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IT32924: MQ Client abends in MQCTL when accessing AMS message, generatingFDC with Probe XC130031 - Access Violation

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • An MQ Async Consumer Client, such as IIB, crashes when accessing
    an empty, AMS-protected queue.
    
    An FDC is generated with the following details:
    
     Probe Id     :- XC130031
     Component     :- xehExceptionHandler
     Major Errorcode  :- xecF_E_UNEXPECTED_SYSTEM_RC
     Minor Errorcode  :- OK
     Probe Type    :- MSGAMQ6119
     Probe Severity  :- 2
     Probe Description :- AMQ6109S: An internal IBM MQ error has
    occurred.
     FDCSequenceNumber :- 0
     Comment1     :- Access Violation at address 0000000000000008
    when reading
    
    XC130031 Access Violation at address 0000000000000008
    
    As a result of a Severe Abend Error, a MiniDump has been
    written to: AMQxxxx.5012.0.dmp
    
    MQM Function Stack:
    MQCTL
    MQCTL
    rpqMQCTL
    rpqStartWait
    rpqDispatchThreadFn
    rpqProcessQueues
    rpqProcessQueues
    rpqCallConsumer
    rpqCallCallback
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of MQ's Async Consumer Client functionality, with the
    MQOP_START_WAIT
    operation mode for MQCTL (for example, IIB), alongside AMS
    message protection.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    An error in the MQ code resulted in the handling of a bad
    pointer, which
    caused an access violation.
    

Problem conclusion

  • The error has been corrected so that the offending pointer is
    correctly
    handled to prevent an access violation occurring.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 LTS   9.1.0.7
    v9.x CD    T.B.C.
    
    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

    IT32924

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    904

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-05-19

  • Closed date

    2020-06-16

  • Last modified date

    2020-06-22

  • 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 M/P

  • Fixed component ID

    5724H7261

Applicable component levels

  • R904 PSY

       UP

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Document Information

Modified date:
21 November 2021