StacktraceTop: ?? () ?? () ?? () ?? () __libc_start_main (main=0x4020b0, argc=1, ubp_av=0x7fff2705fd48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff2705fd38) at libc-start.c:260
StacktraceTop: 0x7fff2705fd48, init=<optimized out>, fini=<optimized out>, rtld_fini= <optimized out>, stack_end= 0x7fff2705fd38) at libc-start.c:260
?? ()
?? ()
?? ()
?? ()
__libc_start_main (main=0x4020b0, argc=1, ubp_av=