OA31253: ABEND0C4 IN ISTACCP3+X'ADC' AND WRONG DIALNO VALUES USED DURING DIAL-OUT PROCESSING

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A SIMLOGON is issued to set up a session between an application
  and a terminal LU over a switched connection, causing
  initiation of dial-out processing. The switched major node
  defining the switched connection contains more than 255 path
  statements, each with a unique DIALNO value.  When VTAM attempts
  to retrieve the DIALNO value for this switched connection, an
  ABEND0C4 results in VTAM module ISTACCP3.
  

Local fix

• Reconfigure the switched major node to have less
  than 256 path statements.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using switched major nodes.              *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 in module ISTACCP3 at offset   *
  *                      x'ADC'                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem may be summarized as follows:
  
  1. A large switched major node containing 500 path statements
     was activated.  Example statements from the major node
     follow below (truncated):
  
  SWN1     VBUILD TYPE=SWNET,MAXGRP=5,MAXNO=2500
  *
  TPU0001  PU    ADDR=01,IDBLK=017,IDNUM=F0001,
                 ANS=CONTINUE,DISCNT=NO,MAXOUT=1,MAXDATA=265,
                 SPAN=BASIC,PUTYPE=2,MODETAB=MODETAB1,PACING=0,
                 PASSLIM=1,MAXPATH=1,
                 VPACING=0,DLOGMOD=IBM3600
  *
                 PATH GRPNM=A122,GID=1,PID=1,DIALNO=000990CFF002
  *
  TRM00001 LU    LOCADDR=1,SPAN=BASIC
  TRM00002 LU    LOCADDR=2,SPAN=BASIC
  
  2. A local host application issued a SIMLOGON macroinstruction
     to establish a session with one of the terminal LUs defined
     in the switched major node.  The path statement for the
     selected LU was the 256th path statement defined in the
     major node.
  
  3. The index for the associated PAT control block was equal
     to decimal 256 (x'100').  Module ISTACCP3 passed this index
     to the GETDLNO macroinstruction to retrieve the DIALNO.
     This macro requires an index that does not exceed a value
     of 255 (x'FF').  The passed index was truncated to a value
     of x'00' and resulted in the calculation of an incorrect
     address for the PAT control block.  An abend0c4 resulted.
  

Problem conclusion

• To resolve this problem, the following changes have been
  made:
  
  1. The GETDLNO macro is used to obtain the DIALNO from the
     DLACB control block.  GETDLNO has been modified to
     correctly accommodate an input index value exceeding
     decimal 255.
  
  2. The following modules have been recompiled with the
     change to the GETDLNO macro:
  
     ISTACCP3  ISTACCQH  ISTACCQI ISTACCQK  ISTACCSH  ISTNOCEE
     ISTNOCPA
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UA51928 UA51929 UA51930

Modules/Macros

• GETDLNO  ISTACCP3 ISTACCQH ISTACCQI ISTACCQK
  ISTACCSH ISTNOCEE ISTNOCPA
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1A0 PSY UA51928

     UP10/03/17 P F003

• R1B0 PSY UA51929

     UP10/03/17 P F003

• R190 PSY UA51930

     UP10/03/17 P F003

Fix is available

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