(gdb) bt full
#0  0x000000000049df50 in ?? ()
No symbol table info available.
#1  0x00000000005abbb2 in ?? ()
No symbol table info available.
#2  0x00000000005acd20 in ?? ()
No symbol table info available.
#3  0x0000000000442b42 in ?? ()
No symbol table info available.
#4  0x000000000043d64a in ?? ()
No symbol table info available.
#5  0x00000000004434c0 in ?? ()
No symbol table info available.
#6  0x00000000004475da in ?? ()
No symbol table info available.
#7  0x000000000045db33 in ?? ()
No symbol table info available.
#8  0x000000000045f943 in ?? ()
No symbol table info available.
#9  0x0000000000555b7b in ?? ()
No symbol table info available.
#10 0x000000000042d29e in ?? ()
No symbol table info available.
#11 0x000000000044c19a in ?? ()
No symbol table info available.
#12 0x00000000004efcf1 in ?? ()
No symbol table info available.
#13 0x00000000004f1478 in ?? ()
No symbol table info available.
#14 0x00000000004f31f0 in ?? ()
No symbol table info available.
#15 0x0000000000555a57 in ?? ()
No symbol table info available.
#16 0x00000000004e57ce in ?? ()
No symbol table info available.
#17 0x000000000055593b in ?? ()
No symbol table info available.
#18 0x00000000004e9df7 in ?? ()
No symbol table info available.
#19 0x00000000004ea110 in ?? ()
No symbol table info available.
#20 0x0000000000414e19 in ?? ()
No symbol table info available.
#21 0x00007ffff229b040 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#22 0x0000000000415908 in ?? ()
No symbol table info available.