,1,3],20],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[6, 3, 4, 4], 14], \"expected\": [[6, 3, 4], 11], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3, 3, 3, 3], 8], \"expected\": [[3, 3], 4], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"expected\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[2, 0], 7], \"expected\": [[2], 4], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[2, 3, 4], 16], \"expected\": [[2, 3], 12], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[7, 7], 7], \"expected\": [[7, 7], 7], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0], 32], \"expected\": [[6, 3, 4, 4, 1, 3], 20], \"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."}}