MERGE: Solved a potential deadlock in test_telnetlib.py. Related to issue #11812

Lib/test/test_telnetlib.py

@@ -21,7 +21,6 @@ def server(evt, serv):
         conn.close()
     finally:
         serv.close()
-        evt.set()
 
 class GeneralTests(TestCase):
 
@@ -33,11 +32,8 @@ class GeneralTests(TestCase):
         self.thread = threading.Thread(target=server, args=(self.evt,self.sock))
         self.thread.start()
         self.evt.wait()
-        self.evt.clear()
-        time.sleep(.1)
 
     def tearDown(self):
-        self.evt.wait()
         self.thread.join()
         del self.thread  # Clear out any dangling Thread objects.
 

Misc/NEWS

@@ -1616,6 +1616,8 @@ Tests
 - Skip network tests when getaddrinfo() returns EAI_AGAIN, meaning a temporary
   failure in name resolution.
 
+- Solved a potential deadlock in test_telnetlib.py. Related to issue #11812.
+
 - Avoid failing in test_robotparser when mueblesmoraleda.com is flaky and
   an overzealous DNS service (e.g. OpenDNS) redirects to a placeholder
   Web site.