{"abstract":"Automatic takeover counts proportional action twice.","category":"Discrete control systems","checks":6,"contract":"On takeover set I so P+I+F exactly equals the previous manual command; return I. No output limits are modeled.","contract_signature":"manual, proportional, feedforward","evaluation_group":"model-d8ae91780c09151e","failed_approach":"Subtracting proportional action alone leaves a feedforward bump.","family":"z-control_systems-bumpless-tracking","id":"FA-11956","implementations":{"attempt":{"sha256":"4cee6037963be8fe2dbdec320f8f8b3ed532fcf6c2eb25b4d11ddd2444f50c53","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(manual, proportional, feedforward):\n    return manual-proportional\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('all active', solve(10*N, 2*N, N), 7*N)\ncheck('no feedforward', solve(10*N, 2*N, 0), 8*N)\ncheck('negative feedforward', solve(0, N, -2*N), N)\ncheck('negative proportional', solve(N, -N, N), N)\ncheck('zero command', solve(0, N, N), -2*N)\ncheck('all zero', solve(0, 0, 0), 0)\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":"0e8b79b116a288f5a0adeef0486486462dfe6c45150a6cb4c4586d6196cdae3b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(manual, proportional, feedforward):\n    return manual\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('all active', solve(10*N, 2*N, N), 7*N)\ncheck('no feedforward', solve(10*N, 2*N, 0), 8*N)\ncheck('negative feedforward', solve(0, N, -2*N), N)\ncheck('negative proportional', solve(N, -N, N), N)\ncheck('zero command', solve(0, N, N), -2*N)\ncheck('all zero', solve(0, 0, 0), 0)\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":"Integer-valued controlled examples only; no physical plant, stability guarantee, timing jitter, or hardware behavior is modeled. 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":"z-control_systems-bumpless-tracking","generated_at":"2026-09-29T14:38:52.435014+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline discrete controller model isolates this state or arithmetic fault; it makes no physical plant or safety claim.","root_cause":"The integral state is initialized to the manual output directly.","sha256":"f12b73faadc9afda1070c6ab74d278219e73a68e6043ffcf94770d0a14866748","title":"Automatic takeover counts proportional action twice · 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":42.729,"exit_code":1,"observations":[{"actual":8,"check":"all active","expected":7,"passed":false},{"actual":8,"check":"no feedforward","expected":8,"passed":true},{"actual":-1,"check":"negative feedforward","expected":1,"passed":false},{"actual":2,"check":"negative proportional","expected":1,"passed":false},{"actual":-1,"check":"zero command","expected":-2,"passed":false},{"actual":0,"check":"all zero","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"all active\", \"actual\": 8, \"expected\": 7, \"passed\": false}, {\"check\": \"no feedforward\", \"actual\": 8, \"expected\": 8, \"passed\": true}, {\"check\": \"negative feedforward\", \"actual\": -1, \"expected\": 1, \"passed\": false}, {\"check\": \"negative proportional\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"zero command\", \"actual\": -1, \"expected\": -2, \"passed\": false}, {\"check\": \"all zero\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":36.688,"exit_code":1,"observations":[{"actual":10,"check":"all active","expected":7,"passed":false},{"actual":10,"check":"no feedforward","expected":8,"passed":false},{"actual":0,"check":"negative feedforward","expected":1,"passed":false},{"actual":1,"check":"negative proportional","expected":1,"passed":true},{"actual":0,"check":"zero command","expected":-2,"passed":false},{"actual":0,"check":"all zero","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"all active\", \"actual\": 10, \"expected\": 7, \"passed\": false}, {\"check\": \"no feedforward\", \"actual\": 10, \"expected\": 8, \"passed\": false}, {\"check\": \"negative feedforward\", \"actual\": 0, \"expected\": 1, \"passed\": false}, {\"check\": \"negative proportional\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"zero command\", \"actual\": 0, \"expected\": -2, \"passed\": false}, {\"check\": \"all zero\", \"actual\": 0, \"expected\": 0, \"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."}}