From 2fbc391319310fd22450ab863eeab3df91ee0030 Mon Sep 17 00:00:00 2001
From: Julien Duponchelle <julien@duponchelle.info>
Date: Fri, 16 Oct 2015 20:42:13 +0200
Subject: [PATCH] Force canceling all task when shutdown server

https://bugs.python.org/issue24080

Fix #705
---
 gns3server/server.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gns3server/server.py b/gns3server/server.py
index cc0e1f53..ba6d7650 100644
--- a/gns3server/server.py
+++ b/gns3server/server.py
@@ -99,6 +99,9 @@ class Server:
         if self._port_manager.udp_ports:
             log.warning("UDP ports are still used {}".format(self._port_manager.udp_ports))
 
+        for task in asyncio.Task.all_tasks():
+            task.cancel()
+
         self._loop.stop()
 
     def _signal_handling(self):