IBM Support

IT17083: Internal errors reported during failover after a health check thread detects a problem with the file system.

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APAR status

  • Closed as program error.

Error description

  • IBM MQ fails over after a health check thread detects a
    problem with the file system.
    
    During the failover, an unexpected Failure Data Capture (FDC)
    record with these details is generated:
    
    | Probe Id          :- XC333002
                                                  |
    | Thread            :- 13    LivenessMonitor
                                     |
    | Probe Description :- AMQ6109: An internal WebSphere MQ error
    has occurred.  |
    
    MQM Function Stack
    zxcLivenessMonitorThread
    zxcInquireAndUpdateStatus
    xlsPostEvent
    xcsFFST
    
    } xlsWaitEvent rc=xecL_W_TIMEOUT
    { hlgQueryNamedLSN
    } hlgQueryNamedLSN rc=OK
    { hlgQueryNamedLSN
    } hlgQueryNamedLSN rc=OK
    { zxcInquireAndUpdateStatus
    -{ zapInquireAndUpdateStatus
    -} zapInquireAndUpdateStatus rc=OK
    -{ xlsPostEvent
    -} xlsPostEvent rc=OK
    -{ xlsPostEvent
    --{ xcsFFST
    

Local fix

  • This problem will normally follow a period where a shared file
    system becomes unavailable.  If the reason for this can be
    determined and corrected then the error can be avoided.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of multi-instance queue managers may be affected by this
    issue
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    When using multi-instance queue managers, MQ uses a liveness
    monitor thread that tests that the queue manager is responsive
    to requests.  If the queue manager is no longer responsive, if
    for example it loses a connection to a shared file system, then
    the queue manager is supposed to end.
    
    During this sequence of events an unexpected additional error
    condition occurred due to a queue manager resource being
    unavailable from the liveness monitor thread. This unexpected
    additional error condition was reported by the Failure Data
    Capture (FDC) record above.
    

Problem conclusion

  • The IBM MQ code was corrected so that the necessary queue
    manager resource was available to the liveness monitor thread.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.6
    v9.0 CD    9.0.2
    v9.0 LTS   9.0.0.1
    
    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

    IT17083

  • 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

    2016-09-16

  • Closed date

    2016-10-25

  • Last modified date

    2017-06-01

  • 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

  • R800 PSY

       UP

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Document Information

Modified date:
01 June 2017