PM90060: DFHMQ0480 MQCC=2 MQRC=2195 ON EVERY REQUEST TO MQ AFTER DISCONNECTING AND THEN RECONNECTING TO MQ

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The following series of events happens:
    1)Your CICS region is connected to MQ and tasks are succesfully
    making MQ calls.
    2)You successfully disconnect CICS from MQ.
    3)You successfully
    re-connect to MQ but now every request to MQ results in
    DFHMQ0480
    .
    This problem happens when the following happens while CICS is
    connected to MQ.
    1)A task makes a call to MQ and then that task ends.  The L8
    TCB used by that task is now free for other tasks to use.
    2)A new task allocates that same L8 TCB for linking to an
    OpenAPI program. This new task does not make any MQ calls, and
    this new task never ends.
    3)While that new task never ends, CICS disconnects from MQ and
    reconnects to MQ.
    .
    For MQ to completely be done with the prior connection, MQ
    needs for the TCBs that have Identified to MQ to end. But since
    that L8 TCB is allocated to a never-ending task, it doesn't
    end. This causes MQ to fail each request from this CICS region
    with MQRC MQRI_COORD_HAS_TERMINATED (8503). However this return
    code is overlayed with 2195 prior to CICS taking the DFHMQ0480
    dump. CICS should put the original MQ reason code in the
    message or at least save the original MQ reason code somewhere
    before taking the dump.
    
    
    
    
    
    
    Additional Symptom(s) Search Keyword(s): KIXREVDWZ
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: DFHMQ0480 with MQCC=2 and MQRC=2195     *
    *                      received on all requests to WMQ after   *
    *                      disconnecting then reconnecting to WMQ. *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    CICS is connected to IBM WebSphere MQ and an instance of CKTI
    (the CICS-WMQ trigger monitor or task initiator) is started.
    However the initiation queue specified is invalid. As a result
    CKTI issues messages DFHMQ0101 and DFHMQ0110, and then
    terminates.
    Later CICS is disconnected from WMQ, which attempts to detach
    from all TCBs which have performed WMQ work. The TCB which was
    earlier used to run the CKTI task is now being used by a long
    running task elsewhere in CICS. As a consequence the CICS-WMQ
    connection does not close.
    Any subsequent WMQ requests will fail with message DFHMQ0480.
    Keywords: msgDFHMQ0480 MQRC_UNEXPECTED_ERRORMQINI INITQ
              msgDFHMQ0101 MSGDFHMQ0110
    

Problem conclusion

  • DFHMQTSK has been modified such that after a failed attempt to
    open the WMQ initiation queue, the TCB that the CKTI task is
    running under is freed on task termination. As a result the TCB
    cannot be used by another task and therefore the CICS-WMQ
    connection can close.
    

Temporary fix

  •             *********
                * HIPER *
                *********
    FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PM90060

  • Reported component name

    CICS TS Z/OS V4

  • Reported component ID

    5655S9700

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-30

  • Closed date

    2013-09-16

  • Last modified date

    2013-10-03

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

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

    PM96275 UK97724

Modules/Macros

  •    DFHMQTSK
    

Fix information

  • Fixed component name

    CICS TS Z/OS V4

  • Fixed component ID

    5655S9700

Applicable component levels

  • R700 PSY UK97724

       UP13/09/26 P F309

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:

CICS Transaction Server

Software version:

4.2

Reference #:

PM90060

Modified date:

2013-10-03

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