{"abstract":"Rotations made in the manager revert after an export that touched both files within one second.","category":"Image orientation metadata","checks":8,"contract":"A photo manager reconciles the embedded orientation with an XMP sidecar. Values are valid if they are integers 1..8 or strings that are exactly one digit 1..8 after trimming. Policy \"sidecar\" prefers the sidecar, \"embedded\" prefers the file, and \"newest\" (also used for unknown policies) prefers the sidecar when both are valid and sidecar_mtime >= file_mtime; the other valid value is the fallback, then 1.","contract_signature":"d","evaluation_group":"w2-image-orientation-metadata-sidecar-reconciliation","failed_approach":"Requiring a margin of more than a second makes the sidecar lose even more often.","family":"w2-image-orientation-metadata-sidecar-reconciliation-mtime-tie","id":"FA-79316","implementations":{"attempt":{"sha256":"483e6f2243891aac299d3a6c9639ef4676cb65c62bac926aa622cea26f5be715","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(d):\n    def ok(v):\n        if isinstance(v, str) and v.strip() in ('1', '2', '3', '4', '5', '6', '7', '8'):\n            return int(v.strip())\n        if isinstance(v, int) and not isinstance(v, bool) and 1 <= v <= 8:\n            return v\n        return None\n    e = ok(d.get('embedded'))\n    s = ok(d.get('sidecar'))\n    pol = d.get('policy')\n    if pol not in ('newest', 'sidecar', 'embedded'):\n        pol = 'newest'\n    if pol == 'sidecar':\n        order = [s, e]\n    elif pol == 'embedded':\n        order = [e, s]\n    elif s is not None and e is not None:\n        order = [s, e] if d['sidecar_mtime'] - d['file_mtime'] > 1 else [e, s]\n    else:\n        order = [s, e]\n    for v in order:\n        if v is not None:\n            return v\n    return 1\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[{'embedded': ' 8', 'sidecar': 5, 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'newest'}, 5], [{'embedded': 3, 'sidecar': ' 8', 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'latest'}, 8], [{'embedded': 5, 'sidecar': '+3', 'file_mtime': 103, 'sidecar_mtime': 108, 'policy': 'newest'}, 5], [{'embedded': 'x', 'sidecar': 'x', 'file_mtime': 109, 'sidecar_mtime': 109, 'policy': 'embedded'}, 1], [{'embedded': 8, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 101, 'policy': 'newest'}, 8], [{'embedded': 9, 'sidecar': 9, 'file_mtime': 108, 'sidecar_mtime': 109, 'policy': None}, 1], [{'embedded': '06', 'sidecar': None, 'file_mtime': 101, 'sidecar_mtime': 100, 'policy': 'embedded'}, 1], [{'embedded': '6', 'sidecar': 5, 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': None}, 5]], [[{'embedded': ' 8', 'sidecar': 5, 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': None}, 5], [{'embedded': 5, 'sidecar': ' 8', 'file_mtime': 104, 'sidecar_mtime': 105, 'policy': 'newest'}, 8], [{'embedded': 3, 'sidecar': None, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'embedded'}, 3], [{'embedded': 1, 'sidecar': '06', 'file_mtime': 104, 'sidecar_mtime': 105, 'policy': 'sidecar'}, 1], [{'embedded': ' 8', 'sidecar': 8, 'file_mtime': 107, 'sidecar_mtime': 112, 'policy': 'embedded'}, 8], [{'embedded': 3, 'sidecar': 6, 'file_mtime': 101, 'sidecar_mtime': 96, 'policy': 'sidecar'}, 6], [{'embedded': 3, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 103, 'policy': 'newest'}, 3], [{'embedded': 3, 'sidecar': 8, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'latest'}, 8]], [[{'embedded': ' 8', 'sidecar': 3, 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': None}, 3], [{'embedded': 8, 'sidecar': '6', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': None}, 6], [{'embedded': None, 'sidecar': '06', 'file_mtime': 110, 'sidecar_mtime': 115, 'policy': 'newest'}, 1], [{'embedded': 3, 'sidecar': '+3', 'file_mtime': 109, 'sidecar_mtime': 114, 'policy': None}, 3], [{'embedded': 'x', 'sidecar': ' 8', 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': 'sidecar'}, 8], [{'embedded': 5, 'sidecar': 9, 'file_mtime': 105, 'sidecar_mtime': 110, 'policy': 'latest'}, 5], [{'embedded': ' 8', 'sidecar': '06', 'file_mtime': 100, 'sidecar_mtime': 101, 'policy': 'newest'}, 8], [{'embedded': 8, 'sidecar': 1, 'file_mtime': 108, 'sidecar_mtime': 108, 'policy': None}, 1]], [[{'embedded': 6, 'sidecar': ' 8', 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': 1, 'sidecar': ' 8', 'file_mtime': 105, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': ' 8', 'sidecar': '6', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': None}, 6], [{'embedded': 1, 'sidecar': '6', 'file_mtime': 100, 'sidecar_mtime': 99, 'policy': 'newest'}, 1], [{'embedded': 6, 'sidecar': 6, 'file_mtime': 100, 'sidecar_mtime': 105, 'policy': 'sidecar'}, 6], [{'embedded': 5, 'sidecar': 8, 'file_mtime': 109, 'sidecar_mtime': 114, 'policy': 'newest'}, 8], [{'embedded': None, 'sidecar': '6', 'file_mtime': 104, 'sidecar_mtime': 104, 'policy': 'latest'}, 6], [{'embedded': 8, 'sidecar': 3, 'file_mtime': 107, 'sidecar_mtime': 107, 'policy': None}, 3]], [[{'embedded': '6', 'sidecar': 8, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': 1, 'sidecar': 5, 'file_mtime': 107, 'sidecar_mtime': 108, 'policy': None}, 5], [{'embedded': 5, 'sidecar': '6', 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'latest'}, 6], [{'embedded': ' 8', 'sidecar': 8, 'file_mtime': 110, 'sidecar_mtime': 110, 'policy': 'embedded'}, 8], [{'embedded': 0, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': 'embedded'}, 1], [{'embedded': 0, 'sidecar': 9, 'file_mtime': 100, 'sidecar_mtime': 99, 'policy': 'latest'}, 1], [{'embedded': ' 8', 'sidecar': 0, 'file_mtime': 100, 'sidecar_mtime': 100, 'policy': None}, 8], [{'embedded': 6, 'sidecar': 8, 'file_mtime': 103, 'sidecar_mtime': 103, 'policy': 'latest'}, 8]]]\nlabels = [\"regression: equal modification times\", \"repair trap\", \"combined fault\", \"control\", \"control\", \"boundary\", \"boundary\", \"control\"]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"%s %d\" % (labels[i % len(labels)], i), 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":"5a8938a722d2384e11da5d62cd913d4f282ac8de285628b014b73a68a6015e01","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(d):\n    def ok(v):\n        if isinstance(v, str) and v.strip() in ('1', '2', '3', '4', '5', '6', '7', '8'):\n            return int(v.strip())\n        if isinstance(v, int) and not isinstance(v, bool) and 1 <= v <= 8:\n            return v\n        return None\n    e = ok(d.get('embedded'))\n    s = ok(d.get('sidecar'))\n    pol = d.get('policy')\n    if pol not in ('newest', 'sidecar', 'embedded'):\n        pol = 'newest'\n    if pol == 'sidecar':\n        order = [s, e]\n    elif pol == 'embedded':\n        order = [e, s]\n    elif s is not None and e is not None:\n        order = [s, e] if d['sidecar_mtime'] > d['file_mtime'] else [e, s]\n    else:\n        order = [s, e]\n    for v in order:\n        if v is not None:\n            return v\n    return 1\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[{'embedded': ' 8', 'sidecar': 5, 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'newest'}, 5], [{'embedded': 3, 'sidecar': ' 8', 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'latest'}, 8], [{'embedded': 5, 'sidecar': '+3', 'file_mtime': 103, 'sidecar_mtime': 108, 'policy': 'newest'}, 5], [{'embedded': 'x', 'sidecar': 'x', 'file_mtime': 109, 'sidecar_mtime': 109, 'policy': 'embedded'}, 1], [{'embedded': 8, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 101, 'policy': 'newest'}, 8], [{'embedded': 9, 'sidecar': 9, 'file_mtime': 108, 'sidecar_mtime': 109, 'policy': None}, 1], [{'embedded': '06', 'sidecar': None, 'file_mtime': 101, 'sidecar_mtime': 100, 'policy': 'embedded'}, 1], [{'embedded': '6', 'sidecar': 5, 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': None}, 5]], [[{'embedded': ' 8', 'sidecar': 5, 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': None}, 5], [{'embedded': 5, 'sidecar': ' 8', 'file_mtime': 104, 'sidecar_mtime': 105, 'policy': 'newest'}, 8], [{'embedded': 3, 'sidecar': None, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'embedded'}, 3], [{'embedded': 1, 'sidecar': '06', 'file_mtime': 104, 'sidecar_mtime': 105, 'policy': 'sidecar'}, 1], [{'embedded': ' 8', 'sidecar': 8, 'file_mtime': 107, 'sidecar_mtime': 112, 'policy': 'embedded'}, 8], [{'embedded': 3, 'sidecar': 6, 'file_mtime': 101, 'sidecar_mtime': 96, 'policy': 'sidecar'}, 6], [{'embedded': 3, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 103, 'policy': 'newest'}, 3], [{'embedded': 3, 'sidecar': 8, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'latest'}, 8]], [[{'embedded': ' 8', 'sidecar': 3, 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': None}, 3], [{'embedded': 8, 'sidecar': '6', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': None}, 6], [{'embedded': None, 'sidecar': '06', 'file_mtime': 110, 'sidecar_mtime': 115, 'policy': 'newest'}, 1], [{'embedded': 3, 'sidecar': '+3', 'file_mtime': 109, 'sidecar_mtime': 114, 'policy': None}, 3], [{'embedded': 'x', 'sidecar': ' 8', 'file_mtime': 101, 'sidecar_mtime': 101, 'policy': 'sidecar'}, 8], [{'embedded': 5, 'sidecar': 9, 'file_mtime': 105, 'sidecar_mtime': 110, 'policy': 'latest'}, 5], [{'embedded': ' 8', 'sidecar': '06', 'file_mtime': 100, 'sidecar_mtime': 101, 'policy': 'newest'}, 8], [{'embedded': 8, 'sidecar': 1, 'file_mtime': 108, 'sidecar_mtime': 108, 'policy': None}, 1]], [[{'embedded': 6, 'sidecar': ' 8', 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': 1, 'sidecar': ' 8', 'file_mtime': 105, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': ' 8', 'sidecar': '6', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': None}, 6], [{'embedded': 1, 'sidecar': '6', 'file_mtime': 100, 'sidecar_mtime': 99, 'policy': 'newest'}, 1], [{'embedded': 6, 'sidecar': 6, 'file_mtime': 100, 'sidecar_mtime': 105, 'policy': 'sidecar'}, 6], [{'embedded': 5, 'sidecar': 8, 'file_mtime': 109, 'sidecar_mtime': 114, 'policy': 'newest'}, 8], [{'embedded': None, 'sidecar': '6', 'file_mtime': 104, 'sidecar_mtime': 104, 'policy': 'latest'}, 6], [{'embedded': 8, 'sidecar': 3, 'file_mtime': 107, 'sidecar_mtime': 107, 'policy': None}, 3]], [[{'embedded': '6', 'sidecar': 8, 'file_mtime': 106, 'sidecar_mtime': 106, 'policy': 'newest'}, 8], [{'embedded': 1, 'sidecar': 5, 'file_mtime': 107, 'sidecar_mtime': 108, 'policy': None}, 5], [{'embedded': 5, 'sidecar': '6', 'file_mtime': 105, 'sidecar_mtime': 105, 'policy': 'latest'}, 6], [{'embedded': ' 8', 'sidecar': 8, 'file_mtime': 110, 'sidecar_mtime': 110, 'policy': 'embedded'}, 8], [{'embedded': 0, 'sidecar': 'x', 'file_mtime': 102, 'sidecar_mtime': 102, 'policy': 'embedded'}, 1], [{'embedded': 0, 'sidecar': 9, 'file_mtime': 100, 'sidecar_mtime': 99, 'policy': 'latest'}, 1], [{'embedded': ' 8', 'sidecar': 0, 'file_mtime': 100, 'sidecar_mtime': 100, 'policy': None}, 8], [{'embedded': 6, 'sidecar': 8, 'file_mtime': 103, 'sidecar_mtime': 103, 'policy': 'latest'}, 8]]]\nlabels = [\"regression: equal modification times\", \"repair trap\", \"combined fault\", \"control\", \"control\", \"boundary\", \"boundary\", \"control\"]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"%s %d\" % (labels[i % len(labels)], i), 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 with a stipulated contract; it makes no claim of conformance to any published specification. 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-image-orientation-metadata-sidecar-reconciliation-mtime-tie","generated_at":"2026-09-29T14:49:43.432503+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Camera, phone and scanner images carry an orientation hint separately from the stored pixels; galleries, thumbnailers, editors and upload pipelines must interpret it consistently or photos appear sideways, mirrored or doubly rotated.","root_cause":"Equal timestamps favour the embedded value instead of the sidecar.","sha256":"0edb3347725bf4f75144c82c41ed6030026d1b0b1e1af64ca62f9550817b4cd9","title":"Sidecar loses to the file when both were saved in the same second · 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":40.837,"exit_code":1,"observations":[{"actual":8,"check":"regression: equal modification times 0","expected":5,"passed":false},{"actual":3,"check":"repair trap 1","expected":8,"passed":false},{"actual":5,"check":"combined fault 2","expected":5,"passed":true},{"actual":1,"check":"control 3","expected":1,"passed":true},{"actual":8,"check":"control 4","expected":8,"passed":true},{"actual":1,"check":"boundary 5","expected":1,"passed":true},{"actual":1,"check":"boundary 6","expected":1,"passed":true},{"actual":6,"check":"control 7","expected":5,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: equal modification times 0\", \"actual\": 8, \"expected\": 5, \"passed\": false}, {\"check\": \"repair trap 1\", \"actual\": 3, \"expected\": 8, \"passed\": false}, {\"check\": \"combined fault 2\", \"actual\": 5, \"expected\": 5, \"passed\": true}, {\"check\": \"control 3\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"control 4\", \"actual\": 8, \"expected\": 8, \"passed\": true}, {\"check\": \"boundary 5\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 6\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"control 7\", \"actual\": 6, \"expected\": 5, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.294,"exit_code":1,"observations":[{"actual":8,"check":"regression: equal modification times 0","expected":5,"passed":false},{"actual":3,"check":"repair trap 1","expected":8,"passed":false},{"actual":5,"check":"combined fault 2","expected":5,"passed":true},{"actual":1,"check":"control 3","expected":1,"passed":true},{"actual":8,"check":"control 4","expected":8,"passed":true},{"actual":1,"check":"boundary 5","expected":1,"passed":true},{"actual":1,"check":"boundary 6","expected":1,"passed":true},{"actual":6,"check":"control 7","expected":5,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: equal modification times 0\", \"actual\": 8, \"expected\": 5, \"passed\": false}, {\"check\": \"repair trap 1\", \"actual\": 3, \"expected\": 8, \"passed\": false}, {\"check\": \"combined fault 2\", \"actual\": 5, \"expected\": 5, \"passed\": true}, {\"check\": \"control 3\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"control 4\", \"actual\": 8, \"expected\": 8, \"passed\": true}, {\"check\": \"boundary 5\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 6\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"control 7\", \"actual\": 6, \"expected\": 5, \"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."}}