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PI26164: WMQ V710 - QMGR HANG DURING SHUTDOWN PROCESSING. SSIDMSTR ADDRESS SPACE HAD TO BE CANCELLED.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • After a DELETE CFSTRUCT command the structure is not
    disconnected. This prevents the QMGR from being terminated
    and hangs during shutdown processing.
    
    The master region had to be cancelled.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Shutdown of a queue manager may hang    *
    *                      after a coupling facility structure is  *
    *                      deleted, and later structures defined   *
    *                      resulting in the structure number being *
    *                      reused. This occurs when the structure  *
    *                      task associated with the deleted        *
    *                      structure does not disconnect due to    *
    *                      the expiry processor not decrementing   *
    *                      SCB_OPEN_COUNT.                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Shared queue expiry processing can result in the open count
    for a structure being incremented but not decremented. This
    can result in the structure task for the structure not
    releasing the connection ENQ when the structure is deleted. If
    the structure is then redefined, other tasks will not be able to
    gain the connection ENQ for the structure. This will result in
    hangs in various locations, such as DELETE QLOCAL commands.
    This can also result in a hang in the queue manager during
    shutdown.
    

Problem conclusion

  • Expiry processing has been updated to correctly handle the
    CSQERsnCodeNoEntry reason code from CSQEREXP, allowing the
    queue to be correctly closed and SCB_OPEN_COUNT to represent
    the correct value. This results in the structure tasks correctly
    disconnecting from the deleted structure in this scenario.
    100Y
    CSQISCX6
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI26164

  • 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

    2014-09-23

  • Closed date

    2015-01-29

  • Last modified date

    2015-04-02

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

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

    PI32906 UI24767

Modules/Macros

  • CSQISCX6
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UI24767

       UP15/03/04 P F503

Fix is available

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Document Information

Modified date:
02 April 2015