What is problem in this script ?

#!/usr/sbin/dtrace -s

#pragma D option quiet

fbt:ip:tcp_conn_request:entry
{
        self->connp = (conn_t *)arg0;
        self->tcp   = (tcp_t *)self->connp->conn_tcp;


@backlog[self->tcp->tcp_conn_req_cnt_q,self->tcp->tcp_conn_req_max]=count();

printf("\ntcp_conn_req_cnt_q: %d\n", self->tcp->tcp_conn_req_cnt_q);
printf("\ntcp_conn_req_max: %d\n", self->tcp->tcp_conn_req_max);
}


When i run appear error:

dtrace: error on enabled probe ID 1 (ID 38016:
fbt:ip:tcp_conn_request:entry): invalid address (0x0) in action #4 at
DIF offset 12

-- 
+++++++++++++++++++++++++++++++++++++++++++++++
Wesley Naves de Faria
Analista de Suporte
SCSA - Sun Certified System Administrator for Solaris 10
SCNA - Sun Certified Network Administrator for Solaris 10
FreeBSD / OpenBSD / Linux
+++++++++++++++++++++++++++++++++++++++++++++++
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