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PH63649: WITHIN A QUEUE SHARING QUEUE MQ TERMINATES AFTER ABEND5C6 REASON CODE 00C5101D IS GENERATED.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • If a new structure is connected to while a connect request is
    deferred, then the new connection can take the deferred
    connection's slot in the CTA. In this case, the QMGR
    successfully connected to structure B while the reconnection
    request to structure A was deferred. When the deferred
    reconnection request awoke and tried to reconnect, it abended
    S5C6-00C5101D in CSQEROUT due to failing a consistency check.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 3 Modification 0 and Release 4       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend 5C6-00C5101D occurs in            *
    *                      CSQELPLM.CSQEROUT, followed by abnormal *
    *                      queue manager termination with          *
    *                      REASON=00C510AB.                        *
    ****************************************************************
    Following an unsuccessful attempt to connect to an application
    structure, the queue manager automatically attempts to reconnect
    to the structure in response to an ENF35 notification, but can
    defer the reconnection attempt. While a connection attempt is
    deferred, the structure can be deleted, and another structure
    created, reusing the old structure's position in the ECTA. When
    the deferred connection was subsequently attempted, the
    5C6-00C5101D abend occurred due to the the reuse of the ECTA
    entry having cleared expected values.
    

Problem conclusion

  • When an application structure is deleted, any deferred
    connection requests are canceled prior to the ECTA entry being
    made eligible for reuse.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH63649

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    300

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2024-10-09

  • Closed date

    2025-07-04

  • Last modified date

    2025-08-02

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

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

    UO03966 UO03967

Modules/Macros

  • CSQE197N CSQELTRS CSQEOCRQ CSQEROUT CSQEWRKT CSQMUCFS
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R300 PSY UO03966

       UP25/07/12 P F507 ¢

  • R400 PSY UO03967

       UP25/07/12 P F507 ¢

Fix is available

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Document Information

Modified date:
02 August 2025