I have written a snippet of code to generate core dump.

a.c

#include <stdio.h>

main()

{

char **c;

c=10;

}

gcc a.c -o a -g

Run:./a

In fedora 25 after segmentation fault, core dump  file is not being created. 

I have also set the core file to unlimit with the command ulimit -c unlimited.

Thanks,

Jayshankar

Thanks,

Jayshankar