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GTK segfault with GTK3 and mpl_toolkits#1813

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mdboom merged 2 commits intomatplotlib:masterfrom
mdboom:gtk3-version-check
May 28, 2013
Merged

GTK segfault with GTK3 and mpl_toolkits#1813
mdboom merged 2 commits intomatplotlib:masterfrom
mdboom:gtk3-version-check

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@mdboom mdboom commented May 20, 2013

Something goes wrong when using a GTK3 backend and the mpl_toolkits. See this very minimal testcase:

>>> from gi.repository import Gtk
>>> import mpl_toolkits.axisartist
/usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed
  import gobject._gobject
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: specified class size for type `PyGtkGenericCellRenderer' is smaller than the parent type's `GtkCellRenderer' class size
  from gtk import _gtk
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: g_type_get_qdata: assertion `node != NULL' failed
  from gtk import _gtk
Segmentatiefout (geheugendump gemaakt)

Most likely, something imports the old GTK2 bindings, run following for the same error:

>>> from gi.repository import Gtk
>>> import gtk

Grepping the sourcecode gives mpl_toolkits/gtktools.py where it is used, but I can't even find where it is imported.

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mdboom commented May 20, 2013

This looks as if you do not have the development files for Gtk3 installed. Would you mind testing the attached patch? It should give you an error message to this effect.

efiring
efiring reviewed May 25, 2013
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Comment thread lib/matplotlib/backends/backend_gtk3.py Outdated
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@efiring efiring May 25, 2013

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Missing word: "requires".
Also, this has me puzzled, because I can run the gtk3agg backend on ubuntu Precise, but I don't have the libgtk-3-dev package installed.

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@mdboom mdboom May 28, 2013

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It seems things are packaged somewhat differently on Debian/Ubuntu than on Fedora. I think on Ubuntu, the required package is: gir1.2-gtk3.0 https://launchpad.net/ubuntu/precise/+package/gir1.2-gtk-3.0

Since we don't really know what distro the user will be using, I'm inclined to change this to:

"The Gtk3 backend requires that the GObject introspection bindings for Gtk 3 are installed."

That should give a user enough to Google something by.

mdboom added a commit that referenced this pull request May 28, 2013
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Merge pull request #1813 from mdboom/gtk3-version-check
dd38945 
GTK segfault with GTK3 and mpl_toolkits
@mdboom mdboom merged commit dd38945 into matplotlib:master May 28, 2013
mdboom added a commit that referenced this pull request May 28, 2013
@mdboom
Merge pull request #1813 from mdboom/gtk3-version-check
130b6fc 
GTK segfault with GTK3 and mpl_toolkits
@mdboom mdboom deleted the gtk3-version-check branch August 7, 2014 13:54
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