PM61006: DUMP TITLE=CSQ1,ABN=0C4-00000038,U=SYSOPR ,C=R3600.7xx.SSSC-CS Q3REPL,M=CSQ3RRSF,LOC=CSQVSRX .CSQVSRX +xxxxxxxx

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The customer was running a WMQ V7 QMGR on a
    system in which RRS was cancelled. The gmgr on that image took
    two abend0C4-38 dumps although the qmgr did not terminate.
    .
    DUMP TITLE=CSQ1,ABN=0C4-00000038,U=SYSOPR  ,C=R3600.7xx.SSSC-CS
               Q3REPL,M=CSQ3RRSF,LOC=CSQVSRX .CSQVSRX +xxxxxxxx
    .
    Looking at the LOGREC, I can see there are two
    abend058-00000004 but they are suppressed by a slip.
    .
    SYMPTOM             DESCRIPTION
    -------             -----------
    PIDS/5655R3600      PROGRAM ID: 5655R3600
    RIDS/CSQ3REPL#L     LOAD MODULE NAME: CSQ3REPL
    RIDS/CSQ3RRSR       CSECT NAME: CSQ3RRSR
    AB/S0058            SYSTEM ABEND CODE: 0058
    PRCS/00000004       ABEND REASON CODE: 00000004
    RIDS/RRSRFRR#R      RECOVERY ROUTINE CSECT NAME: RRSRFRR
    .
    There are two abend0C4-00000038 for the same EB right
    after the abend058-4 which is found in VERBX LOGDATA
    .
    The Change Team reviewed the dumps and they can see the cause
    of the problem. RRS was cancelled and restarted, which resulted
    in CSQ3RRST being invoked to resync with RRS. CSQ3RRST invoked
    CSQ3RRSR to perform the resync. CSQ3RRSR issue a resync call to
    RRS, but this abended with 058 RC4 as the RRS address space had
    again ended. The abend was handled by CSQ3RRSR's recovery
    routine which reloaded the current EB address into R6. However,
    it left the high word of the register dirty (as the system
    is running with IEAINITREGSTASK it contained xFFFFFFFF). This
    caused subsequent problems when CSQVSRX was invoked as it
    switched to amode 64 and attempted to reference the EB using
    GR6.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 0 Modification 1 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: An abend occurs during RRS resync       *
    *                      processing followed by the QMGR         *
    *                      abending with S0C4-38, which can happen *
    *                      repeatedly.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If an abend happens during RRS resync processing in CSQ3RRSR in
    the QMGR, the recovery routine for that module is invoked. It
    percolates the abend to CSQ3RRST's recovery routine, which will
    set return parameters before retrying. In doing so, it sets the
    low word of register 6 to the current EB address. However the
    high word contains some non-zero residue value, causing CSQVSRX
    to attempt getting an invalid memory address, causing the
    S0C4-38 abend.
    

Problem conclusion

  • CSQ3RRST's recovery routine was changed to set the register 6
    value with 64 bits, setting the high word to 00000000. This
    allows the attempt to access the memory in CSQVSRX to succeed
    successfully.
    010Y
    100Y
    CSQ3RRSF
    CSQ3RRSR
    

Temporary fix

Comments

  • ž**** PE13/03/08 FIX IN ERROR. SEE APAR PM80088  FOR DESCRIPTION
    

APAR Information

  • APAR number

    PM61006

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    010

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-03-22

  • Closed date

    2012-07-10

  • Last modified date

    2013-03-18

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

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

    UK80193 UK80194

Modules/Macros

  •    CSQ3RRSF CSQ3RRSR
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R010 PSY UK80193

       UP12/07/26 P F207

  • R100 PSY UK80194

       UP12/07/26 P F207

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


More support for:

z/OS family

Software version:

7.0.1

Reference #:

PM61006

Modified date:

2013-03-18

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