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PI23389: ABN=5C6-00C51054,C=R3600.710.CFM -CSQEOSQ ,M=CSQGFRCV, LOC=CSQELPLM.CSQEOSQ +00000E1A FOR NON SCM STRUCTURE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABN=5C6-00C51054,C=R3600.710.CFM -CSQEOSQ ,M=CSQGFRCV,
    LOC=CSQELPLM.CSQEOSQ +00000E1A
    
    PI13080 is only applicable to structures that are using SCM.
    This problem occurs when trying to open a shared queue for the
    first time, and the queue is also being opened for the first
    time on another queue maanger. There is a window in which there
    is no LHQC for the list-header in question (old LHQC deleted by
    the other queue manager before writing the new LHQC).
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Opening a shared queue within a short   *
    *                      period of time on two different queue   *
    *                      managers can result in one of the       *
    *                      MQOPEN calls failing MQRC 2195          *
    *                      (MQRC_UNEXPECTED_ERROR) and the queue   *
    *                      manager abending 5C6-00C51054 in        *
    *                      CSQEOSQ.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Opening a shared queue for the first time results in a list
    header being created for the queue within the CF structure. In
    the case where two queue managers are attempting to open the
    same shared queue for the first time, if the process attempts to
    reuse a previously freed list header, the open processing may
    fail on one of the queue managers, and it may abend
    5C6-00C51054.
    
    When open processing attempts to reuse a list header, it may
    find a previously used LHQC marked for deletion. This is
    expected and it is deleted, and a new one is created. However a
    timing window exists for the case where two queue managers
    attempt to open a shared queue for the first time. If one queue
    manager deletes the LHQC, and the second queue manager attempts
    to read the LHQC, after finding one exists, the read fails with
    CsqeRsnCodeNoEntry. This results in the open failing, with MQRC
    2195 (MQRC_UNEXPECTED_ERROR) and the queue manager will abend.
    

Problem conclusion

  • Processing for opening a shared queue has been updated to handle
    this timing window. if the read of the LHQC fails, the initial
    checks are retried, to allow the MQOPEN to succeed.
    100Y
    CSQEOPEN
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI23389

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2014-08-06

  • Closed date

    2014-12-09

  • Last modified date

    2015-02-03

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

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

    PI29776 UI23718

Modules/Macros

  • CSQEOPEN
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UI23718

       UP15/01/16 P F501

Fix is available

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Document Information

Modified date:
03 February 2015