{"abstract":"Rtt estimator weights old and new samples.","category":"Transport flow control","checks":4,"contract":"Bounded offline decision model: rtt estimator weights old and new samples. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","contract_signature":"old, sample, alpha","evaluation_group":"xh-rtt-estimator-weights-old-and-new-samples","failed_approach":"The attempted repair uses `alpha*old+(1-alpha)*sample` and still violates a separate fixture.","family":"xh-rtt-estimator-weights-old-and-new-samples","id":"FA-7256","implementations":{"attempt":{"sha256":"547a01439a74ff6ec51e64f95b12f21c19aaecb84d7e2d39b9646573abbfe80d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(old, sample, alpha):\n    return alpha*old+(1-alpha)*sample\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(10, 30, 0.25), 15)\", \"check('fixture 2', solve(10, 30, 0), 10)\", \"check('fixture 3', solve(10, 30, 1), 30)\", \"check('fixture 4', solve(0, 0, 0.5), 0)\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\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":"c265cc405a1505a632e6f298b13d3925cad30f02796ffee6096ed6f4cc2885b1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(old, sample, alpha):\n    return (old+sample)/2\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(10, 30, 0.25), 15)\", \"check('fixture 2', solve(10, 30, 0), 10)\", \"check('fixture 3', solve(10, 30, 1), 30)\", \"check('fixture 4', solve(0, 0, 0.5), 0)\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\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":"Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. 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":"xh-rtt-estimator-weights-old-and-new-samples","generated_at":"2026-09-29T14:38:09.865700+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic transport flow control model isolates the rtt-estimator-weights-old-and-new-samples policy at a network component boundary.","root_cause":"The faulty implementation uses `(old+sample)/2` for the rtt-estimator-weights-old-and-new-samples decision.","sha256":"4d18bb972f4248d9730fa79c27adb62cba963fa641add1e0a3f6fcc636b8eaa9","title":"Rtt estimator weights old and new samples · 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":47.219,"exit_code":1,"observations":[{"actual":30,"check":"fixture 2","expected":10,"passed":false},{"actual":10,"check":"fixture 3","expected":30,"passed":false},{"actual":0.0,"check":"fixture 4","expected":0,"passed":true},{"actual":25.0,"check":"fixture 1","expected":15,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 30, \"expected\": 10, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 10, \"expected\": 30, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": 0.0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 25.0, \"expected\": 15, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":47.441,"exit_code":1,"observations":[{"actual":20.0,"check":"fixture 2","expected":10,"passed":false},{"actual":20.0,"check":"fixture 3","expected":30,"passed":false},{"actual":0.0,"check":"fixture 4","expected":0,"passed":true},{"actual":20.0,"check":"fixture 1","expected":15,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 20.0, \"expected\": 10, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 20.0, \"expected\": 30, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": 0.0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 20.0, \"expected\": 15, \"passed\": false}], \"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."}}