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PI45278: MULTIPLE AICJ ABENDS DUE TO QPF CELL CORRUPTION

A fix is available

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APAR status

  • Closed as program error.

Error description

  • This problem may also manifest itself as a DFHSM0002 Severe
    Error code x'30D'. It can be preceded by multiple application
    abends just prior to the issue.
    The AICJ abends and the DFHSM0002 dump are a result of
    recurring QPF cell corruption, where the second digit of the
    QPF has been altered so that the full address doesn't point
    back to the SCA.
    In the trace you see the entry pointing to the invalid QPF:
    SM 030D SMGF  *EXC* Quickcell_getmain_invalid_QPF
    The QPF is invalid due to CICS thinking that it is incrementing
    the storage violation count in a TCTTE when the task is
    actually a non-terminal task (thus it would not have a TCTTE).
    Additional Symptom(s) Search Keyword(s): SM0002, DFHTFIQ, ICE
    KIXREVEPH
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS Users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Message "DFHPG0001 An abend (code       *
    *                      0C4/AKEA) has occurred at offset        *
    *                      X'8C40' in module DFHPGCR." is issued   *
    *                      due to corruption of a QPF.             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DFHSMAR detects a storage violation in a task that was attached
    by an EXEC CICS START with no TERMID specified and issues
    message DFHSM0102 to report this.
    During the processing of the DFHSM0102 message DFHTFIQ is
    called for SET_TERMINAL_FACILITY to increment the storage
    violation count (TCTTESCV) in the TCTTE.
    There is no terminal for this transaction and the facility
    address points to an ICE control block. This is shorter than
    a TCTTE and the offset of field TCTTESCV is beyond the
    end of the ICE, so the storage following is corrupted. In this
    case the storage beyond the ICE contains a QPF (quickcell page
    free element) and the corruption results in an abend 0C4 in
    module DFHPGCR when CICS attempts to use the QPF.
    
    Additional keywords: MsgDFHPG0001 PG0001 abend0C4 S0C4
    abendS0C4 unpredictable results AICJ abendAICJ SM0002
    msgDFHSM0002 xmiq_start xmiq_none
    

Problem conclusion

  • DFHTFIQ has been altered so if the facility type is an ICE
    (START without a terminal) or if there is no facility then
    it will return an EXCEPTION response with a reason of
    NO_TERMINAL and will not attempt to update the storage
    violation count in the tctte.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PI45278

  • Reported component name

    CICS TS Z/OS V5

  • Reported component ID

    5655Y0400

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-07-20

  • Closed date

    2015-10-02

  • Last modified date

    2020-09-04

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

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

    UI31751 PH29190

Modules/Macros

  • DFHTFIQ
    

Fix information

  • Fixed component name

    CICS TS Z/OS V5

  • Fixed component ID

    5655Y0400

Applicable component levels

  • R900 PSY UI31751

       UP15/10/08 P F510

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:
05 September 2020