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

[Ted D. <ted...@jp...>]

Well I have somewhat good news.  I was using an older machine (RedHat7) 
when I had these problems.  I went to a much newer redhat machine and 
everything works fine.  Same version of Python, gcc, etc - just a newer 
operating system.

I guess I'll just ignore this problem and stick with the newer machine.

Ted

At 01:47 PM 10/21/2004, Todd Miller wrote:
>On Thu, 2004-10-21 at 16:00, John Hunter wrote:
> > >>>>> "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?
>
>Check for matplotlib/_transforms.so left over from prior installations
>and blow away your old matplotlib and re-install if you find it.  Before
>you re-install, also blow away matplotlib/build.
>
>Todd