common/interrupt: close connections outside group lock

common/interrupt/group.go

@@ -47,15 +47,19 @@ func (g *Group) NewSingPacketConn(conn N.PacketConn, isExternal bool, isProvider
 
 func (g *Group) Interrupt(interruptExternalConnections bool) {
 	g.access.Lock()
-	defer g.access.Unlock()
 	var toDelete []*list.Element[*groupConnItem]
+	var toClose []io.Closer
 	for element := g.connections.Front(); element != nil; element = element.Next() {
 		if !element.Value.isExternal || interruptExternalConnections {
-			element.Value.conn.Close()
 			toDelete = append(toDelete, element)
+			toClose = append(toClose, element.Value.conn)
 		}
 	}
 	for _, element := range toDelete {
 		g.connections.Remove(element)
 	}
+	g.access.Unlock()
+	for _, conn := range toClose {
+		_ = conn.Close()
+	}
 }