Question

The following program crashes when I try to print the value of v. I’m trying to understand why. Any suggestions?

#include <stdio.h>

int main() {

    int v[5000000];
    printf("\n\nv = %p", v);
     return 0;
}

EDIT: the program does not segfault if instead of allocating 5000000 elements I allocate 500000 or less.

EDIT(2): increasing the stack size solved the problem. On Linux, I increase the stack size after reading the answer of stephane-rouberol (using ulimit -s <some_large_number>).

Answer 1

Congrats, you have stack overflow 🙂

Find a way to increase the size of the stack or just allocate the array dynamically:

int* v = malloc( 5000000 * sizeof *v);

/* do something */

free( v );