Re: [Matplotlib-users] Segmentation fault from inside transforms

[John H. <jdh...@ac...>]

>>>>> "Ted" == Ted Drain <ted...@jp...> writes:

    Ted> I'm trying to build matplotlib and I'm getting a segmentation
    Ted> fault when I do: from matplotlib import *

    Ted> I've traced the fault down to the transforms module.

    Ted> My first attempt used: gcc 3.3.2 Python 2.3.3 numarray 1.1
    Ted> gdmodule 0.52 gd 2.0.28 freetype 2.1.9 agg 22 matplotlib
    Ted> 0.63.4

Standard issue stuff - very close to what most people are using w/o
incident.  Hmmmm....

    Ted> In this version _na_transform segementation faults at this
    Ted> line: static _transforms_module* _transforms = new
    Ted> _transforms_module;

    Ted> I traced the fault down to the ExtensionModuleBaseClass where
    Ted> it attempts to call: __Py_PackageContext()

    Ted> It looks to me like this function is trying to access the
    Ted> variable (which it dereferences WITHOUT checking for a null
    Ted> pointer).  static char **ptr__Py_PackageContext = NULL;

Could you try editing it an adding the NULL test; if this works can
you submit a patch pack to be and a bug report to the pycxx sf site?

    Ted> This ptr gets init'ed in the function
    Ted> InitialisePythonIndirectInterface() but I can't find anywhere
    Ted> that function is being called.

    Ted> FYI: I also tried matplotlib 0.62.4 and I get the same error.

It couldn't be the exact same error, because _na_transforms did not
exist in 0.62.4.  Do you mean that you got a segfault on the same line
in _transform?

Thanks,
JDH