IBM Support

IT24367: IBM MQ V9: The RUNMQSC process is looping intermittently, if thenew feature "RUNMQSC command line editor for Unix" is used.

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APAR status

  • Closed as program error.

Error description

  • With IBM MQ Version 9.0.0 on Linux x86-64, if the new feature
    "runmqsc command line editor for UNIX" is used, the runmqsc
    process may intermittently become unresponsive to commands.
    
    This has been occasionally shown to happen if the network
    connection is broken to a remote terminal runmqsc session.
    
    For more information about this feature, see the IBM Knowledge
    Center topic below:
    https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.0.0/com.
    ibm.mq.pro.doc/q113130_.htm
    

Local fix

  • Disable the command recall, command completion, and Emacs
    command keys by setting the environment variable below:
    
       export MQ_OVERRIDE_LIBEDIT_LOAD=TRUE
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    MQ version 9.0 UNIX users running runmqsc and using the up/down
    arrow or tab keys to recall previous commands or access command
    completion options.
    
    
    Platforms affected:
    Linux on x86-64, Solaris x86-64, Solaris SPARC, Linux on
    zSeries, Linux on Power, HP-UX PA-RISC, HP-UX Itanium, AIX
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    Due to a programming error, the command recall/ command
    completion function could cause the program to enter an infinite
    loop and become unresponsive to key presses.
    If this occurred it would be seen that the runmqsc process is
    consuming 100% CPU cycles.
    

Problem conclusion

  • The programming error has been corrected.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 LTS   9.0.0.6
    v9.1 CD    9.1.2
    v9.1 LTS   9.1.0.1
    
    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

    IT24367

  • 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

    2018-03-16

  • Closed date

    2018-06-15

  • Last modified date

    2018-12-03

  • 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

    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:
03 December 2018