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IT26058: MQ channel timeout error log message AMQ9271 reports incorrect error number

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APAR status

  • Closed as program error.

Error description

  • MQ reports AMQ9271 message in the error logs when the channel is
    timing out.
    
    AMQ9271: Channel '<CHANNEL_NAME>' timed out.
    
    EXPLANATION:
    A timeout occurred while waiting to receive from the other end
    of
    channel '<CHANNEL_NAME>'. The address of the remote end of the
    connection was 'x.xx.xx.xxx'.
    ACTION:
    The return code from the select() [TIMEOUT] 65 seconds call was
    4
    (X'4').
    
    In the error message under ACTION section MQ reports that return
    code for select() is 4. But for channel timeout the return code
    should be 0.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of MQ queue manager channels over TCP,
    and native MQI client applications (including unmanaged .NET)
    which use TCP communication to a queue manager
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A logic error meant that a cached error code from previous
    select() calls on a TCP socket could be incorrectly considered
    when evaluating the success of a subsequent select() call.
    

Problem conclusion

  • The MQ channel code has been modified to disregard previous
    error return codes when issuing a select() call on a TCP socket.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.14
    v9.0 LTS   9.0.0.7
    
    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

    IT26058

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-08-23

  • Closed date

    2019-01-30

  • Last modified date

    2019-10-28

  • 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 M/P

  • Fixed component ID

    5724H7261

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

Document Information

Modified date:
28 October 2019