IBM Support

IT34336: MQGET fails with 2004 MQRC_BUFFER_ERROR

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APAR status

  • Closed as program error.

Error description

  • MQ application fails with MQRC_BUFFER_ERROR and MQ trace
    indicates
    a memory exception(e.g. SIGSEGV) in zstMQGET_CheckParms followed
    by MQRC_BUFFER_ERROR.
    
    Excerpt from MQ trace:
    
     13:38:43.633550    26767.1  --{ zstMQGET_CheckParms
     13:38:43.633572    26767.1       Signal caught during MQI call,
      signal=11 : SIGSEGV: address not mapped(0x137bc)
     13:38:43.633580    26767.1  --}! zstMQGET_CheckParms
    rc=MQRC_BUFFER_ERROR
    

Local fix

  • Specify the buffer size in multiples of 128K(131072 bytes).
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using 32 bit C or C++ applications.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    MQGET API has validation to check the addressability of the
    buffer address specified by the application
    in the MQGET call based on the buffer length. However a defect
    in the validation code caused MQ
    to access an address beyond 4 GB(maximum for 32 bit process and
    the address exceeding 4 GB would be
    less than 4GB in a 32-bit process) resulting in a memory
    exception and the MQGET failing with MQRC_BUFFER_ERROR.
    

Problem conclusion

  • MQ code has been modified to correct the defect in the buffer
    address validation.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 LTS   9.1.0.8
    v9.2 LTS   9.2.0.2
    v9.x CD    9.2.2
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT34336

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-09-23

  • Closed date

    2021-01-22

  • Last modified date

    2021-01-22

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

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

Fix information

  • Fixed component name

    IBM MQ BASE MP

  • Fixed component ID

    5724H7271

Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]

Document Information

Modified date:
23 January 2021