[Cython] test crash in Py3.2 (NumPy/memoryview/refcounting related?)

mark florisson markflorisson88 at gmail.com
Sun Apr 22 13:54:44 CEST 2012

On 22 April 2012 11:57, Stefan Behnel <stefan_ml at behnel.de> wrote:
> Hi,
> I keep seeing test crashes in Py3.2 debug builds on Jenkins with the latest
> master, referring to ref-counting problems. Here, for example:
> https://sage.math.washington.edu:8091/hudson/job/cython-devel-tests/BACKEND=c,PYVERSION=py32-ext/328/console
> and likewise in the series of builds starting at #312.
> I'm not sure what changed in that corner, it looks like one of those
> problems that was there for a while and suddenly starts showing when you
> touch that innocent looking brick at the other end of the house that was
> holding the balance, until now. In this case, that brick was this commit:
> https://github.com/cython/cython/commit/c8f61a668d0ce8af1020f520253e1b5f623cf349
> I reverted it here and that fixed the problem at least temporarily:
> https://github.com/cython/cython/commit/5aac8caf1ba21933cc85a51af3319c78fc08d675
> but it seems to be back now (after my refnanny optimisations). Before
> reverting my changes, I was able to reproduce it somewhat reliably on
> sage.math by running these three tests together (non-forking):
>        memslice numpy_bufacc numpy_memoryview
> None of the tests shows the problem when run by itself. I can't tell if
> it's also in the latest py3k because I don't have a NumPy lying around that
> works there. So 3.2 is basically the latest Python version this can be
> tested with, and it doesn't occur in the 3.1 tests. The tests use NumPy
> 1.6.1, i.e. the latest official release.
> Mark, Dag, could any of you take a look to see if it appears in any way
> more obvious to you than to me?
> Stefan
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Hm, I think you can try to disable the numpy_memoryview test and just
continue development as normal. numpy_memoryview has a testcase
function which inserts the test into __test__, so you could just
comment out that line.

The test seems to fail before it runs though? Is it possible to obtain
a backtrace?

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