STINNER Victor added the comment:

It looks like calloc-3.patch is wrong: it modify _PyObject_GC_Malloc() to fill 
the newly allocated buffer with zeros, but _PyObject_GC_Malloc() is not only 
called by PyType_GenericAlloc(): it is also used by _PyObject_GC_New() and 
_PyObject_GC_NewVar(). The patch is maybe a little bit slower because it writes 
zeros twice.

calloc.patch adds "PyObject* _PyObject_GC_Calloc(size_t);" and doesn't have 
this issue.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21233>
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