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IV43442: Five minute hang then connection-broken on JMS client channel caused by error in the queue manager SVRCONN channel

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APAR status

  • Closed as program error.

Error description

  • A queue manager had a CCSID of 932, and a WebSphere MQ JMS
    client was connecting to it.  A non-existent SVRCONN channel
    name was supplied by the user.  The server-side channel program
    failed to handle fully the initial handshaking with the client.
    The server-side channel program should have sent response data
    to the client indicating that the channel name was incorrect,
    but instead it incorrectly waited for more data from the client.
    This caused a 5 minute period where nothing happened, because
    all this time the client was waiting for a response from the
    server.  The experience of the end user is similar to a hang.
    

Local fix

  • Apply the ifix
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of WebSphere MQ clients in extremely rare error scenarios
    during initial handshaking.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    The server-side channel program code executing in this scenario
    did not check a return code from a failing internal function.
    But that return code should have been checked.
    

Problem conclusion

  • The WebSphere MQ product code has been corrected so that it
    checks the internal return code, and takes appropriate action
    if it indicates failure.
    
    The same code fix was made earlier on z/OS under APAR PM79595.
    This is therefore a port of that fix, but the symptoms in this
    APAR are a separate and different symptom from that seen on
    z/OS.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.1
    Platform           Fix Pack 7.1.0.4
    --------           --------------------
    Windows            7.1.0.4
    AIX                7.1.0.4
    HP-UX (Itanium)    7.1.0.4
    Solaris (SPARC)    7.1.0.4
    Solaris (x86-64)   7.1.0.4
    iSeries            7.1.0.4
    Linux (x86)        7.1.0.4
    Linux (x86-64)     7.1.0.4
    Linux (zSeries)    7.1.0.4
    Linux (Power)      7.1.0.4
    
    Platform           v7.5
    --------           --------------------
    Multiplatforms     7.5.0.3
    
    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

    IV43442

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-31

  • Closed date

    2013-06-03

  • Last modified date

    2013-06-03

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R710 PSY

       UP

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Document Information

Modified date:
03 June 2013