sock_map_unref
sock_map_unref(elem->sk, elem);
sock_map_unref(elem->sk, elem);
sock_map_unref(sk, psk);
sock_map_unref(sk, psk);
sock_map_unref(osk, &stab->sks[idx]);
sock_map_unref(elem->sk, elem);
sock_map_unref(elem->sk, elem);