{"abstract":"The decoded time state disagrees with the explicit regression oracle for offset_low.","category":"Time representation","checks":11,"contract":"Four timestamps are ordered by message path: client send c0, server receive s1, server send s2, client receive c3. Constant offset server-minus-client is estimated by symmetric path assumption. Preserve exact half-tick fractions; report network round trip, offset, projected server now, local send/receive server equivalents, one-way path estimate and delay bounds from nonnegative path delays.","contract_signature":"r","evaluation_group":"s3-time-four_timestamp_exchange","failed_approach":"The partial correction still substitutes r['s2'] - r['c0'] at the same fault site.","family":"s3-time_representation-four-timestamp-exchange-offset-low","id":"FA-18006","implementations":{"attempt":{"sha256":"fad4e36188f27f69f8d79b781e6fa6cf1cd9e463e7aad83f53efdc6475fd9949","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom fractions import Fraction\nN = 1\nobservations = []\ndef solve(r):\n    client_span = r['c3'] - r['c0']\n    server_span = r['s2'] - r['s1']\n    round_trip = client_span - server_span\n    offset_low = r['s2'] - r['c0']\n    offset_high = r['s1'] - r['c0']\n    offset = Fraction(offset_low + offset_high,2)\n    projected = r['now'] + offset\n    one_way = Fraction(round_trip,2)\n    valid = round_trip >= 0\n    uncertainty = Fraction(offset_high - offset_low,2)\n    return [valid,str(offset),str(projected),str(one_way),[offset_low,offset_high],str(uncertainty),str(r['c0']+offset),str(r['c3']+offset)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 10}), [True, '5', '15', '2', [3, 7], '2', '5', '11'])\ncheck('fixture 2', solve({'c0': 10, 's1': 9, 's2': 12, 'c3': 18, 'now': 20}), [True, '-7/2', '33/2', '5/2', [-6, -1], '5/2', '13/2', '29/2'])\ncheck('fixture 3', solve({'c0': 0, 's1': 5, 's2': 5, 'c3': 0, 'now': 2}), [True, '5', '7', '0', [5, 5], '0', '5', '5'])\ncheck('fixture 4', solve({'c0': 10, 's1': 10, 's2': 20, 'c3': 15, 'now': 30}), [False, '5/2', '65/2', '-5/2', [5, 0], '-5/2', '25/2', '35/2'])\ncheck('fixture 5', solve({'c0': 20, 's1': 10, 's2': 10, 'c3': 10, 'now': 30}), [False, '-5', '25', '-5', [0, -10], '-5', '15', '5'])\ncheck('fixture 6', solve({'c0': 0, 's1': 1, 's2': 2, 'c3': 4, 'now': 5}), [True, '-1/2', '9/2', '3/2', [-2, 1], '3/2', '-1/2', '7/2'])\ncheck('fixture 7', solve({'c0': -10, 's1': -5, 's2': -3, 'c3': -2, 'now': 0}), [True, '2', '2', '3', [-1, 5], '3', '-8', '0'])\ncheck('fixture 8', solve({'c0': 100, 's1': 150, 's2': 170, 'c3': 140, 'now': 200}), [True, '40', '240', '10', [30, 50], '10', '140', '180'])\ncheck('fixture 9', solve({'c0': 0, 's1': -5, 's2': -3, 'c3': 5, 'now': 10}), [True, '-13/2', '7/2', '3/2', [-8, -5], '3/2', '-13/2', '-3/2'])\ncheck('fixture 10', solve({'c0': 2, 's1': 5, 's2': 5, 'c3': 8, 'now': 10}), [True, '0', '10', '3', [-3, 3], '3', '2', '8'])\nvariant = [({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 11}, [True, '5', '16', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 12}, [True, '5', '17', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 13}, [True, '5', '18', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 14}, [True, '5', '19', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 15}, [True, '5', '20', '2', [3, 7], '2', '5', '11'])]\ncheck(\"variant capture\", solve(variant[N-1][0]), variant[N-1][1])\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":"62569202c48edc09502b60924ae33486cc10d9d02357f1565de7e046909e314b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom fractions import Fraction\nN = 1\nobservations = []\ndef solve(r):\n    client_span = r['c3'] - r['c0']\n    server_span = r['s2'] - r['s1']\n    round_trip = client_span - server_span\n    offset_low = r['s1'] - r['c3']\n    offset_high = r['s1'] - r['c0']\n    offset = Fraction(offset_low + offset_high,2)\n    projected = r['now'] + offset\n    one_way = Fraction(round_trip,2)\n    valid = round_trip >= 0\n    uncertainty = Fraction(offset_high - offset_low,2)\n    return [valid,str(offset),str(projected),str(one_way),[offset_low,offset_high],str(uncertainty),str(r['c0']+offset),str(r['c3']+offset)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 10}), [True, '5', '15', '2', [3, 7], '2', '5', '11'])\ncheck('fixture 2', solve({'c0': 10, 's1': 9, 's2': 12, 'c3': 18, 'now': 20}), [True, '-7/2', '33/2', '5/2', [-6, -1], '5/2', '13/2', '29/2'])\ncheck('fixture 3', solve({'c0': 0, 's1': 5, 's2': 5, 'c3': 0, 'now': 2}), [True, '5', '7', '0', [5, 5], '0', '5', '5'])\ncheck('fixture 4', solve({'c0': 10, 's1': 10, 's2': 20, 'c3': 15, 'now': 30}), [False, '5/2', '65/2', '-5/2', [5, 0], '-5/2', '25/2', '35/2'])\ncheck('fixture 5', solve({'c0': 20, 's1': 10, 's2': 10, 'c3': 10, 'now': 30}), [False, '-5', '25', '-5', [0, -10], '-5', '15', '5'])\ncheck('fixture 6', solve({'c0': 0, 's1': 1, 's2': 2, 'c3': 4, 'now': 5}), [True, '-1/2', '9/2', '3/2', [-2, 1], '3/2', '-1/2', '7/2'])\ncheck('fixture 7', solve({'c0': -10, 's1': -5, 's2': -3, 'c3': -2, 'now': 0}), [True, '2', '2', '3', [-1, 5], '3', '-8', '0'])\ncheck('fixture 8', solve({'c0': 100, 's1': 150, 's2': 170, 'c3': 140, 'now': 200}), [True, '40', '240', '10', [30, 50], '10', '140', '180'])\ncheck('fixture 9', solve({'c0': 0, 's1': -5, 's2': -3, 'c3': 5, 'now': 10}), [True, '-13/2', '7/2', '3/2', [-8, -5], '3/2', '-13/2', '-3/2'])\ncheck('fixture 10', solve({'c0': 2, 's1': 5, 's2': 5, 'c3': 8, 'now': 10}), [True, '0', '10', '3', [-3, 3], '3', '2', '8'])\nvariant = [({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 11}, [True, '5', '16', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 12}, [True, '5', '17', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 13}, [True, '5', '18', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 14}, [True, '5', '19', '2', [3, 7], '2', '5', '11']), ({'c0': 0, 's1': 7, 's2': 9, 'c3': 6, 'now': 15}, [True, '5', '20', '2', [3, 7], '2', '5', '11'])]\ncheck(\"variant capture\", solve(variant[N-1][0]), variant[N-1][1])\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":"Deterministic integer reference model with stipulated units and policies; not a complete clock, wire standard or platform implementation. 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":"s3-time_representation-four-timestamp-exchange-offset-low","generated_at":"2026-09-29T14:39:53.385599+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Clock transfer and timestamp consumers require preserved coordinate, phase, validity and elapsed-time semantics.","root_cause":"Earliest offset bound uses receive rather than server-send causality.","sha256":"714f99ae4623e0e3d14fd011efa8e5824ae216def55e2c58a06e21d20b7fecb7","title":"Earliest offset bound uses receive rather than server-send causality · 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":45.224,"exit_code":1,"observations":[{"actual":[true,"8","18","2",[9,7],"-1","8","14"],"check":"fixture 1","expected":[true,"5","15","2",[3,7],"2","5","11"],"passed":false},{"actual":[true,"1/2","41/2","5/2",[2,-1],"-3/2","21/2","37/2"],"check":"fixture 2","expected":[true,"-7/2","33/2","5/2",[-6,-1],"5/2","13/2","29/2"],"passed":false},{"actual":[true,"5","7","0",[5,5],"0","5","5"],"check":"fixture 3","expected":[true,"5","7","0",[5,5],"0","5","5"],"passed":true},{"actual":[false,"5","35","-5/2",[10,0],"-5","15","20"],"check":"fixture 4","expected":[false,"5/2","65/2","-5/2",[5,0],"-5/2","25/2","35/2"],"passed":false},{"actual":[false,"-10","20","-5",[-10,-10],"0","10","0"],"check":"fixture 5","expected":[false,"-5","25","-5",[0,-10],"-5","15","5"],"passed":false},{"actual":[true,"3/2","13/2","3/2",[2,1],"-1/2","3/2","11/2"],"check":"fixture 6","expected":[true,"-1/2","9/2","3/2",[-2,1],"3/2","-1/2","7/2"],"passed":false},{"actual":[true,"6","6","3",[7,5],"-1","-4","4"],"check":"fixture 7","expected":[true,"2","2","3",[-1,5],"3","-8","0"],"passed":false},{"actual":[true,"60","260","10",[70,50],"-10","160","200"],"check":"fixture 8","expected":[true,"40","240","10",[30,50],"10","140","180"],"passed":false},{"actual":[true,"-4","6","3/2",[-3,-5],"-1","-4","1"],"check":"fixture 9","expected":[true,"-13/2","7/2","3/2",[-8,-5],"3/2","-13/2","-3/2"],"passed":false},{"actual":[true,"3","13","3",[3,3],"0","5","11"],"check":"fixture 10","expected":[true,"0","10","3",[-3,3],"3","2","8"],"passed":false},{"actual":[true,"8","19","2",[9,7],"-1","8","14"],"check":"variant capture","expected":[true,"5","16","2",[3,7],"2","5","11"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [true, \"8\", \"18\", \"2\", [9, 7], \"-1\", \"8\", \"14\"], \"expected\": [true, \"5\", \"15\", \"2\", [3, 7], \"2\", \"5\", \"11\"], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [true, \"1/2\", \"41/2\", \"5/2\", [2, -1], \"-3/2\", \"21/2\", \"37/2\"], \"expected\": [true, \"-7/2\", \"33/2\", \"5/2\", [-6, -1], \"5/2\", \"13/2\", \"29/2\"], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [true, \"5\", \"7\", \"0\", [5, 5], \"0\", \"5\", \"5\"], \"expected\": [true, \"5\", \"7\", \"0\", [5, 5], \"0\", \"5\", \"5\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [false, \"5\", \"35\", \"-5/2\", [10, 0], \"-5\", \"15\", \"20\"], \"expected\": [false, \"5/2\", \"65/2\", \"-5/2\", [5, 0], \"-5/2\", \"25/2\", \"35/2\"], \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": [false, \"-10\", \"20\", \"-5\", [-10, -10], \"0\", \"10\", \"0\"], \"expected\": [false, \"-5\", \"25\", \"-5\", [0, -10], \"-5\", \"15\", \"5\"], \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": [true, \"3/2\", \"13/2\", \"3/2\", [2, 1], \"-1/2\", \"3/2\", \"11/2\"], \"expected\": [true, \"-1/2\", \"9/2\", \"3/2\", [-2, 1], \"3/2\", \"-1/2\", \"7/2\"], \"passed\": false}, {\"check\": \"fixture 7\", \"actual\": [true, \"6\", \"6\", \"3\", [7, 5], \"-1\", \"-4\", \"4\"], \"expected\": [true, \"2\", \"2\", \"3\", [-1, 5], \"3\", \"-8\", \"0\"], \"passed\": false}, {\"check\": \"fixture 8\", \"actual\": [true, \"60\", \"260\", \"10\", [70, 50], \"-10\", \"160\", \"200\"], \"expected\": [true, \"40\", \"240\", \"10\", [30, 50], \"10\", \"140\", \"180\"], \"passed\": false}, {\"check\": \"fixture 9\", \"actual\": [true, \"-4\", \"6\", \"3/2\", [-3, -5], \"-1\", \"-4\", \"1\"], \"expected\": [true, \"-13/2\", \"7/2\", \"3/2\", [-8, -5], \"3/2\", \"-13/2\", \"-3/2\"], \"passed\": false}, {\"check\": \"fixture 10\", \"actual\": [true, \"3\", \"13\", \"3\", [3, 3], \"0\", \"5\", \"11\"], \"expected\": [true, \"0\", \"10\", \"3\", [-3, 3], \"3\", \"2\", \"8\"], \"passed\": false}, {\"check\": \"variant capture\", \"actual\": [true, \"8\", \"19\", \"2\", [9, 7], \"-1\", \"8\", \"14\"], \"expected\": [true, \"5\", \"16\", \"2\", [3, 7], \"2\", \"5\", \"11\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":51.585,"exit_code":1,"observations":[{"actual":[true,"4","14","2",[1,7],"3","4","10"],"check":"fixture 1","expected":[true,"5","15","2",[3,7],"2","5","11"],"passed":false},{"actual":[true,"-5","15","5/2",[-9,-1],"4","5","13"],"check":"fixture 2","expected":[true,"-7/2","33/2","5/2",[-6,-1],"5/2","13/2","29/2"],"passed":false},{"actual":[true,"5","7","0",[5,5],"0","5","5"],"check":"fixture 3","expected":[true,"5","7","0",[5,5],"0","5","5"],"passed":true},{"actual":[false,"-5/2","55/2","-5/2",[-5,0],"5/2","15/2","25/2"],"check":"fixture 4","expected":[false,"5/2","65/2","-5/2",[5,0],"-5/2","25/2","35/2"],"passed":false},{"actual":[false,"-5","25","-5",[0,-10],"-5","15","5"],"check":"fixture 5","expected":[false,"-5","25","-5",[0,-10],"-5","15","5"],"passed":true},{"actual":[true,"-1","4","3/2",[-3,1],"2","-1","3"],"check":"fixture 6","expected":[true,"-1/2","9/2","3/2",[-2,1],"3/2","-1/2","7/2"],"passed":false},{"actual":[true,"1","1","3",[-3,5],"4","-9","-1"],"check":"fixture 7","expected":[true,"2","2","3",[-1,5],"3","-8","0"],"passed":false},{"actual":[true,"30","230","10",[10,50],"20","130","170"],"check":"fixture 8","expected":[true,"40","240","10",[30,50],"10","140","180"],"passed":false},{"actual":[true,"-15/2","5/2","3/2",[-10,-5],"5/2","-15/2","-5/2"],"check":"fixture 9","expected":[true,"-13/2","7/2","3/2",[-8,-5],"3/2","-13/2","-3/2"],"passed":false},{"actual":[true,"0","10","3",[-3,3],"3","2","8"],"check":"fixture 10","expected":[true,"0","10","3",[-3,3],"3","2","8"],"passed":true},{"actual":[true,"4","15","2",[1,7],"3","4","10"],"check":"variant capture","expected":[true,"5","16","2",[3,7],"2","5","11"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [true, \"4\", \"14\", \"2\", [1, 7], \"3\", \"4\", \"10\"], \"expected\": [true, \"5\", \"15\", \"2\", [3, 7], \"2\", \"5\", \"11\"], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [true, \"-5\", \"15\", \"5/2\", [-9, -1], \"4\", \"5\", \"13\"], \"expected\": [true, \"-7/2\", \"33/2\", \"5/2\", [-6, -1], \"5/2\", \"13/2\", \"29/2\"], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [true, \"5\", \"7\", \"0\", [5, 5], \"0\", \"5\", \"5\"], \"expected\": [true, \"5\", \"7\", \"0\", [5, 5], \"0\", \"5\", \"5\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [false, \"-5/2\", \"55/2\", \"-5/2\", [-5, 0], \"5/2\", \"15/2\", \"25/2\"], \"expected\": [false, \"5/2\", \"65/2\", \"-5/2\", [5, 0], \"-5/2\", \"25/2\", \"35/2\"], \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": [false, \"-5\", \"25\", \"-5\", [0, -10], \"-5\", \"15\", \"5\"], \"expected\": [false, \"-5\", \"25\", \"-5\", [0, -10], \"-5\", \"15\", \"5\"], \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": [true, \"-1\", \"4\", \"3/2\", [-3, 1], \"2\", \"-1\", \"3\"], \"expected\": [true, \"-1/2\", \"9/2\", \"3/2\", [-2, 1], \"3/2\", \"-1/2\", \"7/2\"], \"passed\": false}, {\"check\": \"fixture 7\", \"actual\": [true, \"1\", \"1\", \"3\", [-3, 5], \"4\", \"-9\", \"-1\"], \"expected\": [true, \"2\", \"2\", \"3\", [-1, 5], \"3\", \"-8\", \"0\"], \"passed\": false}, {\"check\": \"fixture 8\", \"actual\": [true, \"30\", \"230\", \"10\", [10, 50], \"20\", \"130\", \"170\"], \"expected\": [true, \"40\", \"240\", \"10\", [30, 50], \"10\", \"140\", \"180\"], \"passed\": false}, {\"check\": \"fixture 9\", \"actual\": [true, \"-15/2\", \"5/2\", \"3/2\", [-10, -5], \"5/2\", \"-15/2\", \"-5/2\"], \"expected\": [true, \"-13/2\", \"7/2\", \"3/2\", [-8, -5], \"3/2\", \"-13/2\", \"-3/2\"], \"passed\": false}, {\"check\": \"fixture 10\", \"actual\": [true, \"0\", \"10\", \"3\", [-3, 3], \"3\", \"2\", \"8\"], \"expected\": [true, \"0\", \"10\", \"3\", [-3, 3], \"3\", \"2\", \"8\"], \"passed\": true}, {\"check\": \"variant capture\", \"actual\": [true, \"4\", \"15\", \"2\", [1, 7], \"3\", \"4\", \"10\"], \"expected\": [true, \"5\", \"16\", \"2\", [3, 7], \"2\", \"5\", \"11\"], \"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."}}