Created attachment 473976 [details]
File: backtrace

Thanks for a bug report. There doesn't seem to be anything related to evolution itself, the crashing thread is fully occupied by gtk2 functions, thus I'm moving it there.

Thread 1 (Thread 3234):
#0  pango_font_description_free (desc=0x22e) at fonts.c:820
#1  0x006f1346 in pango_attr_font_desc_destroy (attr=0xa8e5d40) at pango-attributes.c:664
#2  0x006f126d in pango_attr_list_unref (list=0xa8eddb0) at pango-attributes.c:1167
#3  0x006fb32c in pango_layout_finalize (object=0xa6245598 [PangoLayout]) at pango-layout.c:237
#4  0x0023713c in g_object_unref (_object=0xa6245598) at gobject.c:2695
#5  0x072e97f8 in get_size (cell=<value optimized out>, widget=0xa058008 [EMailSidebar], cell_area=0x0, layout=0xa6245598, x_offset=0x0, y_offset=0x0, width=0xbffc5e30, height=0xbffc5e34) at gtkcellrenderertext.c:1594
#6  0x072e0d59 in IA__gtk_cell_renderer_get_size (cell=0x9f43000 [GtkCellRendererText], widget=0xa058008 [EMailSidebar], cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0xbffc5e30, height=0xbffc5e34) at gtkcellrenderer.c:522
#7  0x074e3dc6 in IA__gtk_tree_view_column_cell_get_size (tree_column=0xa047a28 [GtkTreeViewColumn], cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0xbffc5f00, height=0xbffc5efc) at gtktreeviewcolumn.c:2645
#8  0x074c6e21 in validate_row (tree_view=0xa058008 [EMailSidebar], tree=0xa057930, node=0xa057b80, iter=0xbffc5fe8, path=0xa9edd28) at gtktreeview.c:5779
#9  0x074cb589 in validate_visible_area (tree_view=0xa058008 [EMailSidebar]) at gtktreeview.c:6100
#10 0x074cba15 in do_presize_handler (tree_view=0xa058008 [EMailSidebar]) at gtktreeview.c:6426
#11 0x074cbadc in presize_handler_callback (data=0xa058008) at gtktreeview.c:6448
#12 0x07714248 in gdk_threads_dispatch (data=0xa0e3230) at gdk.c:512
#13 0x002b6042 in g_idle_dispatch (source=0xa97c468, callback=0x77141e0 <gdk_threads_dispatch>, user_data=0xa0e3230) at gmain.c:4254
#14 0x002ba192 in g_main_dispatch (context=0x999f2a8) at gmain.c:2149
#15 g_main_context_dispatch (context=0x999f2a8) at gmain.c:2702
#16 0x002ba978 in g_main_context_iterate (context=0x999f2a8, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2780
#17 0x002bb04b in g_main_loop_run (loop=0x9d23c98) at gmain.c:2988
#18 0x073a2499 in IA__gtk_main () at gtkmain.c:1237
#19 0x0804a027 in main (argc=1, argv=0xbffc6394) at main.c:679

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