Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1219684160 (LWP 6347)]
0xb7b5aae3 in xfce_rc_set_group () from 
/usr/local/lib/libxfce4util.so.4
(gdb) bt
#0  0xb7b5aae3 in xfce_rc_set_group () from 
/usr/local/lib/libxfce4util.so.4
#1  0xb5e8c03d in apply_show_config ()
   from /usr/lib/xfce4/mcs-plugins/backdrop_settings.so
#2  0xb5e8d33e in behavior_page_create ()
   from /usr/lib/xfce4/mcs-plugins/backdrop_settings.so
#3  0xb5e88810 in ?? () from 
/usr/lib/xfce4/mcs-plugins/backdrop_settings.so
#4  0x08068558 in ?? ()
#5  0xb5e8dff2 in ?? () from 
/usr/lib/xfce4/mcs-plugins/backdrop_settings.so
#6  0xb5e85550 in ?? () from 
/usr/lib/xfce4/mcs-plugins/backdrop_settings.so
#7  0x080cedc0 in ?? ()
#8  0x00000000 in ?? ()