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IZ61357: INTERMITTENT JAVA CRASH IN COMPILED CODE WITH HEAVY WORKLOAD DUE TO UNINITIALIZED STACK SLOT

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: A GPF/SIGSEGV is received when a compiled Java
method is executed that contains loops (or calls to methods
containing loops). The method is likely to be hot (frequently
executed) and heavily optimized. The direct cause of the
crash is an attempt to dereference a pointer that has been
loaded from a stack slot that was not initialized.
.
Stack Trace: N/A
.

Local fix

  • The issue can be avoided with the -Xjit:disableLoopVersioner
option. However, this can cause significant (2% to 10%) impact
on performance.

Problem summary

  • The JIT compiler contained a loop optimization bug which could
lose variable updates in a loop in the generated code.

Problem conclusion

  • This defect will be fixed in:
5.0.0 SR11
.
The JIT compiler has been modified to correct the problem.
.
To obtain the fix:
Install build 20090928 or later

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ61357
    • 

  • 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
    2009-09-24
    • 

  • Closed date
    2009-12-16
    • 

  • Last modified date
    2009-12-16
    • 





    

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

    • 

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

    
IZ61639
    

    • 



Fix information


    

  • Fixed component name
    JAVA 5 JIT
    • 

  • Fixed component ID
    620500124
    • 



Applicable component levels


    

  • R500  PSN
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 December 2009
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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