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PI40983: WMQ 800 - ABEND 0C4-00000011 MAY OCCUR IN IEAVEPST DURING TERMINATION OF A WAS SERVANT REGION.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • An ABEND0C4 ABENDS0C4 PIC 11 in IEAVEPST. The POST SVC was
    issued by CSQMEOTC. It was running during termination of an
    async consume thread and was trying to post the termination
    ECB (bloa.AC_ConsumerEndECB) in the control thread's BLOA.
    However, the control thread is ending at the same time, and
    has already released the BLOA, leading to the 0C4.
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abends 0C4 or 102 occur in IEAVPST      *
    *                      (with M=CSQ3SSES in the symptom string) *
    *                      when a WebSphere Application Server     *
    *                      region connected to a queue manager in  *
    *                      bindings mode terminates.               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A WebSphere Application Server is connected to the queue manager
    in bindings mode, and has established one or more asynchronous
    consumers with the queue manager to deliver messages to MDBs.
    When the MDBs terminate during Application Server termination, a
    timing window exists where the asynchronous consumer thread can
    end prior to the MDB thread, but goes through CSQMEOTC (end of
    task processing) after the MDB thread. In this situation, when
    CSQMEOTC attempts to post an ECB in the main task's BLOA it
    abends due to the BLOA having already been freed.
    

Problem conclusion

  • CSQMEOTC and CSQBDSC are changed to correct the code responsible
    for serialising end of task processing for the main and consumer
    threads, ensuring the main task does not free its BLOA prior to
    the consumer task posting the ECB in that BLOA.
    000Y
    CSQBDSC
    CSQMEOTC
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI40983

  • 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

    2015-05-13

  • Closed date

    2015-05-27

  • Last modified date

    2015-08-03

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

    PI31631

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

    UI27961

Modules/Macros

  • CSQBDSC  CSQMEOTC
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI27961

       UP15/07/03 P F507

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:
03 August 2015