main.c

#include <stdio.h>

char buf[32] = "Hello World";
char *bufptr = buf;

void f(char **x) {
  printf("%s\n", *x);
}

int main() {
  f(&bufptr);  // OK; OK
  f(&buf);     // Warning; Segmentation Fault
  return 0;
}

main.c: In function ‘main’:
main.c:12:3: warning: passing argument 1 of ‘f’ from incompatible pointer type [enabled by default]
   f(&buf);     // Warning; Segmentation Fault
   ^
main.c:6:6: note: expected ‘char **’ but argument is of type ‘char (*)[32]’
 void f(char **x) {
      ^
ramntry@roman-tereshin-GS60:~/tmp/carray$ ./a.out 
Hello World
Segmentation fault (core dumped)