Merge pull request #41584 from fanjiyun/fix-docker-stats-panic

docker stats: fix 'panic: close of closed channel'
moby · Oct 26, 2020 · a512c76 · a512c76
2 parents a9e867f + 3aa019e
commit a512c76
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/publisher.go b/publisher.go
@@ -66,8 +66,11 @@ func (p *Publisher) SubscribeTopicWithBuffer(topic topicFunc, buffer int) chan i
 // Evict removes the specified subscriber from receiving any more messages.
 func (p *Publisher) Evict(sub chan interface{}) {
 	p.m.Lock()
-	delete(p.subscribers, sub)
-	close(sub)
+	_, exists := p.subscribers[sub]
+	if exists {
+		delete(p.subscribers, sub)
+		close(sub)
+	}
 	p.m.Unlock()
 }