Why electric fence/Valgrind is unable to catch this buffer-overflow issue?

Question

I have created a buggy program - buggy.c - this is a buffer-overflow scenario for buffer t. You can see that I am writing more than 5 indexes. It works fine. It never throws me

Answer 1

Running valgrind --tool=exp-sgcheck ./buggy.out and it should be able to detect that you have buffer overrun within the local variable t[5]