everest% cc -g malloc3.c
everest% 

everest% a.out
Everything is fine up to now, or is it?
Calling calloc()...
Bus error (core dumped)
everest% 

everest% dbx a.out
dbx version 6.2 Mar  9 1996 15:23:28
Core from signal SIGBUS: Bus error
(dbx) 

(dbx) where
>  0 __malloc(0x88, 0xd9d0000, 0x14, 0x0, 0x0, 0x0, 0x0, 0x0) ["/xlv23/patches/2086/work/irix/lib/libc/libc_64_M4/gen/malloc.c":284, 0xd9d10ac]
   1 _malloc(0x10012048, 0xd9d0000, 0x14, 0x0, 0x0, 0x10013090, 0x0, 0x0) ["/xlv23/patches/2086/work/irix/lib/libc/libc_64_M4/gen/malloc.c":186, 0xd9d0ea8]
   2 _calloc(0x0, 0xd9d0000, 0x14, 0x0, 0x0, 0x10013090, 0x0, 0x0) ["/xlv23/patches/2086/work/irix/lib/libc/libc_64_M4/gen/calloc.c":40, 0xd9c99b8]
   3 main() ["/home/faculty6/chang/course/cs202/ptr1/malloc3.c":37, 0x10000f4c]
   4 __start() ["/vince/6.2-mar09/work/irix/lib/libc/libc_64_M4/csu/crt1text.s":166, 0x10000e28]
(dbx) 

(dbx) list main
    12  main() {
    13     double *ptr1, *ptr2, *ptr3 ;
    14     int i ;
    15  
    16  
    17     /* Get memory for an array using malloc */
    18  
    19     ptr1 = (double *) malloc(TOP*sizeof(double)) ;
    20     if (ptr1 == NULL) {
    21        fprintf(stderr, "malloc() failed!\n") ;
(dbx) list
    22        exit(1) ;
    23     }
    24  
    25  
    26     /* Initialize array using array notation */
    27  
    28     for (i = 0 ; i <= TOP ; i++) { /* BIG MISTAKE */
    29        ptr1[i] = i*i ;
    30     }
    31  
(dbx) list
    32     printf("Everything is fine up to now, or is it?\n") ;
    33  
    34     /* Get memory for an array using calloc */
    35  
    36     printf("Calling calloc()...\n") ;
    37     ptr2 = (double *) calloc(TOP, sizeof(double)) ;
    38     printf("... return from calloc().\n") ;
    39  
    40     if (ptr2 == NULL) {
    41        fprintf(stderr, "calloc() failed!\n") ;
(dbx) 

(dbx) quit
everest%