gnumexp plot window crashes

[David Boucher]

I've upgraded gnome to the 2.22 version. And now, if I lauch gnumexp, open a plot window, ask for a new function, for example sin[x]. When I validate, I get a segfault.

I can reproduce it everytime.

I get this behaviour with numexp-core-0.16.2 and my last version in branches/david/

This happens with gnome-python-2.22 / pygtk-2.12.1 / python-2.5.1

Cheers.
David.

[David Boucher (bouda1)]

The crash seems to appear in plotarea.py, in the plot_object_added function when self.emit("plot-object-added", plot_object)

Hope that helps :-)

[David Boucher (bouda1)]

If I comment that line, I don't get any legend, but curves are drawn.

[Gustavo Carneiro (gjc)]

Showing me a traceback would help more... :-)

[David Boucher (bouda1)]

So you don't have this bug ?

I don't use python a lot ! So when I debug a little program, I abuse of "print"s, and arrive to the bug little by little. Now, for gnumexp, it's a little more difficult... :-)

And I don't know anything about tracebacks... :-S

[David Boucher (bouda1)]

After debugging a little more, I get something.

I've found that the segfault arrives in the pycairo package, exactly in cairo/pycairo-context.c file, in the function PycairoContext_FromContext.

This function is called with type = NULL and o = PycairoContext_Type.tp_alloc (type, 0) fails in that case.

After digging on google, I've found a work around, I replace :

   o = PycairoContext_Type.tp_alloc (type, 0);

by

    if (type == NULL)
 type = &PycairoContext_Type;
    o = PycairoContext_Type.tp_alloc (type, 0);

I don't know what I do here :-), if it is a good solution or not, but plotting sin(x) with gnumexp works again.

So, can we say that the bug is a pycairo bug ?

Sorry to insist, but I need a working version of gnumexp to test numexp. :-)

[David Boucher (bouda1)]

It's fixed now if we require pygoocanvas-0.10.0.