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PK77945: CICS ENCOUNTERS TIMEOUTS ATNI, AZCT, DEADLOCK TIMEOUT AFCY, AFCI AND SLOW-DOWNS DUE TO AIDS BUILDUP

A fix is available

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APAR status

  • Closed as program error.

Error description

  • TCTTE AIDS build-up on the local TCTSE.  This results in a high
    cpu time and slow-downs. The TCTSE had more than 400,000 AIDS
    queued. Slow-down occurs whenever DFHALP runs the aid chain.
    Additional Symptom(s) Search Keyword(s):
    KIXREVDAM ABENDAZCT
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION: Build up of AID control blocks for      *
    *                      transient data trigger tasks.           *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A trigger transaction was scheduled to run against a terminal.
    The associated TD queue was non-recoverable. Another task issued
    the EXEC CICS READQ commands against the triggered task's queue
    however. When the queue was read to qzero, CICS set TDTIBM off
    and cleared TDDCTAAD, after having cancelled the AID by setting
    AIDSTTSK on. The trigger task then reached syncpoint, and was
    suspended before driving commit processing. While it was
    suspended, another task issued a WRITEQ to the queue and caused
    a new trigger event. TDTIBM was set on again, and TDDCTAAD set
    to address the new AID. When the original trigger task was
    resumed, it reached TDRM commit. This has code to schedule a new
    AID for the task if it has not read to qzero. Since the state of
    the queue implied this, DFHTDRM called DFHALP to schedule a new
    AID. This was addressed from TDDCTAAD in the queue's DCT, and
    meant that the AID from the previous trigger event was no longer
    addressed by TD. When the trigger task ended, there was no
    mechanism to cancel this AID. DFHALP therefore reattached a
    trigger transaction under the old AID. As this process repeated,
    more READQs to qzero and more WRITEQs to trigger events took
    place, and the chain of AID storage built up behind the first
    (uncancelled) AID. All the subsequent AID control blocks were
    validly marked as cancelled, since TDRM prepare sets AIDSTTSK
    off in the AID addressed by TDDCTAAD.
    Additional keywords: DESTFAC TERMINAL DESTFAC=TERMINAL
    

Problem conclusion

  • DFHTDRM has been changed to prevent another AID from being
    scheduled in commit processing if there is already an active
    AID addressed from the DCT.
    DFHTDTM has also been changed to ensure any associated AID
    is cancelled correctly during a Discard of a TD Queue.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PK77945

  • Reported component name

    CICSTS V3 Z/OS

  • Reported component ID

    5655M1500

  • Reported release

    400

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2008-12-27

  • Closed date

    2009-03-06

  • Last modified date

    2009-04-02

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

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

    UK44629 UK44630

Modules/Macros

  •    DESTDRM  DESTDTM  DFHTDRM  DFHTDTM
    

Fix information

  • Fixed component name

    CICSTS V3 Z/OS

  • Fixed component ID

    5655M1500

Applicable component levels

  • R400 PSY UK44629

       UP09/03/11 P F903

  • R500 PSY UK44630

       UP09/03/11 P F903

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:
02 April 2009