+ Reference.reachabilityFence(persister);
+ Reference.reachabilityFence(event_handler);
+ Reference.reachabilityFence(chain_monitor);
+ Reference.reachabilityFence(channel_manager);
+ Reference.reachabilityFence(net_graph_msg_handler);
+ Reference.reachabilityFence(peer_manager);
+ Reference.reachabilityFence(logger);