I installed some libgail symbols and waited for segfault again, got some line numbers:
#0 0x00007fffe91a3836 in gail_text_util_text_setup (textutil=0x2c8, text=0x555556a49c30 "#fsf-office") at ./modules/other/gail/libgail-util/gailtextutil.c:134 __inst = 0x2c8 __t = 93825015311472 __r = <optimized out> __func__ = "gail_text_util_text_setup" #1 0x00007fffe93c8b28 in gail_item_notify_label_gtk (obj=<optimized out>, pspec=<optimized out>, data=0x7fffbc0906c0) at ./modules/other/gail/gailitem.c:329 label_text = <optimized out> atk_obj = 0x7fffbc0906c0 label = <optimized out> gail_item = 0x7fffbc0906c0 data = 0x7fffbc0906c0 obj = <optimized out> atk_obj = 0x7fffbc0906c0 #2 0x00007ffff57fdf75 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #3 0x00007ffff580ff82 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #4 0x00007ffff5818bdc in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #5 0x00007ffff5818fbf in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #6 0x00007ffff58023a4 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #7 0x00007ffff5801c46 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #8 0x00007ffff5804a0b in g_object_thaw_notify () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 No symbol table info available. #9 0x00005555555bccb3 in ?? () No symbol table info available. #10 0x00007ffff522c8f0 in purple_signal_emit_vargs () from /usr/lib/libpurple.so.0 No symbol table info available. #11 0x00007ffff522ca4e in purple_signal_emit () from /usr/lib/libpurple.so.0 No symbol table info available. #12 0x00005555555b518b in ?? () No symbol table info available. #13 0x00007ffff67d07bc in _gtk_marshal_BOOLEAN__BOXED (closure=0x5555568ef760, return_value=0x7fffffffbf40, n_param_values=<optimized out>, param_values=0x7fffffffbfa0, invocation_hint=<optimized out>, marshal_data=<optimized out>) at ./gtk/gtkmarshalers.c:86 callback = 0x5555555b5170