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IV37637: JAVA CRASHES IN GC FOR COMPILED CODE

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APAR status

  • Closed as program error.

Error description

  • Error Message: A GC assertion failure is observed (mainly on
zEC12 z/OS machines) due to a bad object slot:
j9mm.479    *   ** ASSERTION FAILED ** at
./ParallelScavenger.cpp:2397:
((MM_StackSlotValidator(MM_StackSlotValidator::NOT_ON_HEAP,
*slotPtr, stackLocation, walkState).validate(_env)))
.
Stack Trace:
.

Local fix

  • This can be worked around by running Java with the
-Xjit:disableTailRecursion option. This may incur a performance
degradation.

Problem summary

  • The problem is caused by an error in tail recursion
optimization. The problem seems to be reproducible on zEC12
machines running z/OS only, although in theory it affects all
JVMs on all platforms.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR4
6.0.1 SR5
6.0.0 SR14
5.0.0 SR16 FP3
.
The JIT compiler has been updated with the fix for this
optimization.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV37637
    • 

  • Reported component name
    JAVA 5 JIT
    • 

  • Reported component ID
    620500124
    • 

  • Reported release
    500
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-03-05
    • 

  • Closed date
    2013-03-05
    • 

  • Last modified date
    2013-03-05
    • 





    

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

    
IV37636
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    JAVA 5 JIT
    • 

  • Fixed component ID
    620500124
    • 



Applicable component levels


    

  • R500  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            05 March 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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