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IV12484: POSSIBLE CRASH IN JITTED CODE WITH A HOT LOOP

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: Unhandled exception
Type=Segmentation error vmState=0x00000000
J9Generic_Signal_Number=00000004 Signal_Number=0000000b
Error_Value=00000000 Signal_Code=00000001
.
Stack Trace:
.

Local fix

  • This issue is exposed by the loop versioner optimization and it
can be worked around using the -Xjit:disableLoopVersioner
option. That may cause slight performance degradation.

Problem summary

  • This issue may happen only if a hot loop is inlined in a
try-catch block. In some cases, this leads to a NULL pointer
access in the jitted code.

Problem conclusion

  • This defect will be fixed in:
6.0.0 SR10
5.0.0 SR13
6.0.1 SR2
7.0.0 SR1
.
The JIT optimizer has been fixed to avoid the NULL pointer
access in the jitted code.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV12484
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    600
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-12-22
    • 

  • Closed date
    2011-12-22
    • 

  • Last modified date
    2011-12-22
    • 





    

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

    • 

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

    
IV12485
    

    • 



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:
            

            22 December 2011
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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