Nandakumar Raghavan
056bc106e1
When a service is configured with Delegate=yes and DelegateSubgroup=sub, the delegated container may write domain controllers (e.g. "pids") into the service cgroup's cgroup.subtree_control via its cgroupns root. On container exit the stale controllers remain, and on service restart clone3() with CLONE_INTO_CGROUP fails with EBUSY because placing a process into a cgroup that has domain controllers in subtree_control violates the no-internal- processes rule. The same issue affects systemctl clean, where cg_attach() fails with EBUSY for the same reason. Add unit_cgroup_disable_all_controllers() helper in cgroup.c that clears stale controllers via cg_enable(mask=0) and updates cgroup_enabled_mask to keep internal tracking in sync. Call it from service_start() and service_clean() right before spawning, so that resource control is preserved for any lingering processes from the previous invocation as long as possible.
System and Service Manager
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