Error(s):

*** buffer overflow detected ***: /var/www/service/usercode/423453350/a.out terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f8abfd517e5]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f8abfdf256c]
/lib/x86_64-linux-gnu/libc.so.6(+0x116570)[0x7f8abfdf0570]
/lib/x86_64-linux-gnu/libc.so.6(__strcat_chk+0x2f)[0x7f8abfdef84f]
/var/www/service/usercode/423453350/a.out[0x400cf4]
/var/www/service/usercode/423453350/a.out[0x40147f]
/var/www/service/usercode/423453350/a.out[0x401544]
/var/www/service/usercode/423453350/a.out[0x400724]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f8abfcfa830]
/var/www/service/usercode/423453350/a.out[0x400779]
======= Memory map: ========
00400000-00402000 r-xp 00000000 b6:2bae1 3930323                         /var/www/service/usercode/423453350/a.out
00601000-00602000 r--p 00001000 b6:2bae1 3930323                         /var/www/service/usercode/423453350/a.out
00602000-00603000 rw-p 00002000 b6:2bae1 3930323                         /var/www/service/usercode/423453350/a.out
01fdb000-01ffd000 rw-p 00000000 00:00 0                                  [heap]
7f8abfac4000-7f8abfada000 r-xp 00000000 b6:2bae1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f8abfada000-7f8abfcd9000 ---p 00016000 b6:2bae1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f8abfcd9000-7f8abfcda000 rw-p 00015000 b6:2bae1 105                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f8abfcda000-7f8abfe99000 r-xp 00000000 b6:2bae1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f8abfe99000-7f8ac0099000 ---p 001bf000 b6:2bae1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f8ac0099000-7f8ac009d000 r--p 001bf000 b6:2bae1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f8ac009d000-7f8ac009f000 rw-p 001c3000 b6:2bae1 10849                   /lib/x86_64-linux-gnu/libc-2.23.so
7f8ac009f000-7f8ac00a3000 rw-p 00000000 00:00 0 
7f8ac00a3000-7f8ac00c9000 r-xp 00000000 b6:2bae1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f8ac0297000-7f8ac029a000 rw-p 00000000 00:00 0 
7f8ac02c5000-7f8ac02c8000 rw-p 00000000 00:00 0 
7f8ac02c8000-7f8ac02c9000 r--p 00025000 b6:2bae1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f8ac02c9000-7f8ac02ca000 rw-p 00026000 b6:2bae1 10838                   /lib/x86_64-linux-gnu/ld-2.23.so
7f8ac02ca000-7f8ac02cb000 rw-p 00000000 00:00 0 
7fffc2808000-7fffc281d000 rw-p 00000000 00:00 0                          [stack]
7fffc29bc000-7fffc29be000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

Abort signal from abort(3) (SIGABRT)