Strace hungs on clone(
...
mkdir("/sys/fs/cgroup/", 0755) = -1 EEXIST (File exists)
mkdir("/sys/fs/cgroup/cpu,cpuacct//", 0755) = -1 EEXIST (File exists)
mkdir("/sys/fs/cgroup/cpu,cpuacct//lxc/", 0755) = -1 EEXIST (File exists)
mkdir("/sys/fs/cgroup/cpu,cpuacct//lxc/116", 0755) = 0...