fedora 25 coredump not being generated

[jayshankar nair]

Hi,
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