Breakpoint 1, pango_core_text_fontset_get_key (fontset=0x0) at pangocoretext-fontmap.c:1591
1591	  return fontset->key;
(gdb) backtrace
#0  pango_core_text_fontset_get_key (fontset=0x0) at pangocoretext-fontmap.c:1591
#1  0x017de5ce in pango_core_text_font_map_load_fontset (fontmap=0x1a80a60, context=0xcec290, desc=0xcf53c0, language=0x130f77c)
    at pangocoretext-fontmap.c:1266
#2  0x024d6414 in pango_font_map_load_fontset (fontmap=0x1a80a60, context=0xcec290, desc=0xcf53c0, language=0x130f77c) at pango-fontmap.c:138
#3  0x024d2f98 in itemize_state_update_for_new_run (state=0xbfffad50) at pango-context.c:1352
#4  0x024d30b9 in itemize_state_process_run (state=0xbfffad50) at pango-context.c:1391
#5  0x024d35bd in pango_itemize_with_base_dir (context=0xcec290, base_dir=PANGO_DIRECTION_LTR, text=0x5431900 "Libraries", start_index=0, length=9, 
    attrs=0x1bff860, cached_iter=0x1bff880) at pango-context.c:1530
#6  0x024e220b in pango_layout_check_lines (layout=0xbd12d8) at pango-layout.c:3883
#7  0x024dfb7c in pango_layout_get_extents_internal (layout=0xbd12d8, ink_rect=0x0, logical_rect=0xbfffb488, line_extents=0x0) at pango-layout.c:2489
#8  0x024e0012 in pango_layout_get_extents (layout=0xbd12d8, ink_rect=0x0, logical_rect=0xbfffb488) at pango-layout.c:2671
#9  0x024e00e5 in pango_layout_get_pixel_extents (layout=0xbd12d8, ink_rect=0x0, logical_rect=0xbfffb488) at pango-layout.c:2697
#10 0x02ec0068 in get_size (cell=0x1aee028, widget=0x1ae8038, cell_area=0x0, layout=0xbd12d8, x_offset=0x0, y_offset=0x0, width=0xbfffb5d8, 
    height=0xbfffb5dc) at gtkcellrenderertext.c:1542
#11 0x02ec0352 in gtk_cell_renderer_text_get_size (cell=0x1aee028, widget=0x1ae8038, cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0xbfffb5d8, 
    height=0xbfffb5dc) at gtkcellrenderertext.c:1607
#12 0x02eb4902 in gtk_cell_renderer_get_size (cell=0x1aee028, widget=0x1ae8038, cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0xbfffb5d8, 
    height=0xbfffb5dc) at gtkcellrenderer.c:522
#13 0x031367fd in gtk_tree_view_column_cell_get_size (tree_column=0xb71550, cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0xbfffb688, height=0xbfffb684)
    at gtktreeviewcolumn.c:2646
#14 0x03118094 in validate_row (tree_view=0x1ae8038, tree=0x5457b90, node=0xbd1e20, iter=0xbfffb820, path=0x51de3c0) at gtktreeview.c:5781
#15 0x031190eb in validate_visible_area (tree_view=0x1ae8038) at gtktreeview.c:6102
#16 0x03113a09 in gtk_tree_view_bin_expose (widget=0x1ae8038, event=0xbfffc508) at gtktreeview.c:4377
#17 0x0311650d in gtk_tree_view_expose (widget=0x1ae8038, event=0xbfffc508) at gtktreeview.c:5077
#18 0x0520eee6 in gtksharp_widget_base_expose_event (widget=0x1ae8038, evnt=0xbfffc508) at generated.c:5200
#19 0x07f05598 in ?? ()
#20 0x07f0554c in ?? ()
#21 0x07f05308 in ?? ()
#22 0x07f0505a in ?? ()
#23 0x052357c4 in ?? ()
#24 0x02fa534e in _gtk_marshal_BOOLEAN__BOXED (closure=0x51a240, return_value=0xbfffc040, n_param_values=2, param_values=0xbfffc0f0, 
    invocation_hint=0xbfffc070, marshal_data=0x5235790) at gtkmarshalers.c:86
#25 0x02706cfe in g_type_class_meta_marshal ()
#26 0x027064ed in g_closure_invoke ()
#27 0x02726e28 in signal_emit_unlocked_R ()
#28 0x02725f01 in g_signal_emit_valist ()
#29 0x02726501 in g_signal_emit ()
#30 0x03151159 in gtk_widget_event_internal (widget=0x1ae8038, event=0xbfffc508) at gtkwidget.c:4984
#31 0x03150d81 in gtk_widget_send_expose (widget=0x1ae8038, event=0xbfffc508) at gtkwidget.c:4813
#32 0x02fa14d8 in gtk_main_do_event (event=0xbfffc508) at gtkmain.c:1609
#33 0x023bc692 in _gdk_window_process_updates_recurse (window=0x1b45000, expose_region=0xcf5200) at gdkwindow.c:5429