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IT21151: Intermittent queue manager connection failures from MQ processesand services

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • MQ  processes or services(e.g. AMQP) intermittently fail to
    connect to the QM causing unexpected failures(e.g. termination
    of process and/or service), one or more failure data capture
    files are generated prior to failures, with identifying
    characteristics as follows:
    
    * FDCs with Probe Ids XC501006 and XC015003
    * MQ services(e.g. AMQP) if running and affected might terminate
    unexpectedly
    
    Probeid: XC501006
    Component name: xlsThreadPreInitialization
    Error: xecS_E_INVALID_HQCB.
    
    FDC Summary:
    
     2019/12/26 11:02:24.377489 amqrmppa 9780 10 XC015003
    xcsFreeQuickCell           xecL_E_INVALID_HANDLE
     2019/12/26 11:02:24.383503 amqrmppa 9780 10 XC501006
    xlsThreadPreInitialization xecS_E_INVALID_HQCB
     2019/12/26 11:02:24.390367 amqrmppa 9780 10 XC015003
    xcsFreeQuickCell           xecL_E_INVALID_HANDLE
     2019/12/26 11:02:24.397458 amqrmppa 9780 10 XC501006
    xlsThreadPreInitialization xecS_E_INVALID_HQCB
     2019/12/26 11:02:24.403949 amqrmppa 9780 10 XC501006
    xlsThreadPreInitialization xecS_E_INVALID_HQCB
     2019/12/26 11:02:38.789683 amqrmppa 9780 11 XC501006
    xlsThreadPreInitialization xecS_E_INVALID_HQCB
    
     QM Error message:
    
     12/26/2019 11:08:42 AM - Process(9780.10) User(mqm)
    Program(amqrmppa)
                        Host(host1) Installation(Installation1)
                        VRMF(8.0.0.4) QMgr(QM1)
    
    AMQ9508: Program cannot connect to the queue manager.
    
    EXPLANATION:
    The connection attempt to queue manager 'QM1 failed with reason
    code
    2195.
    ACTION:
    Ensure that the queue manager is available and operational.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using AMQP service.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The workload pattern of the AMQP listener within the MQ queue
    manager could cause an internal variable to overflow over time.
    Such an overflow caused unexpected failures and resulted in the
    abnormal termination of the AMQP service.
    

Problem conclusion

  • The MQ queue manager has been updated, such that the logic
    handling this variable prevents the overflow.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.8
    v9.0 LTS   9.0.0.2
    
    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

    IT21151

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-06-23

  • Closed date

    2017-07-17

  • Last modified date

    2020-01-13

  • 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

    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:
13 January 2020