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SE63875: FDC Probe id XC006001 generated at IBM MQ V8

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Application job running at v8 may generate an FDC with probe id
    XC006001 in the agent thread.
    The user profile has to be part of a group that contains many
    user profiles, in this case there are over 50000 users profile
    in the group. (Likely, more than 3000 user profiles in a group
    would be enough) An FDC may be generated for each user for each
    queue manager, but only the first time the user connects to the
    QM.
    
    FDC
    LVLS :- 8.0.0.4
    Product Long Name :- WebSphere MQ for IBM i
    License Type :- Production
    Probe Id :- XC006001
    Component :- xcsFreeMemFn
    SCCS Info :- /build/p800_P/src/lib/cs/amqxspga.c,
    Line Number :- 685
    Build Date :- Oct 17 2015
    Build Level :- p800-004-151017
    UserID :- 00086614 (QMQM)
    Job Name :- 343395/QMQM/AMQZLAA0 (AMQZLAA0)
    Job Description :- QMQM/AMQZLAA0
    Submitted By :- 343376/QMQM/AMQZXMA0
    Activation Group :- 17 (QMQM) (QMQM/AMQZLAA0)
    Major Errorcode :- xecS_I_PRIVATE_MEMORY_ERROR
    Minor Errorcode :- OK
    Probe Type :- MSGAMQ6091
    Probe Severity :- 4
    Probe Description :- AMQ6091: An internal WebSphere MQ error
    has occurred.
    Arith1 :- 1309250240 0x'4e0992c0'
    Arith2 :- 0
    Comment1 :- invalid head tag
    
    MQM Function Stack
    zlaMainThread
    zlaProcessMessage
    zlaProcessMQIRequest
    zlaMQCONN
    zsqMQCONN
    kpiMQCONN
    kqiAuthorityChecks
    gpiCheckObjectAuthority
    zfu_as_CheckObjectAuthority
    zfu_as_CalculateAuthority
    zfu_as_searchprincipallist
    zfuGetAndAddPrincipal
    xcsFreeMemFn
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    IBM MQ V8 users on systems where a group profile can contain
    more than 3000 members
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    If a user profile attempts to connect to a queue manager AND is
    a member of a group which contains more than 3000 profiles, an
    FDC in xcsFreeMemFn can be generated. This occurs when a memory
    block has to be resized to accommodate this large number of
    profiles and the subsequent 'free' of the memory block results
    in a 'double free' condition.
    

Problem conclusion

  • IBM MQ code has been modified to properly account for a memory
    block that has been resized so that it can be freed correctly.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.5
    
    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

    SE63875

  • Reported component name

    WMQ ISERIES V8.

  • Reported component ID

    5724H7254

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-21

  • Closed date

    2016-01-26

  • Last modified date

    2016-01-26

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

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

Modules/Macros

  • RCHMGR
    

Fix information

  • Fixed component name

    WMQ ISERIES V8.

  • Fixed component ID

    5724H7254

Applicable component levels

  • R800 PSY

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Document Information

Modified date:
26 January 2016