Issue #9947: logging: Fixed locking bug in stopListening.
diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index cc75e94..60744a0 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -917,8 +917,10 @@
     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()