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PH04226: QMGR SENT AN UNEXPECTED MESSAGE TO CLIENT WHEN THE WAIT INTERVALFOR A BROWSE FIRST EXPIRES, RESULTS IN CONNECTION DISCONNECT

A fix is available

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APAR status

  • Closed as program error.

Error description

  • An unexpected message being sent to the client when the wait
    interval for a browse first expires at the same time as a
    matching message arrives on the queue. Client tried to copy the
    message, and if it doesn't fit to application buffer, then
    ArrayIndexOutofBounds Exception occurs. It causes client
    connection to disconnect and CSQX209E is seen on CHINIT JOBLOG.
    .
    Additional Symptom(s) Search Keyword(s):
    MQJE001 2009 MQRC_CONNECTION_BROKEN
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Errors occur in client applications     *
    *                      using MQGMO_BROWSE_FIRST and MQGMO_WAIT *
    *                      if messages arrive as the wait interval *
    *                      expires.                                *
    *                      MQ Java clients encounter an            *
    *                      ArrayIndexOutofBounds exception,        *
    *                      causing the channel to terminate.       *
    *                      MQ C clients can return a message other *
    *                      than the first on the queue.            *
    ****************************************************************
    An MQ client issues a request for messages, causing the channel
    initiator to establish a callback to wait for messages.
    When the WaitInterval expires, the client issues another request
    for a message, requesting a notification when it has been sent.
    
    If multiple messages arrive as this notification is sent, a
    serialisation error in updating the browse state of the consumer
    can result in both the consumer thread and the receive thread
    sending a message to the client between the 2nd message request
    and the notification.
    This is not expected by the client, leading to incorrect
    behaviour with symptoms that vary depending on the client
    implementation.
    

Problem conclusion

  • The serialisation error relating to the browse state of the
    consumer is corrected, preventing the 2nd message being sent
    under these circumstances.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH04226

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-10-18

  • Closed date

    2018-11-15

  • Last modified date

    2019-01-02

  • APAR is sysrouted FROM one or more of the following:

    PH03767

  • APAR is sysrouted TO one or more of the following:

    UI59739 UI59740

Modules/Macros

  • CMQXRSTF
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI59739

       UP18/12/14 P F812

  • R100 PSY UI59740

       UP18/12/15 P F812

Fix is available

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Document Information

Modified date:
02 January 2019