multi: add debug logs to catch slow shutdown

htlcswitch/hop/iterator.go

@@ -139,7 +139,8 @@ func (p *OnionProcessor) Start() error {
 // Stop shutsdown the onion processor's sphinx router.
 func (p *OnionProcessor) Stop() error {
 
-	log.Info("Onion processor shutting down")
+	log.Info("Onion processor shutting down...")
+	defer log.Debug("Onion processor shutdown complete")
 
 	p.router.Stop()
 	return nil