{"abstract":"A single-lane write clobbers the other byte lane.","category":"Digital logic simulation","checks":7,"contract":"Input [depth, mode, ops]; memory holds 16-bit words initialised to 0. Each op [we, addr, wdata, be, re]: be bit k enables byte lane k (bits 8k..8k+7). Addresses outside 0..depth-1 ignore writes and read 'x'. A read in the same cycle as a write returns the old word in mode 'read_first' and the merged new word in 'write_first'. re=0 yields None.","evaluation_group":"w2-digital-logic-simulation-sync-ram","failed_approach":"Shifting without masking treats higher enable bits as enabling lower lanes.","family":"w2-digital-logic-simulation-sync-ram-lane-enable-test","id":"FA-89121","implementations":{"attempt":{"sha256":"4a26ddf6f0f9bb4559f1a870c9e5c2adda99f02457195c0288bef146ba95b929","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(*args):\n    depth, mode, ops = args\n    mem = [0] * depth\n    out = []\n    for we, addr, wdata, be, re in ops:\n        ok = 0 <= addr < depth\n        old = mem[addr] if ok else None\n        new = old\n        if we and ok:\n            for lane in range(2):\n                if be >> lane:\n                    mask = 0xFF << (8 * lane)\n                    new = (new & ~mask) | (wdata & mask)\n            mem[addr] = new\n        if re:\n            if not ok:\n                out.append('x')\n            else:\n                out.append(new if mode == 'write_first' else old)\n        else:\n            out.append(None)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23041, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 8738, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 8738])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23042, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 17476, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 17476])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23043, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 26214, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 26214])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23044, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 34952, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 34952])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23045, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 10, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 43690, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 43690])]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\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":"f8546ec548b31125331226b94d77a9050cc70eed58397507b497d745603217bc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(*args):\n    depth, mode, ops = args\n    mem = [0] * depth\n    out = []\n    for we, addr, wdata, be, re in ops:\n        ok = 0 <= addr < depth\n        old = mem[addr] if ok else None\n        new = old\n        if we and ok:\n            for lane in range(2):\n                if be:\n                    mask = 0xFF << (8 * lane)\n                    new = (new & ~mask) | (wdata & mask)\n            mem[addr] = new\n        if re:\n            if not ok:\n                out.append('x')\n            else:\n                out.append(new if mode == 'write_first' else old)\n        else:\n            out.append(None)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23041, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 8738, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 8738])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23042, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 17476, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 17476])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23043, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 26214, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 26214])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23044, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 34952, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 34952])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23045, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 10, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 43690, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 43690])]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\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":"f0d5972043ded25ba9c633bcf6086565978310e7987deaee77c932edf2717a0f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(*args):\n    depth, mode, ops = args\n    mem = [0] * depth\n    out = []\n    for we, addr, wdata, be, re in ops:\n        ok = 0 <= addr < depth\n        old = mem[addr] if ok else None\n        new = old\n        if we and ok:\n            for lane in range(2):\n                if be >> lane & 1:\n                    mask = 0xFF << (8 * lane)\n                    new = (new & ~mask) | (wdata & mask)\n            mem[addr] = new\n        if re:\n            if not ok:\n                out.append('x')\n            else:\n                out.append(new if mode == 'write_first' else old)\n        else:\n            out.append(None)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23041, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 8738, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 8738])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23042, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 6, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 17476, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 17476])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23043, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 26214, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 26214])], [('full write then read-first read', [4, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [4, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [4, 'read_first', [[1, 3, 23044, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [4, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [4, 'read_first', [[1, -1, 30583, 3, 1], [0, 3, 0, 0, 1]]], ['x', 0]), ('out of range read', [4, 'read_first', [[0, 8, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [4, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 34952, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 34952])], [('full write then read-first read', [5, 'read_first', [[1, 1, 43981, 3, 1], [0, 1, 0, 0, 1]]], [0, 43981]), ('write-first partial write', [5, 'write_first', [[1, 2, 4660, 3, 0], [1, 2, 65535, 1, 1], [0, 2, 0, 0, 1]]], [None, 4863, 4863]), ('high lane only', [5, 'read_first', [[1, 3, 23045, 2, 0], [0, 3, 0, 0, 1]]], [None, 23040]), ('address zero', [5, 'write_first', [[1, 0, 3855, 3, 1], [0, 0, 0, 0, 1]]], [3855, 3855]), ('negative address rejected', [5, 'read_first', [[1, -1, 30583, 3, 1], [0, 4, 0, 0, 1]]], ['x', 0]), ('out of range read', [5, 'read_first', [[0, 10, 0, 0, 1], [0, 1, 0, 0, 0]]], ['x', None]), ('read-first returns old data', [5, 'read_first', [[1, 1, 4369, 3, 0], [1, 1, 43690, 3, 1], [0, 1, 0, 0, 1]]], [None, 4369, 43690])]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\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":"A deterministic bounded teaching model of one simulator rule set; the contract is stipulated and is not a claim of conformance to any HDL standard or commercial simulator. 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":"w2-digital-logic-simulation-sync-ram-lane-enable-test","generated_at":"2026-09-29T14:51:14.483961+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"RTL memory models must match the inferred RAM read-during-write and byte-enable behaviour or simulation diverges from silicon.","repair":"Test bit k of the enable mask for lane k.","root_cause":"The per-lane enable test only checks that some enable bit is set.","sha256":"d0bf793b18d2d29b36f0e3cdabd4deb319f618c92366f779f98ce293e713127b","title":"Any byte enable writes the whole word · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":38.513,"exit_code":1,"observations":[{"actual":[0,43981],"check":"full write then read-first read","expected":[0,43981],"passed":true},{"actual":[null,4863,4863],"check":"write-first partial write","expected":[null,4863,4863],"passed":true},{"actual":[null,23041],"check":"high lane only","expected":[null,23040],"passed":false},{"actual":[3855,3855],"check":"address zero","expected":[3855,3855],"passed":true},{"actual":["x",0],"check":"negative address rejected","expected":["x",0],"passed":true},{"actual":["x",null],"check":"out of range read","expected":["x",null],"passed":true},{"actual":[null,4369,8738],"check":"read-first returns old data","expected":[null,4369,8738],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"full write then read-first read\", \"actual\": [0, 43981], \"expected\": [0, 43981], \"passed\": true}, {\"check\": \"write-first partial write\", \"actual\": [null, 4863, 4863], \"expected\": [null, 4863, 4863], \"passed\": true}, {\"check\": \"high lane only\", \"actual\": [null, 23041], \"expected\": [null, 23040], \"passed\": false}, {\"check\": \"address zero\", \"actual\": [3855, 3855], \"expected\": [3855, 3855], \"passed\": true}, {\"check\": \"negative address rejected\", \"actual\": [\"x\", 0], \"expected\": [\"x\", 0], \"passed\": true}, {\"check\": \"out of range read\", \"actual\": [\"x\", null], \"expected\": [\"x\", null], \"passed\": true}, {\"check\": \"read-first returns old data\", \"actual\": [null, 4369, 8738], \"expected\": [null, 4369, 8738], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.285,"exit_code":1,"observations":[{"actual":[0,43981],"check":"full write then read-first read","expected":[0,43981],"passed":true},{"actual":[null,65535,65535],"check":"write-first partial write","expected":[null,4863,4863],"passed":false},{"actual":[null,23041],"check":"high lane only","expected":[null,23040],"passed":false},{"actual":[3855,3855],"check":"address zero","expected":[3855,3855],"passed":true},{"actual":["x",0],"check":"negative address rejected","expected":["x",0],"passed":true},{"actual":["x",null],"check":"out of range read","expected":["x",null],"passed":true},{"actual":[null,4369,8738],"check":"read-first returns old data","expected":[null,4369,8738],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"full write then read-first read\", \"actual\": [0, 43981], \"expected\": [0, 43981], \"passed\": true}, {\"check\": \"write-first partial write\", \"actual\": [null, 65535, 65535], \"expected\": [null, 4863, 4863], \"passed\": false}, {\"check\": \"high lane only\", \"actual\": [null, 23041], \"expected\": [null, 23040], \"passed\": false}, {\"check\": \"address zero\", \"actual\": [3855, 3855], \"expected\": [3855, 3855], \"passed\": true}, {\"check\": \"negative address rejected\", \"actual\": [\"x\", 0], \"expected\": [\"x\", 0], \"passed\": true}, {\"check\": \"out of range read\", \"actual\": [\"x\", null], \"expected\": [\"x\", null], \"passed\": true}, {\"check\": \"read-first returns old data\", \"actual\": [null, 4369, 8738], \"expected\": [null, 4369, 8738], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":41.31,"exit_code":0,"observations":[{"actual":[0,43981],"check":"full write then read-first read","expected":[0,43981],"passed":true},{"actual":[null,4863,4863],"check":"write-first partial write","expected":[null,4863,4863],"passed":true},{"actual":[null,23040],"check":"high lane only","expected":[null,23040],"passed":true},{"actual":[3855,3855],"check":"address zero","expected":[3855,3855],"passed":true},{"actual":["x",0],"check":"negative address rejected","expected":["x",0],"passed":true},{"actual":["x",null],"check":"out of range read","expected":["x",null],"passed":true},{"actual":[null,4369,8738],"check":"read-first returns old 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