遇到一个panic

[suqinglee]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xdc2d1f]

goroutine 1475 [running]:
github.com/polarismesh/polaris/apiserver/nacosserver/v2/discover.(*DiscoverServer).HandleClientDisConnect(0xc0017a50a0, {0x195c6d8?, 0xc000b400a0}, 0x0)
        ~/polaris/apiserver/nacosserver/v2/discover/instance.go:245 +0x3f
github.com/polarismesh/polaris/apiserver/nacosserver/v2/discover.(*ConnectionClientManager).OnEvent(0xc0017a6600, {0x195c6d8, 0xc000b400a0}, {0x13ed9c0?, 0xc002b3a300})
        ~/polaris/apiserver/nacosserver/v2/discover/client_conn.go:94 +0x38b
github.com/polarismesh/polaris/common/eventhub.(*subscription).receive(0xc0017a6680, {0x195c6d8, 0xc000b400a0})
        ~/polaris/common/eventhub/subscription.go:116 +0x1f3
created by github.com/polarismesh/polaris/common/eventhub.(*topic).subscribe in goroutine 1469
        ~/polaris/common/eventhub/topic.go:77 +0x2c5

分支是1.8.0，对应到代码这里：

这里的client是nil

[chuntaojun]

nacos sdk 和场景可以描述下吗

[andrewshan]

收到，我们这边看看

[rayowang]

@suqinglee hello，我这边使用V2跑了流程暂时没有复现上面问题。问下这个具体是怎么使用的，sdk是什么语言什么版本？

[suqinglee]

客户端版本我也不太清楚，等再复现我捞一下日志看看客户端是啥版本吧

[chuntaojun]

func (h *ConnectionManager) UnRegisterConnection(connID string) {
	h.lock.Lock()
	defer h.lock.Unlock()
	client, ok := h.clients[connID]
	if ok {
		_ = eventhub.Publish(ClientConnectionEvent, &ConnectionEvent{
			EventType: EventClientDisConnected,
			ConnID:    connID,
			Client:    client,
		})

		delete(h.clients, connID)
		delete(h.connections, client.Addr.String())

		tcpConn, ok := h.tcpConns[client.Addr.String()]
		if ok {
			_ = tcpConn.Close()
		}
	}
}

应该是有一些连接没有触发到 func (h *ConnectionManager) TagConn(ctx context.Context, connInfo *stats.ConnTagInfo) context.Context {
这个方法的调用就 UnRegister 了，上面是建议的修复逻辑