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PM15975: DFHAP0001 ABEND (CODE 0C1/AKEA) OR 0C4 IN DFHMQCON DURING CICS START UP JUST AFTER MESSAGE DFHMQ0307. 10/06/08 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Sometimes during restart of a CICS region an 0C1 in Module
    DFHMQCON occurs during connection to MQ-Series (V6)
    The CICS TS 4.1 message log shows :
    DFHMQ0307  CICS1234 Successful connection to queue manager MQT4
                        release 0600 group MQTS
    DFHAP0001  CICS1234 An abend (code 0C1/AKEA) has occurred at
    offset X'FFFFFFFF' in module DFHMQCON
    Another time an abend 0c4 occurs :
    DFHAP0001 CICS5678 An abend (code 0C4/AKEA) has occurred at
    offset X'FFFFFFFF' in module DFHMQCON.
    Another time an abend 0c6 occurs :
    DFHAP0001 CICS5678 An abend (code 0C6/AKEA) has occurred at
    offset X'FFFFFFFF' in module DFHMQCON.
    
    .
    The failing transaction is always CPLT and this task
    has picked up a register save area from the CICS CSA
    (CSAOSRSA).
    Just prior to issuing the DFHMQ0307 message in DFHMQCON (during
    which we go into the WAIT) we had previously issued a DFHDSAT
    macro call to perform RELEASE_OPEN_TCB function and that set
    R13 to point at the CSA. After that call R13 should have been
    reset to point to EISTG and failure to reset R13 led to
    an incorrect register save area getting loaded causing 0c1 / 0c4
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS Transaction Server for z/OS V3.2    *
    *                 users who have applied PTF UK55399.          *
    ****************************************************************
    * PROBLEM DESCRIPTION: Various program checks in DFHMQCON      *
    *                      during connect processing.              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DFHMQCON fails to reset R13 to address the EISTG before issuing
    a CICS message.  When DFHMQCON issues message DFHMQ0307,
    register 13 is still addressing the CSA and its register save
    area.  During processing of the DFHMQ0307 message, DFHMQCON is
    suspended.  Another task gets control which also uses the CSA
    register save area and doing so corrupts DFHMQCON's registers
    leading to the program checks.
    

Problem conclusion

  • UK55399
    
    DFHMQCON has been changed to correctly restore the EISTG
    address into R13 after each function call.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PM15975

  • Reported component name

    CICSTS V3 Z/OS

  • Reported component ID

    5655M1500

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-06-07

  • Closed date

    2010-06-24

  • Last modified date

    2010-12-22

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

    PM14115

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

    UK58173

Modules/Macros

  •    DFHMQCON
    

Fix information

  • Fixed component name

    CICSTS V3 Z/OS

  • Fixed component ID

    5655M1500

Applicable component levels

  • R500 PSY UK58173

       UP10/06/29 P F006

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:
22 December 2010