From 4df2a2f85959954a599fbbd33011530986080d4c Mon Sep 17 00:00:00 2001
From: jsvisa <delweng@gmail.com>
Date: Thu, 23 Oct 2025 15:20:03 +0800
Subject: [PATCH] p2p: cleanup v4 if v5 failed

---
 p2p/server.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/p2p/server.go b/p2p/server.go
index 1f859089af..6a10f7f525 100644
--- a/p2p/server.go
+++ b/p2p/server.go
@@ -490,6 +490,11 @@ func (srv *Server) setupDiscovery() error {
 		}
 		srv.discv5, err = discover.ListenV5(sconn, srv.localnode, cfg)
 		if err != nil {
+			// Clean up v4 if v5 setup fails.
+			if srv.discv4 != nil {
+				srv.discv4.Close()
+				srv.discv4 = nil
+			}
 			return err
 		}
 	}