STINNER Victor added the comment:

Oh, I didn't understand that the regression was introduced by the revision 
b9c9691c72c5. The purpose of this revision was to *reduce* the memory usage of 
the C stack!?

It seems like _PyObject_CallArg1() uses more stack memory than 
PyObject_CallFunctionObjArgs(). PyObject_CallFunctionObjArgs() allocates 4O 
bytes (5*sizeof(PyObject*)) on the stack.

At least, I can say that when the crash occurs, _PyObject_FastCallDict() is not 
the gdb backtrace.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28858>
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