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IZ87984: JAVA6 JIT: STORESINKING OPTIMIZATION CAUSES A CRASH IN JIT COMPI LED CODE

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.
This problem is only seen in the Java6 JIT and the most likely
symptom will be a crash in JIT compiled code. There is no easy
way to determine if you are experiencing this rare issue other
than to analyze the JIT generated assembler code.

Local fix

  • This issue can be worked around using the
-Xjit:disableStoreSinking.  However this may cause the program
to run a few percent slower than before.

Problem summary

  • The problem is caused when a store is incorrectly moved by the
JIT compilers store sinking optimization.

Problem conclusion

  • This defect will be fixed in:
6.0.0 SR9 FP2
.
The JIT has been modified to prevent this type of problem from
occuring.
.
To obtain the fix:
Install build 20101118 or later

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ87984
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    600
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2010-11-04
    • 

  • Closed date
    2010-11-30
    • 

  • Last modified date
    2011-07-09
    • 





    

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

    • 

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

    
PM49962
    

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R600  PSN
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            09 July 2011
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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