Error en la secuencia de comandos dtrace que imprime el proceso cmdline + nombre del padre.

Me gustaría tener un script dtrace que para cada nuevo proceso, imprima su línea de comandos + su nombre del proceso principal. Aquí está mi guión:

#!/usr/sbin/dtrace -s

proc:::exec
{
    self->pexecname = execname;
}

proc:::exec-success
/ self->pexecname != 0 /
{
    this->isx64=(curproc->p_flag & P_LP64)!=0;
    #define SELECT_64_86(x64, x86) (this->isx64 ? (x64) : (x86))
    #define GET_POINTER(base, offset) (user_addr_t)SELECT_64_86(*(uint64_t *)((base)+sizeof(uint64_t)*(offset)), *(uint32_t *)((base)+sizeof(uint32_t)*(offset)))


    this->ptrsize=SELECT_64_86(sizeof(uint64_t),sizeof(uint32_t));
    this->argc=curproc->p_argc;


    this->isClean=SELECT_64_86(1, (curproc->p_dtrace_argv==(uregs[R_SP]+sizeof(uint32_t)+sizeof(uint32_t))));
    this->argv=(uint64_t)copyin(curproc->p_dtrace_argv,this->ptrsize*this->argc);
    /* printf("%s with args:%d (%p, %p)\n",execname, this->argc, curproc->pdtraceargv, uregs\[R_SP\]); */



    printf("parent is %s process is -->  ", execname);
    printf("%s ", (0 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,0)) : "");
    printf("%s ", (1 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,1)) : "");
    printf("%s ", (2 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,2)) : "");
    printf("%s ", (3 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,3)) : "");
    printf("%s ", (4 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,4)) : "");
    printf("%s ", (5 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,5)) : "");
    printf("%s ", (6 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,6)) : "");
    printf("%s ", (7 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,7)) : "");
    printf("%s ", (8 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,8)) : "");
    printf("%s ", (9 < this->argc && this->isClean) ? copyinstr(GET_POINTER(this->argv,9)) : "");

    printf("\n");
    #undef GET_POINTER
    #undef SELECT_64_86
}

Sin embargo, mientras se ejecuta el script, parece que para algunas sondas hay variables sin inicializar / corruptas.

Este es un ejemplo de salida del siguiente comando de bash sudo dtrace -C -s ./procargs.d . Se puede ver que la sonda proc:mach_kernel:__mac_execve:exec-success tiene un valor sin inicializar en curproc->p_dtrace_argv :

dtrace: script '/Users/zkabeli/procargs3.d' matched 4 probes
CPU     ID                    FUNCTION:NAME
 4   1212         posix_spawn:exec-success parent is Calendar process is --> /Applications/Calendar.app/Contents/MacOS/Calendar          

 6   1208        __mac_execve:exec-success parent is SFLIconTool process is -->  /System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framework/Versions/A/Support/SFLIconTool com.apple.recentitems RecentApplications        

dtrace: error on enabled probe ID 4 (ID 1208: proc:mach_kernel:__mac_execve:exec-success): invalid address (0x7fff59e82e08) in action #5 at DIF offset 320
 2   1212         posix_spawn:exec-success parent is kcm process is -->  /System/Library/PrivateFrameworks/Heimdal.framework/Helpers/kcm --launchd         

¿Quizás puedas decirme qué hay de malo con mi script?