bus error/segfault from PyArg_ParseTuple in initproc with incorrect arg number

[Andrew MacIntyre]

Miles Lubin wrote:
> I am using PyArg_ParseTuple to parse the arguments (ignoring the keyword 
> arguments) to my initproc for a type I define.
> It seems that something goes wrong inside PyArg_ParseTuple when it gets 
> the wrong number of arguments (my format string is "OO");
> if the function isn't given exactly two arguments, I get a bus error on 
> OS X and a segfault on Linux.
> If two arguments are given, the code runs as expected.
> This does not occur when using PyArg_ParseTuple in a normal method.
> Am I not using PyArg_ParseTuple correctly?
> 
> Here's the relevant code:
> PyObject *a, *b;
> if (!PyArg_ParseTuple(args, "OO", &a, &b))
> 	return -1;
> 
> The segfault occurs on this line, not on any line after.

I have seen bus errors on FreeBSD when python runs out of stack space.

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