GDB backtrace, with commit 029012f4c39d9d3d9ae617491a69f76f54a4192f applied. [htd@chiara ~]$ gdb Thunar GNU gdb (GDB) Fedora 7.10-29.fc23 Copyright (C) 2015 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from Thunar...Reading symbols from /usr/lib/debug/usr/bin/thunar.debug...done. done. (gdb) run Starting program: /usr/bin/Thunar [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffe4951700 (LWP 31066)] [New Thread 0x7fffdffff700 (LWP 31067)] [New Thread 0x7fffdf06e700 (LWP 31068)] [New Thread 0x7fffdd136700 (LWP 31079)] [Thread 0x7fffdd136700 (LWP 31079) exited] [New Thread 0x7fffdd136700 (LWP 31082)] [New Thread 0x7fffdc935700 (LWP 31083)] (Thunar:31062): GLib-GObject-WARNING **: invalid uninstantiatable type '' in cast to 'GObject' (Thunar:31062): GLib-GObject-CRITICAL **: g_object_set_qdata: assertion 'G_IS_OBJECT (object)' failed Program received signal SIGSEGV, Segmentation fault. g_type_check_instance_is_fundamentally_a (type_instance=type_instance@entry=0x7fffd001d750, fundamental_type=fundamental_type@entry=80) at gtype.c:4032 4032 node = lookup_type_node_I (type_instance->g_class->g_type); Missing separate debuginfos, use: dnf debuginfo-install bzip2-libs-1.0.6-17.fc23.x86_64 libgcc-5.1.1-4.fc23.x86_64 libstdc++-5.1.1-4.fc23.x86_64 (gdb) backtrace #0 0x00007ffff4def07d in g_type_check_instance_is_fundamentally_a (type_instance=type_instance@entry=0x7fffd001d750, fundamental_type=fundamental_type@entry=80) at gtype.c:4032 #1 0x00007ffff4dcf447 in g_object_unref (_object=0x7fffd001d750) at gobject.c:3076 #2 0x000055555558e4c2 in thunar_file_info_clear (file=file@entry=0x7fffd0056e10) at thunar-file.c:896 #3 0x000055555558fa7d in thunar_file_load (file=file@entry=0x7fffd0056e10, error=error@entry=0x0, cancellable=0x0) at thunar-file.c:1170 #4 0x000055555558fb33 in thunar_file_reload (file=0x7fffd0056e10) at thunar-file.c:3928 #5 0x00007ffff4acbe3a in g_main_context_dispatch (context=0x555555860070) at gmain.c:3154 #6 0x00007ffff4acbe3a in g_main_context_dispatch (context=context@entry=0x555555860070) at gmain.c:3769 #7 0x00007ffff4acc1d0 in g_main_context_iterate (context=0x555555860070, block=block@entry=1, dispatch=dispatch@entry=1, self=) at gmain.c:3840 #8 0x00007ffff4acc4f2 in g_main_loop_run (loop=0x555555b3eff0) at gmain.c:4034 #9 0x00007ffff69f0f37 in IA__gtk_main () at gtkmain.c:1268 #10 0x0000555555577765 in main (argc=1, argv=0x7fffffffdfc8) at main.c:312 (gdb)