STINNER Victor added the comment:

Serhiy: "small_stack increases C stack consumption even for calls without 
keyword arguments. This is serious problem since we can't control stack 
overflow."

This problem is not new and is worked around by Py_EnterRecursiveCall() macro 
which counts the depth of the Python stack.

I didn't notice any stack overflow crash with my patch. We can reduce the 
"small_stack" size later if needed.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28839>
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