(gdb) run The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /usr/games/supertux (no debugging symbols found) Failed to read a valid object file image from memory. (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1216203072 (LWP 8755)] (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [/home/david/.supertux2] is in the search path [/usr/share/games/supertux] is in the search path (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [New Thread -1216328816 (LWP 8756)] Invalid button '0' in buttonmap Invalid button '1' in buttonmap (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) ---Type to continue, or q to quit--- (no debugging symbols found) [New Thread -1225090160 (LWP 8760)] supertux: xcb_xlib.c:50: xcb_xlib_unlock: Assertion `c->xlib.lock' failed. Program received signal SIGABRT, Aborted. [Switching to Thread -1216203072 (LWP 8755)] 0xffffe410 in ?? ()