{"abstract":"Half close keeps receive direction open.","category":"Connection lifecycle","checks":4,"contract":"Bounded offline decision model: half close keeps receive direction open. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","evaluation_group":"xh-half-close-keeps-receive-direction-open","failed_approach":"The attempted repair uses `(not read_closed,not read_closed)` and still violates a separate fixture.","family":"xh-half-close-keeps-receive-direction-open","id":"FA-7746","implementations":{"attempt":{"sha256":"b048da8f2505ceda3d9125132038461bfc55e3a548181611e3eb32606ae40cd2","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(write_closed, read_closed):\n    return (not read_closed,not read_closed)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, False), (True, False))\", \"check('fixture 2', solve(False, True), (False, True))\", \"check('fixture 3', solve(False, False), (True, True))\", \"check('fixture 4', solve(True, True), (False, False))\"]\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":"0d9604f3aa56684d0245ef2663d07621ec64a4003a6c801edc25b6cb6e71a7e3","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(write_closed, read_closed):\n    return (not write_closed,not write_closed)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, False), (True, False))\", \"check('fixture 2', solve(False, True), (False, True))\", \"check('fixture 3', solve(False, False), (True, True))\", \"check('fixture 4', solve(True, True), (False, False))\"]\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"},"fixed":{"sha256":"92ad52062aea1b7357cf285c5ae8d3428dd142fc885c092c78a2b53746828ba4","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(write_closed, read_closed):\n    return (not read_closed,not write_closed)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, False), (True, False))\", \"check('fixture 2', solve(False, True), (False, True))\", \"check('fixture 3', solve(False, False), (True, True))\", \"check('fixture 4', solve(True, True), (False, False))\"]\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-half-close-keeps-receive-direction-open","generated_at":"2026-09-29T14:38:14.863366+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic connection lifecycle model isolates the half-close-keeps-receive-direction-open policy at a network component boundary.","repair":"Apply the explicit half-close-keeps-receive-direction-open contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `(not write_closed,not write_closed)` for the half-close-keeps-receive-direction-open decision.","sha256":"afbf6ee109e4d8e5606b3aeee1694ca3ac9e9d21ea3746f7585e25313f2a7922","title":"Half close keeps receive direction open · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.053,"exit_code":1,"observations":[{"actual":[false,false],"check":"fixture 2","expected":[false,true],"passed":false},{"actual":[true,true],"check":"fixture 3","expected":[true,true],"passed":true},{"actual":[false,false],"check":"fixture 4","expected":[false,false],"passed":true},{"actual":[true,true],"check":"fixture 1","expected":[true,false],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [false, false], \"expected\": [false, true], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [true, true], \"expected\": [true, true], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [false, false], \"expected\": [false, false], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [true, true], \"expected\": [true, false], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":43.305,"exit_code":1,"observations":[{"actual":[true,true],"check":"fixture 2","expected":[false,true],"passed":false},{"actual":[true,true],"check":"fixture 3","expected":[true,true],"passed":true},{"actual":[false,false],"check":"fixture 4","expected":[false,false],"passed":true},{"actual":[false,false],"check":"fixture 1","expected":[true,false],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [true, true], \"expected\": [false, true], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [true, true], \"expected\": [true, true], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [false, false], \"expected\": [false, false], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [false, false], \"expected\": [true, false], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.233,"exit_code":0,"observations":[{"actual":[false,true],"check":"fixture 2","expected":[false,true],"passed":true},{"actual":[true,true],"check":"fixture 3","expected":[true,true],"passed":true},{"actual":[false,false],"check":"fixture 4","expected":[false,false],"passed":true},{"actual":[true,false],"check":"fixture 1","expected":[true,false],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [false, true], \"expected\": [false, true], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [true, true], \"expected\": [true, true], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [false, false], \"expected\": [false, false], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [true, false], \"expected\": [true, false], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}