IBM Support

IT29442: Memory exception in atmRecoveryAcquireDataMutex followed by Object Damage error AMQ7472

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APAR status

  • Closed as program error.

Error description

  • The amqzlaa0 process encountered memory exception during the
    recovery of a queue operation
    and marked the queue as damaged. The following failure data
    capture (FDC) records were generated.
    
    XC307030 xlsRequestMutex                 xecL_W_SEM_OWNER_DIED
    XC130004 xehExceptionHandler/atmRecoveryAcquireDataMutex  STOP
    AQ051000 aqsStartQOp                                  STOP_ALL
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    All users of IBM MQ
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    During the recovery of a queue operation the queue manager
    process amqzlaa0 was trying to dereference a NULL transaction
    identifier causing a memory exception.
    
    NULL transaction identifiers are expected to be used internally
    to the queue manager under certain circumstances including some
    non-persistent messaging operations and channel scratchpad
    updates.
    

Problem conclusion

  • MQ code has been modified to prevent amqzlaa0 process accessing
    a NULL transaction identifier during the recovery of the queue
    operation.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.14
    v9.0 LTS   9.0.0.8
    v9.1 CD    9.1.4
    v9.1 LTS   9.1.0.4
    
    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

    IT29442

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-06-13

  • Closed date

    2019-09-27

  • Last modified date

    2019-10-02

  • 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 MP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
02 October 2019