{"abstract":"Overlapping source pixels are overwritten before they are read.","category":"Raster memory layout","checks":4,"contract":"Copy count pixels between valid possibly overlapping subranges of one row using source snapshot semantics; row length is unchanged.","evaluation_group":"xg-overlapping-row-copy-snapshot","failed_approach":"Swapping source and destination copies in the wrong direction.","family":"xg-overlapping-row-copy-snapshot","id":"FA-10756","implementations":{"attempt":{"sha256":"01ded35e00994870b64ea91322f8385bc8a93be87a9dcabeff1f29a51969b9c0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(row, source, destination, count):\n    return list(row[:source])+list(row[destination:destination+count])+list(row[source+count:])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*([1, 2, 3, 4], 0, 1, 3)), [1, 1, 2, 3])\ncheck('fixture 2', solve(*([1, 2, 3, 4], 1, 0, 3)), [2, 3, 4, 4])\ncheck('fixture 3', solve(*([1, 2], 0, 0, 2)), [1, 2])\ncheck('fixture 4', solve(*([1, 2], 0, 1, 0)), [1, 2])\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":"9563bfe6b1cbb3c097b47f0fe62655492c376e760beffa276dbe14924fe20f20","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(row, source, destination, count):\n    out=list(row)\n    for i in range(count): out[destination+i]=out[source+i]\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*([1, 2, 3, 4], 0, 1, 3)), [1, 1, 2, 3])\ncheck('fixture 2', solve(*([1, 2, 3, 4], 1, 0, 3)), [2, 3, 4, 4])\ncheck('fixture 3', solve(*([1, 2], 0, 0, 2)), [1, 2])\ncheck('fixture 4', solve(*([1, 2], 0, 1, 0)), [1, 2])\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":"88632879474deefca9e46ccef47ce3948188e4144f39f9ef393c4cfa71932c76","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(row, source, destination, count):\n    return list(row[:destination])+list(row[source:source+count])+list(row[destination+count:])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve(*([1, 2, 3, 4], 0, 1, 3)), [1, 1, 2, 3])\ncheck('fixture 2', solve(*([1, 2, 3, 4], 1, 0, 3)), [2, 3, 4, 4])\ncheck('fixture 3', solve(*([1, 2], 0, 0, 2)), [1, 2])\ncheck('fixture 4', solve(*([1, 2], 0, 1, 0)), [1, 2])\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":"xg-overlapping-row-copy-snapshot","generated_at":"2026-09-29T14:38:41.883817+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic software graphics stage with explicit channel and coordinate conventions; no hardware, device profile or API behavior is inferred.","repair":"Use the stage contract: Copy count pixels between valid possibly overlapping subranges of one row using source snapshot semantics; row length is unchanged.","root_cause":"Overlapping source pixels are overwritten before they are read.","sha256":"f066c07a6923f02dc8a21cece0f81f7b05ddf743700e0842bd90eb024c40aea1","title":"Overlapping row copy snapshot · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":37.388,"exit_code":1,"observations":[{"actual":[2,3,4,4],"check":"fixture 1","expected":[1,1,2,3],"passed":false},{"actual":[1,1,2,3],"check":"fixture 2","expected":[2,3,4,4],"passed":false},{"actual":[1,2],"check":"fixture 3","expected":[1,2],"passed":true},{"actual":[1,2],"check":"fixture 4","expected":[1,2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [2, 3, 4, 4], \"expected\": [1, 1, 2, 3], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [1, 1, 2, 3], \"expected\": [2, 3, 4, 4], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":35.476,"exit_code":1,"observations":[{"actual":[1,1,1,1],"check":"fixture 1","expected":[1,1,2,3],"passed":false},{"actual":[2,3,4,4],"check":"fixture 2","expected":[2,3,4,4],"passed":true},{"actual":[1,2],"check":"fixture 3","expected":[1,2],"passed":true},{"actual":[1,2],"check":"fixture 4","expected":[1,2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [1, 1, 1, 1], \"expected\": [1, 1, 2, 3], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [2, 3, 4, 4], \"expected\": [2, 3, 4, 4], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":41.88,"exit_code":0,"observations":[{"actual":[1,1,2,3],"check":"fixture 1","expected":[1,1,2,3],"passed":true},{"actual":[2,3,4,4],"check":"fixture 2","expected":[2,3,4,4],"passed":true},{"actual":[1,2],"check":"fixture 3","expected":[1,2],"passed":true},{"actual":[1,2],"check":"fixture 4","expected":[1,2],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [1, 1, 2, 3], \"expected\": [1, 1, 2, 3], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [2, 3, 4, 4], \"expected\": [2, 3, 4, 4], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}