[Numpy-discussion] Bug in numpy user-define types mechanism causes segfault on multiple calls to a ufunc

[Tom Denniston]

Many thanks, Travis.  I'll test the new version tonight.

--Tom

On 2/7/07, Travis Oliphant <oliphant at ee.byu.edu> wrote:
> Tom Denniston wrote:
>
> >I am trying to register a custom type to numpy.  When I do so it works
> >and the ufuncs work but then when I invoke any ufunc twice the second
> >time my python interpretter segfaults.  I think i know what the
> >problem is.  In the select_types method in ufuncobject.c in
> >numpy/core/src/ numpy gets a reference to the key for the loop via a
> >
> >
> Thank you very much for your review of this less-used code.
>
> >If I comment out the obj DECREF it works.  I think one needs to either
> >do that or add an INCREF right after retrieving key.  I think either
> >will work but the multithreading implications are different.  I don't
> >think it matters give that (I believe) numpy doesn't release the GIL
> >but I thought someone on this list would be a better judge than I
> >(maybe Travis) of what the correct fix should be.
> >
> >Am I correct in my analysis?
> >
> >
>
> Your analysis seems spot on.  I think removing the  is the right course
> of action.   I've done it in SVN.
>
>
>
> -Travis
>
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