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IT18666: Queue manager ends unexpectedly due to memory exception FDC probe XC130003 under apiCheckpointMemoryObjects

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APAR status

  • Closed as program error.

Error description

  • The queue manager ends unexpectedly.  The issue is recorded in
    FDC records with probe XC130003 xehExceptionHandler.  The call
    stack includes apiCheckpointMemoryObjects and mqlWriteLogRecord.
     The process is amqzmuc0.
    
    Probe Id          :- XC130003
    Component         :- xehExceptionHandler
    Program Name      :- amqzmuc0
    Arith1            :- 11 (0xb)
    Comment1          :- SIGSEGV: address not mapped((nil))
    
    MQM Function Stack
    zmuThreadMain
    zmuCheckpointTask
    alsCheckPointLoop
    aocPerformCheckpoint
    apiCheckpointMemoryObjects
    almLogIt
    hlgWriteLogRecord
    mqlWriteLogRecord
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Queue managers that are members of a cluster.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The queue manager's checkpoint code writes data to the queue
    manager's logs, including some MQ internal data relating to the
    cluster transmission queue(s) in use for each cluster channel.
     In this case some data that was logically "deleted" was being
    written to the logs, but should not have been.  Because of a
    code error, a null pointer was used and this resulted in a
    memory exception and the ending of the amqzmuc0 process which
    contains crucial queue manager internal operations.  The queue
    manager then ended immediately because of this.
    

Problem conclusion

  • The MQ code has been corrected so that logically "deleted"
    objects are not written to the logs during checkpoint
    processing.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.8
    
    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

    IT18666

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7241

  • Reported release

    750

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-01-05

  • Closed date

    2017-04-20

  • Last modified date

    2017-12-04

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7241

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ63","label":"APAR \/ Maintenance"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
04 December 2017