Hallo Leute

Ich habe ein Programm, wleches ich mittels DTrace-Scipts analysiere.

Code:
#!/usr/sbin/dtrace -s

sched:::off-cpu
/curlwpsinfo->pr_state == SSLEEP && execname == "checkqueue"/
{
   /***
    * We're sleeping. Trach our sobj type.
    ***/
   self->sobj = curlwpsinfo->pr_stype;
   self->bedtime = timestamp;
}

sched:::off-cpu
/curlwpsinfo->pr_state == SRUN && execname == "checkqueue"/
{
   self->bedtime = timestamp;
}

sched:::on-cpu
/self->bedtime && !self->sobj && execname == "checkqueue"/
{
   @["preempted"] = quantize(timestamp - self->bedtime);
   self->bedtime = 0;
}

sched:::on-cpu
/self->sobj && execname == "checkqueue"/
{
   @[self->sobj == SOBJ_MUTEX ? "kernel-level lock" :
      self->sobj == SOBJ_RWLOCK ? "rwlock" :
      self->sobj == SOBJ_CV ? "condition variable" :
      self->sobj == SOBJ_SEMA ? "semaphore" :
      self->sobj == SOBJ_USER ? "user-level lock" :
      self->sobj == SOBJ_USER_PI ? "user-level prio-inheriting lock" :
      self->sobj == SOBJ_SHUTTLE ? "shuttle" : "unknown"] =
      quantize(timestamp - self->bedtime);

   self->sobj = 0;
   self->bedtime = 0;
}
Wenn ich das Script starte, bekomme ich folgende Fehlermeldung

Code:
 ./whyProcSleep.d 
dtrace: script './whyProcSleep.d' matched 6 probes
dtrace: error on enabled probe ID 1 (ID 470: sched:unix:resume:off-cpu): invalid address (0x0) in action #1 at DIF offset 56
^C

  kernel-level lock                                 
           value  ------------- Distribution ------------- count    
           16384 |                                         0        
           32768 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@            5        
           65536 |@@@@@@@@@@@                              2        
          131072 |                                         0        

  condition variable                                
           value  ------------- Distribution ------------- count    
           16384 |                                         0        
           32768 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@      166      
           65536 |@                                        6        
          131072 |                                         0        
          262144 |                                         1        
          524288 |                                         0        
         1048576 |                                         1        
         2097152 |                                         0        
         4194304 |@@@                                      14       
         8388608 |                                         0        

  preempted                                         
           value  ------------- Distribution ------------- count    
            8192 |                                         0        
           16384 |@@@@@@@@@@@@@@@@@@@@@@@@@@@              11538    
           32768 |@@@@@@@@@@@@@                            5379     
           65536 |                                         6        
          131072 |                                         1        
          262144 |                                         0
Das Script scheint jedoch zu laufen, da es mir eine Zusammenfassung generiert.

Was jemand, was ich an der Probe 1 falsch gemacht habe?

Danke für die Hilfe
f0rtex