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IV20173: FIELDS APPEAR TO BE INCOMPLETELY INITIALIZED IN OBJECT CREATED B Y ANOTHER THREAD

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.

Local fix

  • -Xjit:disableAllocationSinking

Problem summary

  • An optimization called allocation sinking moves object
allocations downward in the code.  On PPC is can also sink the
corresponding memory flush instruction.  However, there was a
subtle bug in the opt which could cause it to sink an unrelated
flush.  That means an unrelated allocation can have its flush
delayed, opening up a small window where another thread could
see the allocated object in an uninitialized state.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR2
6.0.1 SR3
.
The opt was fixed so it only sinks the correct flush.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV20173
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2012-04-24
    • 

  • Closed date
    2012-05-04
    • 

  • Last modified date
    2012-09-06
    • 





    

  • 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
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R260  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            06 September 2012
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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