IBM Support

IC77707: WebSphere MQ XMS .NET application hangs when the connection is closed.

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The WebSphere MQ XMS application that invokes an MQGET call with
    an infinite wait interval hangs when the connection is closed.
    This problem occurs only if the GET is issued against an alias
    queue. If the application is run as a Windows service then the
    service loops and never ends when the service is stopped.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    WebSphere MQ XMS .NET applications that connect to V7 queue
    managers to retrieve messages from a alias queue.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    If a WebSphere MQ XMS .NET application is connected to a V7
    queue manager to retrieve messages from an alias queue with an
    infinite wait set then the connection does not end if the
    application wishes to close the connection. Before closing the
    connection a notification is sent to the server to cancel the
    wait on the MQGET request. However, if the MQGET is issued on
    an alias queue then the queue manager agent process fails to
    locate the waiter since the list of waiters is prepared based
    on the base queue definition. Hence, the application keeps
    waiting on MQGET and it never ends unless the application
    process is forcefully terminated or the queue manager is
    stopped.
    

Problem conclusion

  • WebSphere MQ code has been modified so that when the queue
    manger agent process receives an MQRC_XWAIT_CANCELED event it
    searches for the base queue definition in the list of waiters
    rather than the alias queue definition.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.7
    --------           --------------------
    Windows            U200333
    
                       v7.1
    Platform           Fix Pack 7.1.0.1
    --------           --------------------
    Windows            7.1.0.1
    
    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

    IC77707

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-07-25

  • Closed date

    2011-10-11

  • Last modified date

    2012-01-16

  • 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 WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R701 PSY

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ63","label":"APAR \/ Maintenance"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0.1","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
16 January 2012