IBM Support

OA22074: ABEND0C4 MODULE ISTTSC86 +836 WHEN PARTIAL BLOCKS OF DATA RECEIVED OVER SUBAREA MPC CONNECTION.

A fix is available

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • ABEND0C4 module ISTTSC86 +836 when partial blocks of data
    received over subarea MPC connection.
    *****
    Additional Symptoms:  You may also encounter the following INOP
     conditions after activating CP-CP across RTP pipe:
    
    IST1578I SOFT INOP DETECTED FOR QMS00ZL BY ISTTSCLC CODE = 201
    IST259I INOP RECEIVED FOR CMSNNCZL CODE = 01
    IST1222I READ DEVICE 084E IS INOPERATIVE, NAME IS QMS00ZL 955
    IST1578I DEVICE INOP DETECTED FOR QMS00ZL BY ISTTSC8X CODE = 001
    IST1578I SOFT INOP DETECTED FOR QMS00ZL BY ISTTSC8X CODE = 002
    *****
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All running subarea MPC connections.         *
    ****************************************************************
    * PROBLEM DESCRIPTION: ABEND0C4 ISTTSC86 when reassembling     *
    *                      split PIU received across multiple      *
    *                      READ channel programs.                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The problem is summarized as follows:
    1) A subarea MPC connection is active between two VTAMs.
    2) A burst of data across the WRITE channel program caused
       the last PIU to be split between two channel programs.
    3) When the second half of the PIU arrived on the READ side,
       an ABEND0C4 occurred in module ISTTSC86.  The ABEND
       was due to PTRTSCB being set to a negative value.
       The subsequent settting of TSCILNG resulted in the
       ABEND0C4.
    4) During aINOP processing a spin loop later occurred in
       module ISTTSC8X.  The loop occurred processing
       the MPNSORTQHD.
    
    Note: This problem only occurs in HVT6190 and higher releases.
    The problem is due to incorrect code being generated by a
    newer compiler version.
    

Problem conclusion

  • ISTTSC86 - Code in subroutine RECHAIN has been restructured to
    cause the compiler to generate accurate code.  Subroutine
    RECHAIN has also been changed to clear the MPNSORTQHD at the
    beginning in the event of an ABEND.  This will avoid any loops
    in subsequent INOP processing.
    
    Module ISTTSC8E has been included for maintenance purposes.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    OA22074

  • Reported component name

    VTAM V4 MVS/ESA

  • Reported component ID

    569511701

  • Reported release

    190

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2007-08-02

  • Closed date

    2007-08-16

  • Last modified date

    2010-04-06

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

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

    UA36413

Modules/Macros

  • ISTTSC8E ISTTSC86
    

Fix information

  • Fixed component name

    VTAM V4 MVS/ESA

  • Fixed component ID

    569511701

Applicable component levels

  • R190 PSY UA36413

       UP07/09/18 P F709

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"190","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSCY4DZ","label":"DO NOT USE"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"190","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
06 April 2010