IBM Support

IT24818: The dmpmqmsg utility hangs with high CPU usage

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

  • If the dmpmqmsg utility is called programmatically with no stdin
    stream and is attempting to write to a file which already
    exists, the utility hangs with high CPU usage, utilising
    resources until the disk becomes filled up.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of IBM MQ running the runmqras utility with "-section
    cluster" or who are using dmpmqmsg utility programmatically.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    If the dmpmqmsg utility attempts to write to a file which
    already exists, it prompts the user to provide their
    confirmation that the existing file may be overwritten.
    
    If there was no stdin stream on which to obtain the user's
    input, then a coding error caused the dmpmqsg utility to enter
    an infinite loop. This loop caused high CPU usage to be
    overserved from the dmpmqmsg utility.
    

Problem conclusion

  • The dmpmqmsg logic for handling an output file that already
    exists has been fixed by ensuring that the failure to read from
    stdin will terminate the program with a "File already exists"
    error.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.10
    v9.0 LTS   9.0.0.5
    
    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

    IT24818

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-04-23

  • Closed date

    2018-06-20

  • Last modified date

    2018-06-20

  • 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

    5724H7251

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

Document Information

Modified date:
20 June 2018