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PH06218: HANG WAIT WHEN MULTIPLE TASKS REQUESTING AN AMS SERVICE FIND THERE ARE NO AVAILABLE TASKS.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Batch job not getting cpu.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Applications using AMS hang when        *
    *                      insufficient AMS worker tasks are       *
    *                      available.                              *
    ****************************************************************
    When an application accesses an AMS protected queue, requests
    are passed to worker tasks in the AMSM address space. If no
    tasks are available when a request is made, the request is
    added to a chain for processing when a task becomes available,
    either due to completing an inflight request, or due to a new
    task being started.
    An error in the chaining logic for some request types can lead
    to those requests being incorrectly removed from the chain of
    pending work. This results in those requests never being
    processed, and the task requesting them remaining hung.
    

Problem conclusion

  • The chaining logic in CSQ0KRPT and CSQ0KRUP is changed to
    prevent the requests being incorrectly dechained.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH06218

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    010

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-12-06

  • Closed date

    2019-05-13

  • Last modified date

    2019-07-01

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

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

    UI62971

Modules/Macros

  • CSQ0KRPT CSQ0KRUP
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R100 PSY UI62971

       UP19/06/06 P F906 ¢

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.



Document information

More support for: IBM MQ

Software version: 010

Reference #: PH06218

Modified date: 01 July 2019