{"abstract":"Quic ack delay is subtracted only up to peer limit.","category":"Multiplexed protocols","checks":4,"contract":"Bounded offline decision model: quic ack delay is subtracted only up to peer limit. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","contract_signature":"rtt, delay, maximum","evaluation_group":"xh-quic-ack-delay-is-subtracted-only-up-to-peer-limit","failed_approach":"The attempted repair uses `rtt` and still violates a separate fixture.","family":"xh-quic-ack-delay-is-subtracted-only-up-to-peer-limit","id":"FA-7576","implementations":{"attempt":{"sha256":"58b5fb2ae8c3a5728779ea65651899ccfb5103f213a77b6c6033f6c17f15addb","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(rtt, delay, maximum):\n    return rtt\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(100, 80, 25), 75)\", \"check('fixture 2', solve(100, 10, 25), 90)\", \"check('fixture 3', solve(10, 25, 25), 0)\", \"check('fixture 4', solve(0, 0, 25), 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":"c57ee4ced452c19be1ce40910a8276810df58b053ef2d9d5754732d5cf123bb0","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(rtt, delay, maximum):\n    return max(0,rtt-delay)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(100, 80, 25), 75)\", \"check('fixture 2', solve(100, 10, 25), 90)\", \"check('fixture 3', solve(10, 25, 25), 0)\", \"check('fixture 4', solve(0, 0, 25), 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-quic-ack-delay-is-subtracted-only-up-to-peer-limit","generated_at":"2026-09-29T14:38:13.379871+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic multiplexed protocols model isolates the quic-ack-delay-is-subtracted-only-up-to-peer-limit policy at a network component boundary.","root_cause":"The faulty implementation uses `max(0,rtt-delay)` for the quic-ack-delay-is-subtracted-only-up-to-peer-limit decision.","sha256":"ec734ca09d1d07019b9c181b08d27df172a266ace7a162440ef4102168114246","title":"Quic ack delay is subtracted only up to peer limit · 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":41.597,"exit_code":1,"observations":[{"actual":100,"check":"fixture 2","expected":90,"passed":false},{"actual":10,"check":"fixture 3","expected":0,"passed":false},{"actual":0,"check":"fixture 4","expected":0,"passed":true},{"actual":100,"check":"fixture 1","expected":75,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 100, \"expected\": 90, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 10, \"expected\": 0, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 100, \"expected\": 75, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.057,"exit_code":1,"observations":[{"actual":90,"check":"fixture 2","expected":90,"passed":true},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":0,"check":"fixture 4","expected":0,"passed":true},{"actual":20,"check":"fixture 1","expected":75,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 90, \"expected\": 90, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 20, \"expected\": 75, \"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."}}