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PI45438: WMQ Z/OS: ABEND5C6-00D40017 IN CSQMOPNI OR CSQMCLS2

A fix is available

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APAR status

  • Closed as program error.

Error description

  • An application creates shared dynamic queues and puts messages.
    After the messages are read, the queues are deleted.
    
    Intermittently, one or more abends occur:
    
    ABN=5C6-00C90C00,LOC=CSQILPLM.CSQIDGET
    ABN=5C6-00D40017,LOC=CSQMLPLM.CSQMOPNI
    ABN=5C6-00D40017,LOC=CSQMLPLM.CSQMCLS2
    
    The problem is a timing issue in the processing in two queue
    managers in the Queue Sharing Group (QSG).
    
    On one queue manager, an application is opening a new permanent
    dynamic shared queue, and the thread is in the process of
    creating the Coupling Facility (CF) list header entry for the
    queue.
    
    On another member of the QSG, the CF structure is being opened
    for the first time since the queue manager started, and the
    queue manager is attempting to resynchronise the contents of
    the CF structure with the in-storage queue objects and the
    contents of DB2.
    
    The timing issue leads to the abend.
    
    Additional Symptom(s) Search Keyword(s):
    ABEND5C6 ABENDS5C6 5C6 S5C6 S05C6
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Creation and deletion of shared dynamic *
    *                      queues can lead to various abends when  *
    *                      one qmgr is resynchronising, e.g:       *
    *                      Abend 5C6-00D40017 in CSQMOPNI,         *
    *                      Abend 5C6-00C90C00 in CSQIDGET,         *
    *                      Abend 5C6-00D40017 in CSQMCLS2          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    One queue manager in a Queue Sharing Group (QSG) creates a new
    shared dynamic queue. At the point at which it has created the
    CF list header entry, another qmgr, resynchronising DB2 and
    CF structure contents, deletes the newly created LHQC since
    it was originally marked for deletion and has the same list
    header number. When the first qmgr tries to update the new
    queue, the LHQC has now been deleted from the CF structure.
    The update fails and the 5C6 abends occur.
    

Problem conclusion

  • The fixed code no longer deletes the LHQC during
    resynchronisation.
    000Y
    CSQEDB2R
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI45438

  • Reported component name

    WMQ Z/OS 8

  • Reported component ID

    5655W9700

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-07-22

  • Closed date

    2015-08-14

  • Last modified date

    2015-10-02

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

    PI30860

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

    UI30224

Modules/Macros

  • CSQEDB2R
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI30224

       UP15/09/09 P F509

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 October 2015