#0  0x00007ffff7866148 in vfprintf () from /lib/libc.so.6
No symbol table info available.
#1  0x00007ffff7870507 in fprintf () from /lib/libc.so.6
No symbol table info available.
#2  0x0000000000402cfb in move_obstacle (win_game=0x62f970, ob=0x63cf60)
    at game.c:391
No locals.
#3  0x0000000000402359 in loop_obstacles (win_game=0x62f970,
    ob_listitem=0x63cea0) at game.c:204
        ob_cur = 0x63cf60
#4  0x000000000040252b in loop_game (pl=0x62da40, windowlist=0x62f930,
    timer=0x63ce80, ob_listitem=0x63cea0) at game.c:247
        elapsed = 19
#5  0x0000000000403067 in main () at main.c:60
        pl = 0x62da40
        windowlist = 0x62f930
        timer = 0x63ce80
        ob_listitem = 0x63cea0