Index: Lib/logging/config.py
===================================================================
--- Lib/logging/config.py	(revision 85007)
+++ Lib/logging/config.py	(working copy)
@@ -895,8 +895,10 @@
     Stop the listening server which was created with a call to listen().
     """
     global _listener
-    if _listener:
-        logging._acquireLock()
-        _listener.abort = 1
-        _listener = None
+    logging._acquireLock()
+    try:
+        if _listener:
+            _listener.abort = 1
+            _listener = None
+    finally:
         logging._releaseLock()