IBM Support

IT26531: FDC reporting xecF_E_UNEXPECTED_SYSTEM_RC, probe ID XC130031 in xihCheckThreadList when multiple threads end concurrently

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • A failure data capture (FDC) record is generated with probe ID
    XC130031 and error code xecF_E_UNEXPECTED_SYSTEM_RC when
    multiple application threads end concurrently without performing
    MQDISC processing.
    
    The stack backtrace shows the following:
    
    mqe!xihCheckThreadList
    mqe!xcsTerminate
    mqe!ziiClearUpAgent
    mqe!zstMQThreadDestructor
    mqe!xppRunDestructors
    mqe!xcsDestroyThread
    mqe!xihCheckThreadList
    mqe!xcsTerminate
    mqe!ziiClearUpAgent
    mqe!zstMQThreadDestructor
    mqe!xppRunDestructors
    mqe!xcsDestroyThread
    mqe!xihCheckThreadList
    mqe!xcsTerminate
    [...]
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of the IBM MQ applications on Windows,
    where multiple MQ-attached application threads terminate or call
    MQDISC concurrently
    
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A logic error meant that it was possible for the
    xihCheckThreadList function to be called recursively, which in
    turn resulted in a null pointer being accessed during MQDISC
    processing.
    

Problem conclusion

  • The IBM MQ client logic has been updated to prevent recursive
    calls to xihCheckThreadList in this scenario.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 CD    9.1.2
    v9.1 LTS   9.1.0.2
    
    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

    IT26531

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-10-08

  • Closed date

    2019-01-31

  • Last modified date

    2019-01-31

  • 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

    5724H7271

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":"9.1","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
31 January 2019