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IZ72639: JAVA JIT CRASH ON WINDOWS WHILE USING -XRS OPTION

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV/GPF is received when a JIT-compiled
Java method throws a NullPointerException, and the JVM is
running with the -Xrs option set. The problem only occurs on
Windows.
.
Stack Trace: N/A
.

Local fix

  • The issue can be avoided by not using the -Xrs option, or by
setting the environment variable TR_DisableEBPasGPR=1 prior to
invoking the JVM.

Problem summary

  • The -Xrs option forces the JVM into "reduced signal" mode, which
prevents the Java just-in-time compiler (JIT) from optimizing
null checks. On Windows, this means that one of the hardware
registers in the CPU must be reserved for a null check, but the
JIT compiler was not correctly reserving this register.

Problem conclusion

  • This defect will be fixed in:
6.0.0 SR8
5.0.0 SR12
.
The JIT compiler has been updated to prevent the crash from
occurring during a null check.
.
To obtain the fix:
Install build 20100323 or later

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ72639
    • 

  • 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
    2010-03-17
    • 

  • Closed date
    2010-04-16
    • 

  • Last modified date
    2010-07-22
    • 





    

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

    
IZ72629
    

    • 

  • 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  PSN
       UP
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"5.0","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            22 July 2010
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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