Restructures the guest cgroup layout so each exec gets its OWN child cgroup
(/container/<id>/<execID>) with memory.oom.group=1, a fair cpu.weight, and a
pids.max backstop — so one control session can't OOM-kill, starve, or fork-bomb
its siblings in the shared container. The container init moves to its own leaf
so the container cgroup can delegate controllers to children (cgroup v2
no-internal-process rule). New Cgroup2Manager helpers: setOomGroup/setCpuWeight/
setPidsMax/remove.
Best-effort with graceful fallback: any failure in the per-exec setup wipes the
partial state and reverts to today's flat layout, and each exec falls back to the
container cgroup — a cgroup hiccup degrades to current behavior, never a failed
start.
COMPILE-VERIFIED via the musl cross-build; NOT yet runtime-validated. Built as
image tag -nucleic2; vminitReference stays on the validated -nucleic1 until
-nucleic2 is checked in a real container. A hard host-configured per-exec
memory.max (exec-RPC resources field) remains a follow-up.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
abkslmandClaude Opus 4.8
2eb563c90c