.
Thread 1 (process 4002):
#0  0x00007fa4e52757f3 in select () from /lib/libc.so.6
#1  0x00007fa4e44fa19e in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fa4e44fbc8c in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#3  0x00007fa4e4029fac in _XReply () from /usr/lib/libX11.so.6
#4  0x00007fa4e401de13 in XSync () from /usr/lib/libX11.so.6
#5  0x00007fa4e778a42e in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#6  0x00007fa4e778a544 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#7  0x00007fa4e776c169 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#8  0x00007fa4e776cc70 in gdk_window_process_all_updates ()
   from /usr/lib/libgdk-x11-2.0.so.0
#9  0x00007fa4e776cc99 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#10 0x00007fa4e77500fb in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#11 0x00007fa4e574640b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#12 0x00007fa4e5749bcd in ?? () from /usr/lib/libglib-2.0.so.0
#13 0x00007fa4e5749d8b in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#14 0x00007fa4e7b2add1 in gtk_main_iteration ()
   from /usr/lib/libgtk-x11-2.0.so.0
#15 0x00007fa4e867e705 in ?? () from /usr/lib/libgksu2.so.0
#16 0x00007fa4e867fa30 in gksu_sudo_full () from /usr/lib/libgksu2.so.0
#17 0x00000000004044c4 in ?? ()
#18 0x00007fa4e51b55a6 in __libc_start_main () from /lib/libc.so.6
#19 0x0000000000403019 in ?? ()
#20 0x00007ffff0aa5458 in ?? ()
#21 0x000000000000001c in ?? ()
#22 0x0000000000000002 in ?? ()
#23 0x00007ffff0aa6be7 in ?? ()
#24 0x00007ffff0aa6bec in ?? ()
#25 0x0000000000000000 in ?? ()