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// This was useful for troubleshooting invalid pointer addresses from userspace.
dtrace -qn '::scsi_uscsi_handle_cmd:entry /args[2]->uscsi_bufaddr != 0 && args[2]->uscsi_bufaddr < (caddr_t)0xfffffff/
    {
      self->p1 = (unsigned long)args[2]->uscsi_bufaddr;
      self->p2 = args[2]->uscsi_cdb[0];
      self->flags = args[2]->uscsi_flags;
      self->cdbl = args[2]->uscsi_cdblen;
      self->bufl = args[2]->uscsi_buflen;
      self->to = args[2]->uscsi_timeout;
    }
    ::scsi_uscsi_handle_cmd:return /self->p1 || self->p2/ {
      printf("Prog: %s *buf: %p cdb[0]: %p cdblen: %d buflen: %d flags: %d time: %d\n", 
              execname, self->p1, self->p2, 
              self->cdbl, self->bufl, self->flags, self->to);
      self->p1 = 0; self->p2 = 0;
      self->cdbl = 0; self->to = 0;
      self->bufl = 0; self->flags = 0;
    }'

dtrace -qn '::scsi_uscsi_handle_cmd:entry /args[2]->uscsi_bufaddr != 0 && args[2]->uscsi_bufaddr < (caddr_t)0xfffffff/
{
  this->u = (union scsi_cdb *)args[2]->uscsi_cdb;
  print((*this->u).cdb_un);
}'

// Dump out CDBs from uscsi_cmd structs.
dtrace -qn '::scsi_uscsi_handle_cmd:entry
  /execname == "sg_raw" && args[2]->uscsi_cdblen == 0x6/ 
  {
  this->x = args[2]->uscsi_cdb; 
  printf("cdb[6]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
  this->x[0], this->x[1], this->x[2], this->x[3], this->x[4], this->x[5]);
  }
  ::scsi_uscsi_handle_cmd:entry
  /execname == "sg_raw" && args[2]->uscsi_cdblen == 0xa/ 
  {
  this->x = args[2]->uscsi_cdb; 
  printf("cdb[10]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", 
  this->x[0], this->x[1], this->x[2], this->x[3], this->x[4], 
  this->x[5], this->x[6], this->x[7], this->x[8], this->x[9]);
  }'