From b157ce1e58b03988ce4340a55d0b856125833cc5 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 13 Sep 2017 06:43:58 -0700
Subject: [PATCH] bpo-31234: Fix dangling thread in test_ftplib (#3544)

Clear also self.server_thread attribute in TestTimeouts.tearDown().
---
 Lib/test/test_ftplib.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Lib/test/test_ftplib.py b/Lib/test/test_ftplib.py
index 372282b4faf..5880a1e941d 100644
--- a/Lib/test/test_ftplib.py
+++ b/Lib/test/test_ftplib.py
@@ -988,6 +988,8 @@ class TestTimeouts(TestCase):
     def tearDown(self):
         ftplib.FTP.port = self.old_port
         self.server_thread.join()
+        # Explicitly clear the attribute to prevent dangling thread
+        self.server_thread = None
 
     def server(self):
         # This method sets the evt 3 times: