IBM Support

IV22632: WEBSPHERE MQ 7.1 REPOSITORY CACHE INITIALIZATION CAN CAUSE SIGSEGV IN ZXCCREATECACHESHELL

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • There is an issue relating to the repository cache
    initialisation at MQ 7.1 that can lead to a SIGSEGV for very
    large repository queue sizes, and prevention of queue manager
    restart. FDC produced is-
    .
    Probe Id          :- XC130004
    Application Name  :- MQM
    Component         :- xehExceptionHandler
    Program Name      :- amqzxma0
    Major Errorcode   :- STOP
    Minor Errorcode   :- OK
    Probe Type        :- HALT6109
    Probe Description : AMQ6109: An internal WebSphere MQ error
    has occurred
    FDCSequenceNumber :- 0
    Arith1            :- 11 (0xb)
    Comment1          :- SIGSEGV: invalid address permissions
    .
    MQM Function Stack
    ExecCtrlrMain
    zxcStartupLogic
    zxcPostInitialiseSetup
    zxcCreateRepositoryCache
    zxcCreateCacheShell
    xcsFFST
    .
    MQM Trace History
    .
    .
    .
    -{ xcsAllocateMemBlock
    --{ xstAllocateMemBlockFromHeap
    Data: 0x00000001 0x00000000 0x00000000 0x004a6d88
    --} xstAllocateMemBlockFromHeap rc=OK
    -} xcsAllocateMemBlock rc=OK
    -{ xlsRequestMutex
    -} xlsRequestMutex rc=OK
    -{ xlsReleaseMutex
    -} xlsReleaseMutex rc=OK
    } xcsCreateSharedMemSet rc=OK
    { xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    You may be affected by this problem if you are using MQ 7.1 and
    have an exceptionally large SYSTEM.CLUSTER.REPOSITORY.QUEUE when
    attempting to start a queue manager. The queue would need to be
    about 4Gb or more in size to encounter this problem.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    The problem is caused by failure to properly handle internal
    repository sizing calculations correctly when close to the
    internal repository size limit of 4Gb.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IV22632

  • Reported component name

    WMQ LIN X86 V7

  • Reported component ID

    5724H7224

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-06-08

  • Closed date

    2012-06-29

  • Last modified date

    2014-12-01

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

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

    PM67921

Fix information

  • Fixed component name

    WMQ LIN X86 V7

  • Fixed component ID

    5724H7224

Applicable component levels

  • R710 PSY

       UP

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.1"}]

Document Information

Modified date:
09 March 2021