IBM Support

IV60019: HIGH CPU IN AOT/JIT COMPILED METHOD DUE TO LIVELOCK CONDITION

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.
The JVM continues to burn CPU without making progress.

Local fix

  • The issue can happen only when using AOT code (enabled by the
-Xshareclasses command line option) and can be circumvented by
using -Xaot:disableSharedCacheHints

Problem summary

  • When using AOT code (enabled by -Xshareclasses option) the JIT
can encounter a race condition which leads to a perpetual
attempt to schedule a recompilation of an AOT method. The thread
involved is not making any progress while burning 100% of a CPU.

Problem conclusion

  • This APAR will be fixed in the following Java Releases:
   7 R1 SR1 FP1   (7.1.1.1)
.
The JIT compiler has been fixed to eliminate the race condition
leading to the livelock.

Temporary fix

  • -Xaot:disableSharedCacheHints

Comments

  • 



APAR Information




    

  • APAR number
    IV60019
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    130
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2014-05-01
    • 

  • Closed date
    2014-05-12
    • 

  • Last modified date
    2014-07-16
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R130  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 July 2014
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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