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IV43921: 64-BIT JIT-COMPILED CODE LEADS TO INCORRECT INSTANCEOF RESULT OR CRASH

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APAR status

  • Closed as program error.

Error description

  • Error Message: An array store might cause the JVM to crash, or
the instanceof operator might return a wrong result. This only
happens in a JIT-compiled method on 64-bit z/OS or z/Linux.
.
Stack Trace: N/A
.

Local fix

  • This problem can be avoided by setting the JVM option
-Xjit:exclude={full method name} for the method that is causing
the issue. This might cause some performance degradation.

Problem summary

  • The problem is caused by an incorrect type check instruction
sequence in JIT-compiled code.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR5
6.0.1 SR6
6.0.0 SR14
5.0.0 SR16 FP3
.
The JIT compiler has been updated to generate correct code for
type checks.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV43921
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-06-07
    • 

  • Closed date
    2013-06-17
    • 

  • Last modified date
    2013-06-17
    • 





    

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

    • 

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

    
IV43922
    

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R260  PSY
       UP
    • 

  • R600  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            17 June 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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