IBM Support

IV74071: CPU USAGE INCREASING DUE TO REGEX LOOPING

Direct links to fixes

7.1.0-TIV-NCI-ZLINUX-FP0006
7.1.0-TIV-NCI-WINDOWS-FP0006
7.1.0-TIV-NCI-SOLARIS-FP0006
7.1.0-TIV-NCI-LINUX-FP0006
7.1.0-TIV-NCI-AIX-FP0006
6.1.1-TIV-BSM-FP0004-windows
6.1.1-TIV-BSM-FP0004-zlinux
6.1.1-TIV-BSM-FP0004-solaris
6.1.1-TIV-BSM-FP0004-linux
6.1.1-TIV-BSM-FP0004-aix
6.1.1-TIV-NCI-FP0004-windows
6.1.1-TIV-NCI-FP0004-zlinux
6.1.1-TIV-NCI-FP0004-solaris
6.1.1-TIV-NCI-FP0004-aix
6.1.1-TIV-NCI-FP0004-linux
7.1.0-TIV-NCI-ZLINUX-FP0005
7.1.0-TIV-NCI-LINUX-FP0005
7.1.0-TIV-NCI-WINDOWS-FP0005
7.1.0-TIV-NCI-SOLARIS-FP0005
7.1.0-TIV-NCI-AIX-FP0005
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 3(7.1.0-TIV-NCI-FP0003)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 4(7.1.0-TIV-NCI-FP0004)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 5(7.1.0-TIV-NCI-FP0005)
IBM Tivoli Netcool/Impact V6.1.1 Fix Pack 4 (6.1.1-TIV-NCI-FP0004)
IBM Tivoli Business Service Manager V6.1.1 Fix Pack 4(6.1.1-TIV-BSM-FP0004)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 6(7.1.0-TIV-NCI-FP0006)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 7(7.1.0-TIV-NCI-FP0007)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 8(7.1.0-TIV-NCI-FP0008)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 9(7.1.0-TIV-NCI-FP0009)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 10(7.1.0-TIV-NCI-FP0010)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 11(7.1.0-TIV-NCI-FP0011)
IBM Tivoli Netcool/Impact V6.1.1 Fix Pack 5 (6.1.1-TIV-NCI-FP0005)
IBM Tivoli Business Service Manager V6.1.1 Fix Pack 5(6.1.1-TIV-BSM-FP0005)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 12 (7.1.0-TIV-NCI-FP0012)
IBM Tivoli Netcool/Impact V7.1.0 Fix Pack 13 (7.1.0-TIV-NCI-FP0013)

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The regular expression gets stuck in an infinite loop trying to
    match  the string. This will increase CPU usage.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All Impact Users                                             *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * The regular expression gets stuck in an infinite loop trying *
    * to                                                           *
    * match  the string. This will increase CPU usage.             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * NONE                                                         *
    ****************************************************************
    When a valid regular expression was run against and invalid
    string, it can cause the policy to run in an infinite loop and
    consume 100% of the CPU.
    

Problem conclusion

  • Added a timeout for when the regex gets stuck in a loop.  The
    default timeout is 10000ms.  This can be changed by adding
    impact.regex.timeout=<time in ms> to the
    <servername>_server.props.
    
    The fix for this APAR is contained in the following maintenance
    packages:
    
    |Fix Pack|6.1.1-TIV-NCI-FP0004
    |Fix Pack|7.1.0-TIV-NCI-FP0003
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV74071

  • Reported component name

    NETCOOL/IMPACT

  • Reported component ID

    5724O59IS

  • Reported release

    611

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-06-10

  • Closed date

    2015-07-02

  • Last modified date

    2016-10-12

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

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

Modules/Macros

  • UNKNOWN
    

Fix information

  • Fixed component name

    NETCOOL/IMPACT

  • Fixed component ID

    5724O59IS

Applicable component levels

  • R611 PSY

       UP

  • R710 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSCP78Y","label":"Netcool\/Impact"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"611","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
12 October 2016