(gdb) backtrace
#0  0xb71cc42b in ?? () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
#1  0xb7fecd27 in call_init (l=<optimized out>, argc=argc@entry=1, argv=argv@entry=0xbffff1e4, 
    env=env@entry=0xbffff1ec) at dl-init.c:78
#2  0xb7fece14 in call_init (env=0xbffff1ec, argv=0xbffff1e4, argc=1, l=<optimized out>) at dl-init.c:36
#3  _dl_init (main_map=0xb7fff938, argc=1, argv=0xbffff1e4, env=0xbffff1ec) at dl-init.c:126
#4  0xb7fdf04f in _dl_start_user () from /lib/ld-linux.so.2