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Thread 1 (Thread 2394):
#0  0x00007f7b4fc476b9 in free () from /lib/libc.so.6
No symbol table info available.
#1  0x00000000004037b6 in ?? ()
No symbol table info available.
#2  0x00007f7b5081e5ae in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#3  0x00007f7b50833983 in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#4  0x00007f7b50834d39 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#5  0x00007f7b50835283 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#6  0x00007f7b5251a510 in ?? () from /usr/lib/libxfce4panel.so.1
No symbol table info available.
#7  0x00007f7b51dee728 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#8  0x00007f7b5081e5ae in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#9  0x00007f7b50833983 in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#10 0x00007f7b50834bcc in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#11 0x00007f7b50835283 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#12 0x00007f7b51ef572f in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#13 0x00007f7b51de7e7a in gtk_main_do_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#14 0x00007f7b5184bcdc in ?? () from /usr/lib/libgdk-x11-2.0.so.0
No symbol table info available.
#15 0x00007f7b5017dbbe in g_main_context_dispatch ()
   from /lib/libglib-2.0.so.0
No symbol table info available.
#16 0x00007f7b50181588 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#17 0x00007f7b501819e5 in g_main_loop_run () from /lib/libglib-2.0.so.0
No symbol table info available.
#18 0x00007f7b51de8177 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#19 0x000000000040274b in main ()
No symbol table info available.