{"abstract":"Negative valid counts trigger Python negative slicing.","category":"PCM sample encoding","checks":8,"contract":"Decode a stipulated fixed-capacity PCM slot whose declared valid prefix is clamped to physical storage; verify zero padding only inside the slot.","evaluation_group":"s3-pcm-pcm-payload-valid-prefix","failed_approach":"Taking absolute value makes malformed negative counts consume samples.","family":"s3-pcm-pcm-payload-valid-prefix-negative-declaration","id":"FA-49191","implementations":{"attempt":{"sha256":"12f42d7682c03f3f5784aba24acdf16909c7a442627ab4d31453e8662b169222","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(packets, capacity):\n    out=[]\n    for declared,payload in packets:\n        used=min(abs(declared),capacity,len(payload))\n        data=list(payload[:used])\n        tail=list(payload[used:capacity])\n        canonical=all(x==0 for x in tail)\n        out.append([data,used,canonical])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4)), [[[1, 2], 2, True], [[1, 2], 2, False]])\ncheck('oracle 2', solve(*([[0, [0, 0]], [-1, [3, 4]]], 2)), [[[], 0, True], [[], 0, False]])\ncheck('oracle 3', solve(*([[5, [1, 2]]], 4)), [[[1, 2], 2, True]])\ncheck('oracle 4', solve(*([[2, [1, 2, 0, 9]]], 3)), [[[1, 2], 2, True]])\ncheck('oracle 5', solve(*([], 4)), [])\ncheck('oracle 6', solve(*([[2, [1, 2]]], 2)), [[[1, 2], 2, True]])\ncheck('oracle 7', solve(*([[8, [1, 2, 3, 4]]], 3)), [[[1, 2, 3], 3, True]])\nif N == 1: check('variant packet 1', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 2: check('variant packet 2', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 3: check('variant packet 3', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 4: check('variant packet 4', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 5: check('variant packet 5', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, 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":"97e156c006329095c2ac4e77c78dd28908955cc621c6c33bf7d9bf9810e25350","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(packets, capacity):\n    out=[]\n    for declared,payload in packets:\n        used=min(declared,capacity,len(payload))\n        data=list(payload[:used])\n        tail=list(payload[used:capacity])\n        canonical=all(x==0 for x in tail)\n        out.append([data,used,canonical])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4)), [[[1, 2], 2, True], [[1, 2], 2, False]])\ncheck('oracle 2', solve(*([[0, [0, 0]], [-1, [3, 4]]], 2)), [[[], 0, True], [[], 0, False]])\ncheck('oracle 3', solve(*([[5, [1, 2]]], 4)), [[[1, 2], 2, True]])\ncheck('oracle 4', solve(*([[2, [1, 2, 0, 9]]], 3)), [[[1, 2], 2, True]])\ncheck('oracle 5', solve(*([], 4)), [])\ncheck('oracle 6', solve(*([[2, [1, 2]]], 2)), [[[1, 2], 2, True]])\ncheck('oracle 7', solve(*([[8, [1, 2, 3, 4]]], 3)), [[[1, 2, 3], 3, True]])\nif N == 1: check('variant packet 1', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 2: check('variant packet 2', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 3: check('variant packet 3', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 4: check('variant packet 4', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 5: check('variant packet 5', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, 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":"58fac89e06d805610ff0dd7a0d75f794020bb267c8750356b573c3625563e5be","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(packets, capacity):\n    out=[]\n    for declared,payload in packets:\n        used=min(max(declared,0),capacity,len(payload))\n        data=list(payload[:used])\n        tail=list(payload[used:capacity])\n        canonical=all(x==0 for x in tail)\n        out.append([data,used,canonical])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4)), [[[1, 2], 2, True], [[1, 2], 2, False]])\ncheck('oracle 2', solve(*([[0, [0, 0]], [-1, [3, 4]]], 2)), [[[], 0, True], [[], 0, False]])\ncheck('oracle 3', solve(*([[5, [1, 2]]], 4)), [[[1, 2], 2, True]])\ncheck('oracle 4', solve(*([[2, [1, 2, 0, 9]]], 3)), [[[1, 2], 2, True]])\ncheck('oracle 5', solve(*([], 4)), [])\ncheck('oracle 6', solve(*([[2, [1, 2]]], 2)), [[[1, 2], 2, True]])\ncheck('oracle 7', solve(*([[8, [1, 2, 3, 4]]], 3)), [[[1, 2, 3], 3, True]])\nif N == 1: check('variant packet 1', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 2: check('variant packet 2', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 3: check('variant packet 3', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 4: check('variant packet 4', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False]])\nif N == 5: check('variant packet 5', solve(*[[[2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]], [2, [1, 2, 0, 0]], [2, [1, 2, 0, 9]]], 4]), [[[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, False], [[1, 2], 2, True], [[1, 2], 2, 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":"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-pcm-payload-valid-prefix-negative-declaration","generated_at":"2026-09-29T14:44:57.679457+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.","repair":"Use the stated conversion contract at negative declaration.","root_cause":"Negative valid counts trigger Python negative slicing.","sha256":"30daaf1dff50e2be844ce29fd0abd707ede461c50e9709cec82ba14ac79c4bed","title":"Pcm payload valid prefix: negative declaration · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":42.121,"exit_code":1,"observations":[{"actual":[[[1,2],2,true],[[1,2],2,false]],"check":"oracle 1","expected":[[[1,2],2,true],[[1,2],2,false]],"passed":true},{"actual":[[[],0,true],[[3],1,false]],"check":"oracle 2","expected":[[[],0,true],[[],0,false]],"passed":false},{"actual":[[[1,2],2,true]],"check":"oracle 3","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 4","expected":[[[1,2],2,true]],"passed":true},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 6","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2,3],3,true]],"check":"oracle 7","expected":[[[1,2,3],3,true]],"passed":true},{"actual":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"check":"variant packet 1","expected":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[[], 0, true], [[3], 1, false]], \"expected\": [[[], 0, true], [[], 0, false]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[[1, 2, 3], 3, true]], \"expected\": [[[1, 2, 3], 3, true]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.43,"exit_code":1,"observations":[{"actual":[[[1,2],2,true],[[1,2],2,false]],"check":"oracle 1","expected":[[[1,2],2,true],[[1,2],2,false]],"passed":true},{"actual":[[[],0,true],[[3],-1,false]],"check":"oracle 2","expected":[[[],0,true],[[],0,false]],"passed":false},{"actual":[[[1,2],2,true]],"check":"oracle 3","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 4","expected":[[[1,2],2,true]],"passed":true},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 6","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2,3],3,true]],"check":"oracle 7","expected":[[[1,2,3],3,true]],"passed":true},{"actual":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"check":"variant packet 1","expected":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[[], 0, true], [[3], -1, false]], \"expected\": [[[], 0, true], [[], 0, false]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[[1, 2, 3], 3, true]], \"expected\": [[[1, 2, 3], 3, true]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":43.595,"exit_code":0,"observations":[{"actual":[[[1,2],2,true],[[1,2],2,false]],"check":"oracle 1","expected":[[[1,2],2,true],[[1,2],2,false]],"passed":true},{"actual":[[[],0,true],[[],0,false]],"check":"oracle 2","expected":[[[],0,true],[[],0,false]],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 3","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 4","expected":[[[1,2],2,true]],"passed":true},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[[[1,2],2,true]],"check":"oracle 6","expected":[[[1,2],2,true]],"passed":true},{"actual":[[[1,2,3],3,true]],"check":"oracle 7","expected":[[[1,2,3],3,true]],"passed":true},{"actual":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"check":"variant packet 1","expected":[[[1,2],2,true],[[1,2],2,false],[[1,2],2,true],[[1,2],2,false]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[[], 0, true], [[], 0, false]], \"expected\": [[[], 0, true], [[], 0, false]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[[1, 2], 2, true]], \"expected\": [[[1, 2], 2, true]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[[1, 2, 3], 3, true]], \"expected\": [[[1, 2, 3], 3, true]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"expected\": [[[1, 2], 2, true], [[1, 2], 2, false], [[1, 2], 2, true], [[1, 2], 2, false]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}