[SciPy-Dev] Weird segfault in call to PyArray_SIZE

[Ralf Gommers]

On Mon, Jun 26, 2017 at 9:08 AM, Jaime Fernández del Río <
jaime.frio at gmail.com> wrote:

> While working in scipy.ndimage I tried to replace the following code, see
> here
> <https://github.com/scipy/scipy/blob/master/scipy/ndimage/src/ni_support.c#L95> for
> the source:
>
> npy_intp max_lines;
> int ii;
>
> for (ii = 0; ii < array->nd; ii++)
>     max_lines *= array->dimensions[ii];
>
> with the in theory equivalent:
>
> max_lines = PyArray_SIZE(array);
>
> Oddly enough, the result is a segfault as soon as PyArray_SIZE is called,
> e.g. by running the ndimage tests.
>
> Both numpy and scipy are the latest development versions, built by myself
> on OSX. Unfortunately I don't have Python and friends built with debug
> symbols, so the best I have been able to figure out, through printf
> debugging, is that the segfault happens before PyArray_MultiplyList is
> entered, which made me suspicious of it being related to import_array()
> not being called, but that doesn't seem to be the case.
>

Even if it's not the cause here, that ``#undef NO_IMPORT_ARRAY`` looks
quite odd, it's the only place in scipy or numpy where that is done. May be
good to get rid of it.

Ralf


> Any thoughts on what may be causing this?
>
> Jaime
>
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