IBM Support

IV50589: JAVA JIT OPTIMIZATIONS BASED ON UNINITIALIZED CLASSES CAUSE INCO RRECT PROGRAM BEHAVIOUR

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APAR status

  • Closed as program error.

Error description

  • Error Message: A Java program exhibits unexpected behaviour, or
causes the JVM to crash.
.
Stack Trace: N/A
.
N/A

Local fix

  • -Xjit:disableGlobalVP,disableLocalVP

Problem summary

  • The problem is caused by a JIT compiler optimization known as
value propagation. When a Java method which uses a class that
has been loaded but not yet initialized is compiled, the
optimization transforms its code incorrectly, leading to
incorrect program behaviour.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR6
6.0.1 SR7
6.0.0 SR15
.
The JIT compiler has been updated to ensure that classes are
loaded and initialized before the optimizer uses them in value
propagation.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV50589
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-10-08
    • 

  • Closed date
    2013-10-08
    • 

  • Last modified date
    2013-10-21
    • 





    

  • 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:
            

            21 October 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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