/* valgrind ./a.out 0 ~> no error */

/* valgrind ./a.out 1 ~> error */

#include <stdlib.h>

struct something {

    char c;

    int x;

};

/* === 8 bytes ===

 * 42

 * garbage

 * garbage

 * garbage

 * 42

 * 42

 * 42

 * 42

 */

int main(int argc, char *argv[])

{

    struct something st = { 0x2A, 0x2A2A2A2A };

    struct something st_copy = st;

    return (int) *(&(st_copy.c)+atoi(argv[1]));

}

/* error generated after main returns */