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IV44173: JAVA JIT - HANG INSIDE A LOOP DUE TO A FAILURE TO YIELD FOR A GC CYCLE

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.
N/A

Local fix

  • -Xjit:disableRedundantAsyncCheckRemoval would work around the
functional issue

Problem summary

  • Internal testing has uncovered a functional bug (hang) due to
improper placement of asyncchecks. This leads to a hang when we
wait for a particular thread to yield and it gets stuck inside a
loop (while this bug can happen anywhere with the necessary
bytecode pattern we have only seen it in ForkJoin code) not
being able to yield because there is no asynccheck.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR5
6.0.1 SR6
6.0.0 SR14
5.0.0 SR16
.
The JIT has been updated to eliminate the problem with async
check placement.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV44173
    • 

  • 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
    2013-06-12
    • 

  • Closed date
    2013-06-12
    • 

  • Last modified date
    2013-06-12
    • 





    

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

    
IV44172
    

    • 

  • 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:
            

            12 June 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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