IBM Support

IT34004: xcsFreeMemFn xecS_I_PRIVATE_MEMORY_ERROR from amqrmppa during thread cleanup.

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APAR status

  • Closed as program error.

Error description

  • When the client or channel connection end, the following failure
    data capture (FDC) record may be generated:
    
    Operating System  :- Linux 3.10.0-1062.18.1.el7.x86_64
    LVLS              :- 9.0.0.10
    Probe Id          :- XC006001
    Component         :- xcsFreeMemFn
    Program Name      :- amqrmppa
    Major Errorcode   :- xecS_I_PRIVATE_MEMORY_ERROR
    Minor Errorcode   :- OK
    
    Probe Type        :- MSGAMQ6091
    Probe Description :- AMQ6091: An internal IBM MQ error has
    occurred
    Arith1            :- 47352551930080 (0x2b11200978e0)
    
    Comment1          :- invalid head tag
    MQM Function Stack
    ccxResponder
    rrxResponder
    ccxReceiveThreadFn
    ccxReceiveThreadCleanup
    cciEndConv
    rriAsyncConvControl
    rriFreeSess
    ccxStageFree
    xcsFreeMemFn
    xcsFFST
    
    The FDC's indicates that the memory being freed has already been
    freed. The UseCount has dropped to 0 so this is why it is freed,
    but the code is not recording this fact fully and once again
    attempts to free it in the ccxStageFree after the conversation
    it cleared.
    

Local fix

  • Changing the SHARECNV value to 0 may help.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    MQ Client or Channel applications with SHARECONV > 1
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    When a client or channel conversation ends, the receive pool
    header buffer was freed and a pointer to the unassigned buffer
    location was not cleared. Later, an attempt was made to free the
    pool header buffer a second time using the stale pointer,
    leading to the FDC indicating an invalid buffer corruption.
    

Problem conclusion

  • The stale pointer is now cleared when the buffer is freed.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 LTS   9.0.0.12
    v9.1 LTS   9.1.0.9
    v9.2 LTS   9.2.0.2
    v9.x CD    9.2.3
    
    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

    IT34004

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-08-25

  • Closed date

    2021-03-24

  • Last modified date

    2021-10-05

  • 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

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0"}]

Document Information

Modified date:
06 October 2021