From dee7411f05468b4092264ff460180b7e77ece363 Mon Sep 17 00:00:00 2001
From: jokemanfire <hu.dingyang@zte.com.cn>
Date: Wed, 12 Nov 2025 09:39:08 +0800
Subject: [PATCH] fix(libnetwork): nil pointer will cause panic

make panic info more useful

Signed-off-by: jokemanfire <hu.dingyang@zte.com.cn>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
---
 daemon/libnetwork/ns/init_linux.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/daemon/libnetwork/ns/init_linux.go b/daemon/libnetwork/ns/init_linux.go
index 2ecb616b59..a59812ec07 100644
--- a/daemon/libnetwork/ns/init_linux.go
+++ b/daemon/libnetwork/ns/init_linux.go
@@ -2,6 +2,7 @@ package ns
 
 import (
 	"context"
+	"fmt"
 	"sync"
 	"syscall"
 	"testing"
@@ -30,7 +31,8 @@ func initHandles() {
 	}
 	initNl, err = nlwrap.NewHandle(getSupportedNlFamilies()...)
 	if err != nil {
-		log.G(context.TODO()).Errorf("could not create netlink handle on initial namespace: %v", err)
+		// Fail fast to keep the invariant: NlHandle must be a valid handle
+		panic(fmt.Errorf("could not create netlink handle on initial (host) namespace: %w", err))
 	}
 	err = initNl.SetSocketTimeout(NetlinkSocketsTimeout)
 	if err != nil {