IBM Support

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

Fixes are available

DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows

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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
    • 








      
              
                            

              

              [{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.7"}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            18 September 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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