{"abstract":"Repeated failures produce a retry delay larger than the configured limit.","category":"Reliability","checks":3,"contract":"Apply the configured upper bound after computing exponential delay.","contract_signature":"base, attempt, cap","evaluation_group":"model-d84170a834ec4717","failed_approach":"Using max turns the cap into a minimum delay.","family":"retry-backoff","id":"FA-041","implementations":{"attempt":{"sha256":"9f7a906698b1c02a1adc449bc5a02576784b45cefc905e936e6893d5e9a06fe6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(base, attempt, cap):\n    return max(cap, base * 2 ** attempt)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('bounded late retry', solve(N, 10, 30), 30)\ncheck('initial retry', solve(N, 0, 30), N)\ncheck('zero base', solve(0, 4, 30), 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":"a8f2c534b55ed70deefcc4bcfae2891091e4404265466eaf432a6bf9e0bea785","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(base, attempt, cap):\n    return base * 2 ** attempt\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('bounded late retry', solve(N, 10, 30), 30)\ncheck('initial retry', solve(N, 0, 30), N)\ncheck('zero base', solve(0, 4, 30), 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":" 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":"retry-backoff","generated_at":"2026-09-29T14:36:49.871824+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A compact reasoning and repair task with executable evidence.","root_cause":"The exponential delay omits the cap or applies a lower bound instead.","sha256":"f494b03c4ed8cdb8c164e27237251de2e479433ad68651d64a4dc7967f61adca","title":"A retry counter produces an unbounded delay · 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":32.568,"exit_code":1,"observations":[{"actual":1024,"check":"bounded late retry","expected":30,"passed":false},{"actual":30,"check":"initial retry","expected":1,"passed":false},{"actual":30,"check":"zero base","expected":0,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"bounded late retry\", \"actual\": 1024, \"expected\": 30, \"passed\": false}, {\"check\": \"initial retry\", \"actual\": 30, \"expected\": 1, \"passed\": false}, {\"check\": \"zero base\", \"actual\": 30, \"expected\": 0, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":34.649,"exit_code":1,"observations":[{"actual":1024,"check":"bounded late retry","expected":30,"passed":false},{"actual":1,"check":"initial retry","expected":1,"passed":true},{"actual":0,"check":"zero base","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"bounded late retry\", \"actual\": 1024, \"expected\": 30, \"passed\": false}, {\"check\": \"initial retry\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"zero base\", \"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."}}