Program received signal SIGSEGV, Segmentation fault.
0x00002ad7c75f2b50 in strlen () from /lib/libc.so.6
(gdb) bt
#0  0x00002ad7c75f2b50 in strlen () from /lib/libc.so.6
#1  0x00002ad7c75c125a in vfprintf () from /lib/libc.so.6
#2  0x00002ad7c75c2143 in ?? () from /lib/libc.so.6
#3  0x00002ad7c75bda7e in vfprintf () from /lib/libc.so.6
#4  0x00002ad7c75c7278 in fprintf () from /lib/libc.so.6
#5  0x0000000000401490 in main ()
(gdb) quit