Bug#505832: python-gtk2: segfault with invalid $DISPLAY

[Timo Juhani Lindfors]

Package: python-gtk2
Version: 2.12.1-6
Severity: normal

Steps to reproduce:
1) cat > prog.py <<EOF
import gobject
import pygtk
import gtk

loop = gobject.MainLoop()
w = gtk.Window(gtk.WINDOW_TOPLEVEL)
w.set_default_size(480, 300)
w.show()

vbox = gtk.VBox(False, 0)
w.add(vbox)
vbox.show()
loop.run()
EOF
2) DISPLAY=:99 python prog.py

Expected results:
2) python-gtk complains about not being able to connect to DISPLAY :99

Actual results:
2) python-gtk prints a lot of warnings and then segfaults:

/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.py:72: GtkWarning: could not open display
  warnings.warn(str(e), _gtk.Warning)
kapula:7: Warning: invalid (NULL) pointer instance
  w = gtk.Window(gtk.WINDOW_TOPLEVEL)
kapula:7: Warning: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
  w = gtk.Window(gtk.WINDOW_TOPLEVEL)
kapula:9: GtkWarning: Screen for GtkWindow not set; you must always set
a screen for a GtkWindow before using the window
  w.show()
kapula:9: GtkWarning: gdk_screen_get_default_colormap: assertion `GDK_IS_SCREEN (screen)' failed
  w.show()
kapula:9: GtkWarning: gdk_colormap_get_visual: assertion `GDK_IS_COLORMAP (colormap)' failed
  w.show()
kapula:9: GtkWarning: gdk_screen_get_root_window: assertion `GDK_IS_SCREEN (screen)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_new: assertion `GDK_IS_WINDOW (parent)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_enable_synchronized_configure: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_user_data: assertion `window != NULL' failed
  w.show()
kapula:9: GtkWarning: gtk_style_attach: assertion `window != NULL' failed
  w.show()
kapula:9: GtkWarning: gtk_style_set_background: assertion `GTK_IS_STYLE (style)' failed
  w.show()
kapula:9: GtkWarning: gtk_paint_flat_box: assertion `GTK_IS_STYLE (style)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_accept_focus: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_focus_on_map: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_modal_hint: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gtk_window_realize_icon: assertion `widget->window != NULL' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_geometry_hints: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_unmaximize: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_unstick: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_deiconify: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_unfullscreen: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_keep_above: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_set_keep_below: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:9: GtkWarning: gdk_window_show: assertion `GDK_IS_WINDOW (window)' failed
  w.show()
kapula:12: Warning: g_object_ref: assertion `G_IS_OBJECT (object)' failed
  w.add(vbox)
kapula:12: GtkWarning: gtk_style_attach: assertion `window != NULL' failed
  w.add(vbox)
kapula:13: GtkWarning: _gtk_style_peek_property_value: assertion `GTK_IS_STYLE (style)' failed
  vbox.show()
Segmentation fault (core dumped)

More info:
1) gdb shows

(gdb) bt
#0  0xb785e4e7 in gtk_widget_style_get_valist () from /usr/lib/libgtk-x11-2.0.so.0
#1  0xb785e726 in gtk_widget_style_get () from /usr/lib/libgtk-x11-2.0.so.0
#2  0xb785e7bf in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#3  0x082dcc18 in ?? ()
#4  0xb795a03f in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#5  0xbf8348c8 in ?? ()
#6  0x00000000 in ?? ()
(gdb) x/5i $eip
0xb785e4e7 <gtk_widget_style_get_valist+247>:   mov    (%eax),%eax
0xb785e4e9 <gtk_widget_style_get_valist+249>:   mov    %eax,(%esp)
0xb785e4ec <gtk_widget_style_get_valist+252>:   call   0xb762ca80 <g_type_value_table_peek at plt>
0xb785e4f1 <gtk_widget_style_get_valist+257>:   mov    -0x60(%ebp),%edi
0xb785e4f4 <gtk_widget_style_get_valist+260>:   mov    $0x10,%ecx
(gdb) p $eax
$1 = 0




-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.18-6-686-bigmem (SMP w/1 CPU core)
Locale: LANG=C, LC_CTYPE=fi_FI (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-gtk2 depends on:
ii  libatk1.0-0                   1.22.0-1   The ATK accessibility toolkit
ii  libc6                         2.7-15     GNU C Library: Shared libraries
ii  libcairo2                     1.6.4-6.1  The Cairo 2D vector graphics libra
ii  libglib2.0-0                  2.16.6-1   The GLib library of C routines
ii  libgtk2.0-0                   2.12.11-4  The GTK+ graphical user interface 
ii  libpango1.0-0                 1.20.5-3   Layout and rendering of internatio
ii  python                        2.5.2-3    An interactive high-level object-o
ii  python-cairo [python2.5-cairo 1.4.12-1.1 Python bindings for the Cairo vect
ii  python-gobject [python2.5-gob 2.14.2-1   Python bindings for the GObject li
ii  python-numeric [python2.5-num 24.2-9     Numerical (matrix-oriented) Mathem
ii  python-support                0.8.7      automated rebuilding support for P
pn  python2.4-cairo               <none>     (no description available)
pn  python2.4-gobject             <none>     (no description available)
pn  python2.4-numeric             <none>     (no description available)
ii  python2.5                     2.5.2-11.1 An interactive high-level object-o

python-gtk2 recommends no packages.

Versions of packages python-gtk2 suggests:
pn  python-gtk2-doc               <none>     (no description available)

-- no debconf information