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The memory leak is in _subprocess module in functions
getint and gethandle. They forget to decref the objects
returned by PyObject_GetAttrString(). The bug is
present in version 2.4 as well as in the trunk.
Few more bugs in the subprocess module that I found
while looking for the leak:
- class STARTUPINFO is missing a wShowWindow attribute
 (this is hidden because _subprocess.CreateProcess()
 ignores most of the exceptions)
- _execute_child() had a nonsensical test
 (if not None in tuple_of_posible_file_handles)
- _execute_child() is assigning attributes to a
 default_startupinfo, which isn't used if user
 supplies another one.