systemd does not start as PID!=1: missing cgroup setup

[flonatel]

When using release1, systemd stops with:

Cannot determine cgroup we are running in: No such file or directory
Failed to allocate manager object: No such file or directory

The analyze revealed, that when booting with sysv-init (only), the directory /sys/fs/cgroups is empty, when booting with systemd it contains the some cgroups.

systemd assumes, that the cgroup setup is done when it is not started as pid 1:

systemd/src/core/main.c:

    if (getpid() == 1) {
            install_crash_handler();

            r = mount_cgroup_controllers(arg_join_controllers); /* <<<<<<< Init of cgroup */
            if (r < 0)
                    goto finish;
    }

But: pipexec (and also sysv-init) does obviously not know anything about cgroups.