[root@fruid-dev ~]# vi main.c
[root@fruid-dev ~]# gcc main.c
[root@fruid-dev ~]# ./a.out
Segmentation fault (core dumped)
[root@fruid-dev ~]# cat main.c
int main(){
    char *p="ABCD";
    *p='J';
}
[root@fruid-dev ~]# valgrind ./a.out
==7844== Memcheck, a memory error detector
==7844== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==7844== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==7844== Command: ./a.out
==7844==
==7844==
==7844== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==7844==  Bad permissions for mapped region at address 0x4005A0
==7844==    at 0x4004FD: main (in /root/a.out)
==7844==
==7844== HEAP SUMMARY:
==7844==     in use at exit: 0 bytes in 0 blocks
==7844==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==7844==
==7844== All heap blocks were freed -- no leaks are possible
==7844==
==7844== For counts of detected and suppressed errors, rerun with: -v
==7844== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)
[root@fruid-dev ~]#