From c2dd4fa9a303ad871cb32dec44110733832f4b19 Mon Sep 17 00:00:00 2001
From: xfy <i@rua.plus>
Date: Wed, 3 Jun 2026 01:07:54 +0800
Subject: [PATCH] fix(resolver): prevent double-close panic in
 DNSResolver.Stop()

Use atomic Swap instead of Load+close+Store to eliminate the race
window where concurrent Stop() calls could both pass the check.
---
 internal/resolver/resolver.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/internal/resolver/resolver.go b/internal/resolver/resolver.go
index 4918235..e150b90 100644
--- a/internal/resolver/resolver.go
+++ b/internal/resolver/resolver.go
@@ -406,12 +406,11 @@ func (r *DNSResolver) doRefresh() {
 
 // Stop 停止解析器。
 func (r *DNSResolver) Stop() error {
-	if !r.started.Load() {
+	if !r.started.Swap(false) {
 		return nil
 	}
 
 	close(r.stopCh)
-	r.started.Store(false)
 	return nil
 }