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IV34794: POSSIBLE INCREASE IN RANDOM KPROC CPU USAGE. APPLIES TO AIX 7100-01

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APAR status

  • Closed as program error.

Error description

  • Possible increase in random kproc cpu usage;
A typical case is where one thread opens /dev/random, but never
reads from it. Then another thread opens /dev/random when a
privious thread has already opened the /dev/random device,
causing the increased cpu usage by the random kproc.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:
* Systems running the 7100-01 Technology Levels with the
* bos.rte.security fileset at the 7.1.1.18 level.
****************************************************************
* PROBLEM DESCRIPTION:
* Possible increase in random kproc cpu usage;
* A typical case is where one thread opens /dev/random, but neve
r* reads from it. Then another thread opens /dev/random when a
* privious thread has already opened the /dev/random device,
* causing the increased cpu usage by the random kproc.
****************************************************************
* RECOMMENDATION:
* Install APAR IV34794.
****************************************************************

    



Problem conclusion


    

  • Modified the random device driver' kproc so to handle to case
where a thread may open /dev/random device, but never closes
it.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV34794
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    YesPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2013-01-15
    • 

  • Closed date
    2013-01-15
    • 

  • Last modified date
    2013-11-25
    • 





    

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

    
IV33203
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U854872
       UP13/04/25  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            25 November 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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