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PI61825: REGION HANGS AS THE QR TCB DOES NOT SEEM TO BE RUNNING AND CSA TIME HAS NOT BEEN UPDATED. 16/08/25 PTF PECHANGE

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APAR status

  • Closed as program error.

Error description

  • CICS region is hung. Review of the dump shows that the QR TCB
    is not running. The CSA time is behind the time of the dump.
    The QR TCB is hung because DB2 PAUSEd the TCB. However, CICS
    should not be making a DB2 call from the QR TCB.
    Looking at the trace further, I see the following:
    1. Task enters D2D2 to do a DB2_API_CALL on an L8 tcb and
    attempts to associate to an existing protected thread. While
    this call is in DB2, TMON purged the task. The task then gets
    dispatched on the QR TCb to do some recovery and issues an
    exception trace entry:
    AP 3259 D2D2 *EXC* - FAILED_TO_ASSOCIATE
    followed by the D2D2 recovery routine being driven. D2D2
    returns with a RESPONSE(EXCEPTION)
    REASO(ASSOCIATE_FAILED_FOR_PTHD).
    The very next trace entry shows this task going back into D2D2
    under the QR TCB. The retry logic was added by PI23186/PI27467
    but it is wrong to be retrying on the QR TCB!
    Additional Symptom(s) Search Keyword(s): KIXREVDWZ
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: CICS hangs whilst executing a DB2 task. *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A fix supplied by APAR PI27467 allowed DFHD2D2 to recover more
    efficiently when attempting to reuse a protected DB2 CSUB thread
    which had been previously purged. The fix ensured that DFHD2D2
    would return a response to DFHD2EX1 which resulted in DFHD2D2
    being redriven and attempting the associate again to a new
    thread rather than abending.
    In this case however, the CICS task was forcepurged whilst the
    TCB was still in DB2 and as a result the L8 TCB was destroyed,
    causing the redrive of DFHD2D2 to be executed under the QR TCB.
    

Problem conclusion

  • UI22670
    UI22671
    UI30325
    DFHD2D2 has been changed so that, if the redrive is issued
    whilst executing on the QR TCB we abend with a disaster
    response rather than attempt the re-associate.
    

Temporary fix

  •             *********
                * HIPER *
                *********
    FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PI61825

  • Reported component name

    CICS TS Z/OS V5

  • Reported component ID

    5655Y0400

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-05-03

  • Closed date

    2016-09-01

  • Last modified date

    2016-10-03

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

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

    PI64965 PI67418 UI40627 UI40628

Modules/Macros

  • DFHD2D2
    

Fix information

  • Fixed component name

    CICS TS Z/OS V5

  • Fixed component ID

    5655Y0400

Applicable component levels

  • R800 PSY UI40627

       UP16/09/17 P F609 ­

  • R900 PSY UI40628

       UP16/09/17 P F609 ­

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.

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Document Information

Modified date:
03 October 2016