{"abstract":"Resetting the cursor retains samples from the previous stream incarnation.","category":"Audio playback scheduling","checks":4,"contract":"Resetting playback clears incomplete frame carry and cursor together; without reset preserve both.","contract_signature":"carry, position, resetting","evaluation_group":"xaud-stream-reset-discards-old-carry","failed_approach":"Unconditional reset clears carry and progress during ordinary playback.","family":"xaud-stream-reset-discards-old-carry","id":"FA-11001","implementations":{"attempt":{"sha256":"39ce11cf29387e95ea62e2e8846f28dd50f8c2ecb78effa52ec21a258a49dd47","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(carry, position, resetting):\n    return [[],0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([1], 8, True)),[[], 0])\ncheck('fixture 2',solve(*([1], 8, False)),[[1], 8])\ncheck('fixture 3',solve(*([], 0, True)),[[], 0])\ncheck('fixture 4',solve(*([2, 3], 4, False)),[[2, 3], 4])\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":"18f1aaa879a720640952b0b03e1f96be87edc509b00a57598ffd2cfcf4ebdb81","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(carry, position, resetting):\n    return [list(carry),0] if resetting else [list(carry),position]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([1], 8, True)),[[], 0])\ncheck('fixture 2',solve(*([1], 8, False)),[[1], 8])\ncheck('fixture 3',solve(*([], 0, True)),[[], 0])\ncheck('fixture 4',solve(*([2, 3], 4, False)),[[2, 3], 4])\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":" 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":"xaud-stream-reset-discards-old-carry","generated_at":"2026-09-29T14:38:44.134957+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A pure Python local audio pipeline stage with explicit sample formats and frame conventions; no real-time device or signal-spectrum claims.","root_cause":"Resetting the cursor retains samples from the previous stream incarnation.","sha256":"961441f5bdaee6f3ae368d8535aa4813824cc489112a402c7818d4e651cfdc30","title":"Stream reset discards old carry · 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":38.689,"exit_code":1,"observations":[{"actual":[[],0],"check":"fixture 1","expected":[[],0],"passed":true},{"actual":[[],0],"check":"fixture 2","expected":[[1],8],"passed":false},{"actual":[[],0],"check":"fixture 3","expected":[[],0],"passed":true},{"actual":[[],0],"check":"fixture 4","expected":[[2,3],4],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [[], 0], \"expected\": [[1], 8], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [[], 0], \"expected\": [[2, 3], 4], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.306,"exit_code":1,"observations":[{"actual":[[1],0],"check":"fixture 1","expected":[[],0],"passed":false},{"actual":[[1],8],"check":"fixture 2","expected":[[1],8],"passed":true},{"actual":[[],0],"check":"fixture 3","expected":[[],0],"passed":true},{"actual":[[2,3],4],"check":"fixture 4","expected":[[2,3],4],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [[1], 0], \"expected\": [[], 0], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [[1], 8], \"expected\": [[1], 8], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [[2, 3], 4], \"expected\": [[2, 3], 4], \"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."}}