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IC77150: ON AIX ONLY, DB2WDOG PROCESS CONSUMES 100% CPU AND STUCK AT SIGNAL HANDLING CODE.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • If there is general performance issues and
    DB2_MEMORY_PROTECT=YES, and you collect db2pd -stacks or db2fodc
    data, this can cause db2wdog process to get stuck at signal
    handling code and to spin on CPU, causing db2 hang.
    
    This issue happens on AIX only.
    
    ps -ef output will also show a lot of defunc db2fmp processes.
    

Local fix

  • As a temporary workaround, disable db2 memory protect registry:
    
    db2set DB2_MEMORY_PROTECT=NO
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users using DB2_MEMORY_PROTECT db2 registry.             *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * ON AIX ONLY, DB2WDOG PROCESS CONSUMES 100% CPU AND STUCK AT  *
    * SIGNAL HANDLING CODE.                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply DB2 V97 FP5                                            *
    ****************************************************************
    

Problem conclusion

  • First Fixed in DB2 V9.7 Fix Pack 5
    

Temporary fix

  • As a temporary workaround, disable db2 memory protect registry:
     db2set DB2_MEMORY_PROTECT=NO
    

Comments

APAR Information

  • APAR number

    IC77150

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-06-28

  • Closed date

    2011-12-19

  • Last modified date

    2011-12-19

  • 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

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSY

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC77150

Modified date: 19 December 2011