Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 66568)
+++ Modules/posixmodule.c	(working copy)
@@ -2378,9 +2378,10 @@
 				v = w;
 			}
 			else {
-				/* fall back to the original byte string, as
-				   discussed in patch #683592 */
-				PyErr_Clear();
+				Py_DECREF(v);
+				Py_DECREF(d);
+				d = NULL;
+				break;
 			}
 		}
 		if (PyList_Append(d, v) != 0) {