(gdb) bt
#0  0x2ab55ff8 in xcb_send_request () from /usr/lib/libxcb.so.1
#1  0x2ab61fb0 in xcb_get_geometry_unchecked () from /usr/lib/libxcb.so.1
#2  0x2b2ef2d0 in ecore_x_drawable_geometry_get_prefetch (drawable=<value optimized out>) at ecore_xcb_drawable.c:28
#3  0x00666f60 in cb_lcb_new() ()
#4  0x0065566c in ZLEwlOptionsDialog(FBReader&) ()
#5  0x005efab8 in ZLApplication::doActionByKey(std::string const&) ()
#6  0x0063aeac in ?? ()