IBM Support

IT35827: amqcgskv32 triggered by runmqras creates zero-byte FDCs continuously

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • On IBM MQ 9.1 LTS, when collecting diagnostic files the
    runmqras utility executes '/opt/mqm/bin/amqcgskv32 -f 65535 -v '
    which
    loops continuously generating zero-byte FDC files.
    

Local fix

  • Manually kill the amqcgskv32 process to stop the
    creation of multiple zero-byte FDC files.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of runmqras or dspmqver may encounter this issue.  The
    problem specifically occurs on systems with very large file
    inode numbers.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The problem occurred due to a 64-bit inode number being returned
    to a 32-bit stat() call.  This caused EOVERFLOW to be generated
    and the IBM MQ FDC code incorrectly entered an infinite loop.
    

Problem conclusion

  • The code has been corrected so that it uses a version of stat()
    which can cope with a 64-bit inode value.  The code which caused
    the hard loop on EOVERFLOW has also been corrected.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 LTS   9.1.0.10
    v9.2 LTS   9.2.0.4
    v9.x CD    9.2.5
    
    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

    IT35827

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-02-08

  • Closed date

    2021-10-19

  • Last modified date

    2021-11-25

  • 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 MP

  • Fixed component ID

    5724H7271

Applicable component levels

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]

Document Information

Modified date:
26 November 2021