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PH05676: IBM MQ ABEND0C4 00000010 LOC=CSQXRCTL CSQXBPAL

A fix is available

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APAR status

  • Closed as program error.

Error description

  • User reports abend with symptom string returned
    ABN= 0C4-00000010,LOC=CSQXRCTL.CSQXBPAL
    Change Team finds the problem occurs when a client application
    issues an MQGET with MQGMO_PROPERTIES_IN_HANDLE, and the
    combined length of the message data and message properties is
    larger than the staging buffer originally allocated by the
    CHINIT.
    In function rriAddMPHToAPIReply, MQ attempts to allocate a
    larger buffer, but the calculation of the required buffer
    size is incorrect and results in a buffer which is still too
    small. The processing then goes on to copy data beyond the end
    of the allocated buffer causing a storage overlay.
    During the Hursley recreate the overlay goes into unallocated
    storage and results in a dump with the symptom string :
    ABN=0C4-00000011,M=CSQXDISP,
    LOC=CSQXRCTL.CMQXRSRV
    In the user reported case the storage beyond the end of the
    buffer was allocated, so the overlay corrupted the data in that
    storage and caused the various 0C4 abends reported.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0, Release 1          *
    *                 Modification 0 and Release 2 Modification 0. *
    ****************************************************************
    * PROBLEM DESCRIPTION: Storage overlay in the channel          *
    *                      initiator address space leading to      *
    *                      unpredictable symptoms including:       *
    *                                                              *
    *                      - S0C4 abends                           *
    *                      - client connections failing with       *
    *                      MQRC_CHANNEL_NOT_AVAILABLE (2537)       *
    *                      - channels terminating or hanging       *
    ****************************************************************
    While returning a message containing message properties,
    rriAddMPHToMQIReply was called to add the properties to the
    reply transmission.
    The chinit detected that the existing buffer was not large
    enough to contain the properties, and attempted to allocate
    a new buffer. However an error caused the new buffer to
    be too small.
    When the properties were copied to this buffer, they were copied
    to storage beyond the end of the new buffer, leading to
    potential storage overlay and/or abend 0C4.
    

Problem conclusion

  • rriAddMPHToMQIReply has been changed to ensure a staging area
    that is big enough to contain the message and properties is
    correctly allocated.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH05676

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-11-23

  • Closed date

    2021-05-14

  • Last modified date

    2021-06-02

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

    PH00443

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

    UI60629 UI60630 UI75408

Modules/Macros

  • CMQXRSRV
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R200 PSY UI75408

       UP21/05/29 P F105 ¢

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 June 2021