{"abstract":"Deque block view overwrites existing pin counts.","category":"Bounded deques","checks":6,"contract":"Create a read-only deque block-range view over a valid half-open block interval. Pin each selected block exactly once, allocate one view identity, and retain the parent owner ID.","evaluation_group":"s3-bounded-deques-block-view-fork","failed_approach":"The partial repair still applies the incorrect transition to an admitted boundary or multi-element case.","family":"s3-bounded-deques-block-view-fork-pin-count","id":"FA-46541","implementations":{"attempt":{"sha256":"4771f6ee4ca0ad0e860dd547d1f9167b56455e70feba681d4989c3341e2730e0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    blocks,refs,start,stop,owner,fresh=x\n    selected=blocks[start:stop]\n    counts=dict(refs)\n    for block in selected:counts[block]=counts[block]+1 if counts[block]==1 else 1\n    view_id=fresh\n    next_id=fresh+1\n    parent=owner\n    writable=False\n    return [selected,counts,view_id,next_id,parent,writable,len(selected)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([[2,4,7],{2:1,4:N,7:2},1,3,8,9]), {1: [[4, 7], {2: 1, 4: 2, 7: 3}, 9, 10, 8, False, 2], 2: [[4, 7], {2: 1, 4: 3, 7: 3}, 9, 10, 8, False, 2], 3: [[4, 7], {2: 1, 4: 4, 7: 3}, 9, 10, 8, False, 2], 4: [[4, 7], {2: 1, 4: 5, 7: 3}, 9, 10, 8, False, 2], 5: [[4, 7], {2: 1, 4: 6, 7: 3}, 9, 10, 8, False, 2]}[N])\ncheck('1', solve([[1],{1:N},0,1,3,6]), {1: [[1], {1: 2}, 6, 7, 3, False, 1], 2: [[1], {1: 3}, 6, 7, 3, False, 1], 3: [[1], {1: 4}, 6, 7, 3, False, 1], 4: [[1], {1: 5}, 6, 7, 3, False, 1], 5: [[1], {1: 6}, 6, 7, 3, False, 1]}[N])\ncheck('2', solve([[2,5],{2:1,5:3},1,1,8,12]), {1: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 2: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 3: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 4: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 5: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0]}[N])\ncheck('3', solve([[],{},0,0,4,7]), {1: [[], {}, 7, 8, 4, False, 0], 2: [[], {}, 7, 8, 4, False, 0], 3: [[], {}, 7, 8, 4, False, 0], 4: [[], {}, 7, 8, 4, False, 0], 5: [[], {}, 7, 8, 4, False, 0]}[N])\ncheck('4', solve([[1,3,6,8],{1:1,3:N,6:2,8:1},1,3,11,14]), {1: [[3, 6], {1: 1, 3: 2, 6: 3, 8: 1}, 14, 15, 11, False, 2], 2: [[3, 6], {1: 1, 3: 3, 6: 3, 8: 1}, 14, 15, 11, False, 2], 3: [[3, 6], {1: 1, 3: 4, 6: 3, 8: 1}, 14, 15, 11, False, 2], 4: [[3, 6], {1: 1, 3: 5, 6: 3, 8: 1}, 14, 15, 11, False, 2], 5: [[3, 6], {1: 1, 3: 6, 6: 3, 8: 1}, 14, 15, 11, False, 2]}[N])\ncheck('5', solve([[2,7],{2:N,7:2},0,2,4,8]), {1: [[2, 7], {2: 2, 7: 3}, 8, 9, 4, False, 2], 2: [[2, 7], {2: 3, 7: 3}, 8, 9, 4, False, 2], 3: [[2, 7], {2: 4, 7: 3}, 8, 9, 4, False, 2], 4: [[2, 7], {2: 5, 7: 3}, 8, 9, 4, False, 2], 5: [[2, 7], {2: 6, 7: 3}, 8, 9, 4, False, 2]}[N])\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":"1ff6dee9c26db8be6d57c520736cbf5dffb4f859db41284eaa7fbe956ec5e541","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    blocks,refs,start,stop,owner,fresh=x\n    selected=blocks[start:stop]\n    counts=dict(refs)\n    for block in selected:counts[block]=1\n    view_id=fresh\n    next_id=fresh+1\n    parent=owner\n    writable=False\n    return [selected,counts,view_id,next_id,parent,writable,len(selected)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([[2,4,7],{2:1,4:N,7:2},1,3,8,9]), {1: [[4, 7], {2: 1, 4: 2, 7: 3}, 9, 10, 8, False, 2], 2: [[4, 7], {2: 1, 4: 3, 7: 3}, 9, 10, 8, False, 2], 3: [[4, 7], {2: 1, 4: 4, 7: 3}, 9, 10, 8, False, 2], 4: [[4, 7], {2: 1, 4: 5, 7: 3}, 9, 10, 8, False, 2], 5: [[4, 7], {2: 1, 4: 6, 7: 3}, 9, 10, 8, False, 2]}[N])\ncheck('1', solve([[1],{1:N},0,1,3,6]), {1: [[1], {1: 2}, 6, 7, 3, False, 1], 2: [[1], {1: 3}, 6, 7, 3, False, 1], 3: [[1], {1: 4}, 6, 7, 3, False, 1], 4: [[1], {1: 5}, 6, 7, 3, False, 1], 5: [[1], {1: 6}, 6, 7, 3, False, 1]}[N])\ncheck('2', solve([[2,5],{2:1,5:3},1,1,8,12]), {1: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 2: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 3: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 4: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 5: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0]}[N])\ncheck('3', solve([[],{},0,0,4,7]), {1: [[], {}, 7, 8, 4, False, 0], 2: [[], {}, 7, 8, 4, False, 0], 3: [[], {}, 7, 8, 4, False, 0], 4: [[], {}, 7, 8, 4, False, 0], 5: [[], {}, 7, 8, 4, False, 0]}[N])\ncheck('4', solve([[1,3,6,8],{1:1,3:N,6:2,8:1},1,3,11,14]), {1: [[3, 6], {1: 1, 3: 2, 6: 3, 8: 1}, 14, 15, 11, False, 2], 2: [[3, 6], {1: 1, 3: 3, 6: 3, 8: 1}, 14, 15, 11, False, 2], 3: [[3, 6], {1: 1, 3: 4, 6: 3, 8: 1}, 14, 15, 11, False, 2], 4: [[3, 6], {1: 1, 3: 5, 6: 3, 8: 1}, 14, 15, 11, False, 2], 5: [[3, 6], {1: 1, 3: 6, 6: 3, 8: 1}, 14, 15, 11, False, 2]}[N])\ncheck('5', solve([[2,7],{2:N,7:2},0,2,4,8]), {1: [[2, 7], {2: 2, 7: 3}, 8, 9, 4, False, 2], 2: [[2, 7], {2: 3, 7: 3}, 8, 9, 4, False, 2], 3: [[2, 7], {2: 4, 7: 3}, 8, 9, 4, False, 2], 4: [[2, 7], {2: 5, 7: 3}, 8, 9, 4, False, 2], 5: [[2, 7], {2: 6, 7: 3}, 8, 9, 4, False, 2]}[N])\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":"8d956068cb510968b7a6190582c2df69ba82421806319bb3d9663c768b619ec9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    blocks,refs,start,stop,owner,fresh=x\n    selected=blocks[start:stop]\n    counts=dict(refs)\n    for block in selected:counts[block]+=1\n    view_id=fresh\n    next_id=fresh+1\n    parent=owner\n    writable=False\n    return [selected,counts,view_id,next_id,parent,writable,len(selected)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('0', solve([[2,4,7],{2:1,4:N,7:2},1,3,8,9]), {1: [[4, 7], {2: 1, 4: 2, 7: 3}, 9, 10, 8, False, 2], 2: [[4, 7], {2: 1, 4: 3, 7: 3}, 9, 10, 8, False, 2], 3: [[4, 7], {2: 1, 4: 4, 7: 3}, 9, 10, 8, False, 2], 4: [[4, 7], {2: 1, 4: 5, 7: 3}, 9, 10, 8, False, 2], 5: [[4, 7], {2: 1, 4: 6, 7: 3}, 9, 10, 8, False, 2]}[N])\ncheck('1', solve([[1],{1:N},0,1,3,6]), {1: [[1], {1: 2}, 6, 7, 3, False, 1], 2: [[1], {1: 3}, 6, 7, 3, False, 1], 3: [[1], {1: 4}, 6, 7, 3, False, 1], 4: [[1], {1: 5}, 6, 7, 3, False, 1], 5: [[1], {1: 6}, 6, 7, 3, False, 1]}[N])\ncheck('2', solve([[2,5],{2:1,5:3},1,1,8,12]), {1: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 2: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 3: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 4: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0], 5: [[], {2: 1, 5: 3}, 12, 13, 8, False, 0]}[N])\ncheck('3', solve([[],{},0,0,4,7]), {1: [[], {}, 7, 8, 4, False, 0], 2: [[], {}, 7, 8, 4, False, 0], 3: [[], {}, 7, 8, 4, False, 0], 4: [[], {}, 7, 8, 4, False, 0], 5: [[], {}, 7, 8, 4, False, 0]}[N])\ncheck('4', solve([[1,3,6,8],{1:1,3:N,6:2,8:1},1,3,11,14]), {1: [[3, 6], {1: 1, 3: 2, 6: 3, 8: 1}, 14, 15, 11, False, 2], 2: [[3, 6], {1: 1, 3: 3, 6: 3, 8: 1}, 14, 15, 11, False, 2], 3: [[3, 6], {1: 1, 3: 4, 6: 3, 8: 1}, 14, 15, 11, False, 2], 4: [[3, 6], {1: 1, 3: 5, 6: 3, 8: 1}, 14, 15, 11, False, 2], 5: [[3, 6], {1: 1, 3: 6, 6: 3, 8: 1}, 14, 15, 11, False, 2]}[N])\ncheck('5', solve([[2,7],{2:N,7:2},0,2,4,8]), {1: [[2, 7], {2: 2, 7: 3}, 8, 9, 4, False, 2], 2: [[2, 7], {2: 3, 7: 3}, 8, 9, 4, False, 2], 3: [[2, 7], {2: 4, 7: 3}, 8, 9, 4, False, 2], 4: [[2, 7], {2: 5, 7: 3}, 8, 9, 4, False, 2], 5: [[2, 7], {2: 6, 7: 3}, 8, 9, 4, False, 2]}[N])\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":"Offline finite deterministic model; no claim of production implementation or concurrent memory-model 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-bounded-deques-block-view-fork-pin-count","generated_at":"2026-09-29T14:44:32.988423+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Controlled bounded deque implementation model with explicit storage and lifecycle observations.","repair":"Restore the documented pin count invariant in block-view-fork.","root_cause":"Deque block view overwrites existing pin counts.","sha256":"ddc88fff630a5ad5ea9d896d238b2c91329e0a12f2741cdf24eae6f31d5aeeed","title":"Deque block view overwrites existing pin counts · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":42.861,"exit_code":1,"observations":[{"actual":[[4,7],{"2":1,"4":2,"7":1},9,10,8,false,2],"check":"0","expected":[[4,7],{"2":1,"4":2,"7":3},9,10,8,false,2],"passed":false},{"actual":[[1],{"1":2},6,7,3,false,1],"check":"1","expected":[[1],{"1":2},6,7,3,false,1],"passed":true},{"actual":[[],{"2":1,"5":3},12,13,8,false,0],"check":"2","expected":[[],{"2":1,"5":3},12,13,8,false,0],"passed":true},{"actual":[[],{},7,8,4,false,0],"check":"3","expected":[[],{},7,8,4,false,0],"passed":true},{"actual":[[3,6],{"1":1,"3":2,"6":1,"8":1},14,15,11,false,2],"check":"4","expected":[[3,6],{"1":1,"3":2,"6":3,"8":1},14,15,11,false,2],"passed":false},{"actual":[[2,7],{"2":2,"7":1},8,9,4,false,2],"check":"5","expected":[[2,7],{"2":2,"7":3},8,9,4,false,2],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[4, 7], {\"2\": 1, \"4\": 2, \"7\": 1}, 9, 10, 8, false, 2], \"expected\": [[4, 7], {\"2\": 1, \"4\": 2, \"7\": 3}, 9, 10, 8, false, 2], \"passed\": false}, {\"check\": \"1\", \"actual\": [[1], {\"1\": 2}, 6, 7, 3, false, 1], \"expected\": [[1], {\"1\": 2}, 6, 7, 3, false, 1], \"passed\": true}, {\"check\": \"2\", \"actual\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"expected\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"passed\": true}, {\"check\": \"3\", \"actual\": [[], {}, 7, 8, 4, false, 0], \"expected\": [[], {}, 7, 8, 4, false, 0], \"passed\": true}, {\"check\": \"4\", \"actual\": [[3, 6], {\"1\": 1, \"3\": 2, \"6\": 1, \"8\": 1}, 14, 15, 11, false, 2], \"expected\": [[3, 6], {\"1\": 1, \"3\": 2, \"6\": 3, \"8\": 1}, 14, 15, 11, false, 2], \"passed\": false}, {\"check\": \"5\", \"actual\": [[2, 7], {\"2\": 2, \"7\": 1}, 8, 9, 4, false, 2], \"expected\": [[2, 7], {\"2\": 2, \"7\": 3}, 8, 9, 4, false, 2], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.019,"exit_code":1,"observations":[{"actual":[[4,7],{"2":1,"4":1,"7":1},9,10,8,false,2],"check":"0","expected":[[4,7],{"2":1,"4":2,"7":3},9,10,8,false,2],"passed":false},{"actual":[[1],{"1":1},6,7,3,false,1],"check":"1","expected":[[1],{"1":2},6,7,3,false,1],"passed":false},{"actual":[[],{"2":1,"5":3},12,13,8,false,0],"check":"2","expected":[[],{"2":1,"5":3},12,13,8,false,0],"passed":true},{"actual":[[],{},7,8,4,false,0],"check":"3","expected":[[],{},7,8,4,false,0],"passed":true},{"actual":[[3,6],{"1":1,"3":1,"6":1,"8":1},14,15,11,false,2],"check":"4","expected":[[3,6],{"1":1,"3":2,"6":3,"8":1},14,15,11,false,2],"passed":false},{"actual":[[2,7],{"2":1,"7":1},8,9,4,false,2],"check":"5","expected":[[2,7],{"2":2,"7":3},8,9,4,false,2],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[4, 7], {\"2\": 1, \"4\": 1, \"7\": 1}, 9, 10, 8, false, 2], \"expected\": [[4, 7], {\"2\": 1, \"4\": 2, \"7\": 3}, 9, 10, 8, false, 2], \"passed\": false}, {\"check\": \"1\", \"actual\": [[1], {\"1\": 1}, 6, 7, 3, false, 1], \"expected\": [[1], {\"1\": 2}, 6, 7, 3, false, 1], \"passed\": false}, {\"check\": \"2\", \"actual\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"expected\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"passed\": true}, {\"check\": \"3\", \"actual\": [[], {}, 7, 8, 4, false, 0], \"expected\": [[], {}, 7, 8, 4, false, 0], \"passed\": true}, {\"check\": \"4\", \"actual\": [[3, 6], {\"1\": 1, \"3\": 1, \"6\": 1, \"8\": 1}, 14, 15, 11, false, 2], \"expected\": [[3, 6], {\"1\": 1, \"3\": 2, \"6\": 3, \"8\": 1}, 14, 15, 11, false, 2], \"passed\": false}, {\"check\": \"5\", \"actual\": [[2, 7], {\"2\": 1, \"7\": 1}, 8, 9, 4, false, 2], \"expected\": [[2, 7], {\"2\": 2, \"7\": 3}, 8, 9, 4, false, 2], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.675,"exit_code":0,"observations":[{"actual":[[4,7],{"2":1,"4":2,"7":3},9,10,8,false,2],"check":"0","expected":[[4,7],{"2":1,"4":2,"7":3},9,10,8,false,2],"passed":true},{"actual":[[1],{"1":2},6,7,3,false,1],"check":"1","expected":[[1],{"1":2},6,7,3,false,1],"passed":true},{"actual":[[],{"2":1,"5":3},12,13,8,false,0],"check":"2","expected":[[],{"2":1,"5":3},12,13,8,false,0],"passed":true},{"actual":[[],{},7,8,4,false,0],"check":"3","expected":[[],{},7,8,4,false,0],"passed":true},{"actual":[[3,6],{"1":1,"3":2,"6":3,"8":1},14,15,11,false,2],"check":"4","expected":[[3,6],{"1":1,"3":2,"6":3,"8":1},14,15,11,false,2],"passed":true},{"actual":[[2,7],{"2":2,"7":3},8,9,4,false,2],"check":"5","expected":[[2,7],{"2":2,"7":3},8,9,4,false,2],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"0\", \"actual\": [[4, 7], {\"2\": 1, \"4\": 2, \"7\": 3}, 9, 10, 8, false, 2], \"expected\": [[4, 7], {\"2\": 1, \"4\": 2, \"7\": 3}, 9, 10, 8, false, 2], \"passed\": true}, {\"check\": \"1\", \"actual\": [[1], {\"1\": 2}, 6, 7, 3, false, 1], \"expected\": [[1], {\"1\": 2}, 6, 7, 3, false, 1], \"passed\": true}, {\"check\": \"2\", \"actual\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"expected\": [[], {\"2\": 1, \"5\": 3}, 12, 13, 8, false, 0], \"passed\": true}, {\"check\": \"3\", \"actual\": [[], {}, 7, 8, 4, false, 0], \"expected\": [[], {}, 7, 8, 4, false, 0], \"passed\": true}, {\"check\": \"4\", \"actual\": [[3, 6], {\"1\": 1, \"3\": 2, \"6\": 3, \"8\": 1}, 14, 15, 11, false, 2], \"expected\": [[3, 6], {\"1\": 1, \"3\": 2, \"6\": 3, \"8\": 1}, 14, 15, 11, false, 2], \"passed\": true}, {\"check\": \"5\", \"actual\": [[2, 7], {\"2\": 2, \"7\": 3}, 8, 9, 4, false, 2], \"expected\": [[2, 7], {\"2\": 2, \"7\": 3}, 8, 9, 4, false, 2], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}