add current failures for windows/py3

known_failures.py

@@ -68,6 +68,22 @@ FLAKY test__greenletset.py
         #   error: [Errno 10049] [Error 10049] The requested address is not valid in its context.
         FAILING_TESTS.append('test_ftplib.py')
 
+    if PY3:
+        # XXX need investigating
+        FAILING_TESTS += '''
+            test__example_portforwarder.py
+            test__socket_ex.py
+            test__examples.py
+            test_hub_join_timeout.py
+            test_subprocess.py
+            test__issue600.py
+            test__subprocess.py
+            test_threading_2.py
+            test__api_timeout.py
+            test__subprocess_poll.py
+            test__example_udp_client.py
+        '''.split('\n')
+
 
 if LEAKTEST:
     FAILING_TESTS += [