cgroup2: v1.0.0-rc.9 doesn't start up without adding +cpuset to /sys/fs/cgroup/cgroup.subtree_control

[AkihiroSuda]

# /tmp/runc run foo
WARN[0000] signal: killed                               
ERRO[0000] container_linux.go:346: starting container process caused "process_linux.go:297: applying cgroup configuration for process caused \"open /sys/fs/cgroup/foo/cpuset.cpus.effective: no such file or directory\"" 
container_linux.go:346: starting container process caused "process_linux.go:297: applying cgroup configuration for process caused \"open /sys/fs/cgroup/foo/cpuset.cpus.effective: no such file or directory\""

runc: 1.0.0-rc.9
OS: Fedora 31 beta (cgroup2 unified)

echo +cpuset > /sys/fs/cgroup/cgroup.subtree_control solves the issue