--- Lib/multiprocessing/util.py.orig	2013-03-27 07:45:19.000000000 +0000
+++ Lib/multiprocessing/util.py	2013-03-27 07:44:24.000000000 +0000
@@ -134,6 +134,7 @@
             func(obj)
         except Exception as e:
             info('after forker raised exception %s', e)
+    _afterfork_registry.clear()
 
 def register_after_fork(obj, func):
     _afterfork_registry[(next(_afterfork_counter), id(obj), func)] = obj