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IV49282: ARRAYINDEXOUTOFBOUNDSEXCEPTION THROWN WHEN VECTOR OBJECT IS MODI FIED

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APAR status

  • Closed as program error.

Error description

  • Error Message: An unexpected ArrayIndexOutOfBoundsException
might be thrown by a Java program that calls Vector.size() both
before and after a modification to the Vector object. The second
call to Vector.size() would appear to return an out-of-date
value, which would lead to the exception later on.
The problem may be more likely to occur if the JVM is running in
hot code replace (HCR) mode, e.g. when bytecode instrumentation
is being done.
.
Stack Trace: N/A
.

Local fix

  • This issue can be avoided with the -Xjit:disableIPA option.

Problem summary

  • The problem is caused by the JIT compiler which attempts to
perform inter-procedural analysis (IPA) on certain method calls
that are ineligible for IPA. The result of the invalid analysis
causes methods (e.g. Vector.size()) to be inlined into their
callers and optimized incorrectly. The problem may be triggered
more easily in HCR mode, because all non-native Java methods are
ineligible for IPA in this mode.

Problem conclusion

  • This defect will be fixed in:
6.0.0 SR15
6.0.1 SR7
7.0.0 SR6
5.0.0 SR16 FP4
.
The JIT compiler has been updated to abort IPA correctly when it
encounters ineligible method calls.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV49282
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    600
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-09-17
    • 

  • Closed date
    2013-09-17
    • 

  • Last modified date
    2013-09-17
    • 





    

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

    • 

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

    
IV49283
    

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R600  PSY
       UP
    • 

  • R260  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            17 September 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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