NSZombieEnabled=YES

#define EXC_BAD_ACCESS          1       /* Could not access memory */
            /* Code contains kern_return_t describing error. */
            /* Subcode contains bad memory address. */

#define KERN_PROTECTION_FAILURE         2
            /* Specified memory is valid, but does not permit the
             * required forms of access.
             */

(lldb) image lookup -va 0xb0987654