Breakpoint 1, 0xb6f6cc2e in gdk_x_error () from /usr/lib/libgdk-x11-2.0.so.0
(gdb) bt
#0  0xb6f6cc2e in gdk_x_error () from /usr/lib/libgdk-x11-2.0.so.0
#1  0xb7e4a330 in _XError () from /usr/lib/libX11.so.6
#2  0xb7e4732f in handle_error () from /usr/lib/libX11.so.6
#3  0xb7e473df in handle_response () from /usr/lib/libX11.so.6
#4  0xb7e48356 in _XReply () from /usr/lib/libX11.so.6
#5  0xb7e30135 in _XGetWindowAttributes () from /usr/lib/libX11.so.6
#6  0xb7e30269 in XGetWindowAttributes () from /usr/lib/libX11.so.6
#7  0xb7e71a6e in _XimDefaultColormap () from /usr/lib/libX11.so.6
#8  0xb7e72307 in _XimSetICDefaults () from /usr/lib/libX11.so.6
#9  0xb7e7236e in _XimSetICDefaults () from /usr/lib/libX11.so.6
#10 0xb7e6dba7 in _XimLocalCreateIC () from /usr/lib/libX11.so.6
#11 0xb7e540b4 in XCreateIC () from /usr/lib/libX11.so.6
#12 0x0806b639 in main (argc=2, argv=0xbfffe0e4) at xlib/main.c:946