Index: Objects/exceptions.c
===================================================================
--- Objects/exceptions.c	(revision 46603)
+++ Objects/exceptions.c	(working copy)
@@ -851,7 +851,6 @@
             PyTuple_SET_ITEM(tuple, 1, Py_None);
         }
 
-        Py_INCREF(repr);
         PyTuple_SET_ITEM(tuple, 2, repr);
 
         rtnval = PyString_Format(fmt, tuple);