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IZ78654: POTENTIAL FP REGISTER CORRUPTION WITH KDB ENABLED. APPLIES TO AIX 6100-05

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APAR status

  • Closed as program error.

Error description

  • Customers do not enable the kernel debugger, so they should not
be exposed to this problem. If they did, the symptom would be
possible corruption of FR register(s) for application that
generate invalid operation exceptions. That could lead to
incorrect results of calculations by such applications.
The combination of kernel debugger enabled and the application
generating invalid operation exceptions make it extremely
unlikely that a customer application would ever see it.

Local fix

  • 



Problem summary


    

  • Customers do not enable the kernel debugger, so they should not
be exposed to this problem. If they did, the symptom would be
possible corruption of FR register(s) for application that
generate invalid operation exceptions. That could lead to
incorrect results of calculations by such applications.
The combination of kernel debugger enabled and the application
generating invalid operation exceptions make it extremely
unlikely that a customer application would ever see it.

    



Problem conclusion


    

  • Set the vmx_in_use flag in the PVPA when using vsr32 to restore
the FP state in kdb.

    



Temporary fix


    

  • 



Comments


    

  • 6100-04 - use AIX APAR IZ79000
6100-05 - use AIX APAR IZ78654
6100-06 - use AIX APAR IZ77475
6100-06 - use AIX APAR IZ77798
7100-00 - use AIX APAR IZ78165

    



APAR Information




    

  • APAR number
    IZ78654
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2010-07-02
    • 

  • Closed date
    2010-07-02
    • 

  • Last modified date
    2013-03-28
    • 





    

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

    
IZ77475
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U834695
       UP10/08/20  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            28 March 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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