raise_application_error generates trace file

From: rob <robvl66_at_hotmail.com>
Date: 30 Nov 2001 06:23:28 -0800
Message-ID: <bde9a92.0111300623.5790f246@posting.google.com>

I've created a logon trigger to check if users ip adres is in out range. The strange thing is : it now and then generates a trace file. Could someone explain why.
Oracle8i Enterprise Edition Release 8.1.7.2.0 SunOS 5.8
I've edited the ip-range in the trigger for security reasons

Alert.log entry:
Errors in file /u01/app/oracle/admin/hlpdtest/udump/sid_ora_7112.trc:

ORA-00604: error occurred at recursive SQL level 1
ORA-20001: This service is for authorized personnel only
ORA-06512: at line 32

The trigger:
CREATE OR REPLACE TRIGGER on_logon
AFTER LOGON
ON DATABASE
DECLARE

   v_ip varchar2(15);
   v_usr varchar2(40);
   v_ses varchar2(40);
   v_host varchar2(40);
   v_date date;

BEGIN
   SELECT SYS_CONTEXT('USERENV','IP_ADDRESS')
, SYS_CONTEXT('USERENV','HOST')

   ,	  SYS_CONTEXT('USERENV','OS_USER')


   ,      SYS_CONTEXT('USERENV','SESSION_USER')

   ,      sysdate

   INTO v_ip


   ,    v_usr

   ,    v_ses

, v_host
, v_date

   FROM dual;

   IF v_ip NOT LIKE 'xxx.xxx.%'
   THEN

      INSERT
	  INTO intruders
	  VALUES (v_ip
	         ,v_usr
		 ,v_ses
		 ,v_host
	  	 ,v_date);
      COMMIT;
	  RAISE_APPLICATION_ERROR(-20001, 'This service is for authorized

personnel only');

   END IF;
END;
/ Received on Fri Nov 30 2001 - 08:23:28 CST