1
2#include <stdlib.h>
3
4void ddd ( char* x )
5{
6  free(x);
7  free(x);
8}
9
10void ccc (char* x)
11{
12  ddd(x);
13}
14
15void bbb (char* x)
16{
17  ccc(x);
18}
19
20void aaa (char* x)
21{
22  bbb(x);
23}
24
25int main ( void )
26{
27   char* x = malloc(10);
28   aaa(x);
29   return 0;
30}
31