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IV35868: GC ASSERT IN PARALLEL SCAVENGER

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APAR status

  • Closed as program error.

Error description

  • Error Message: 07:31:54.463 0x826ac00    j9mm.479    *   **
ASSERTION FAILED ** at ParallelScavenger.cpp:2397:
((MM_StackSlotValidator(MM_StackSlotValidator::NOT_ON_HEAP,
*slotPtr, stackLocation, walkState).validate(_env)))
.
Stack Trace: N/A
.
JVM crashes with GC assert.

Local fix

  • 



Problem summary


    

  • The problem was with the merged HCR guard with profiled guards.
Local and global register assignment were adding inconsistencies
that caused the two merged paths to have inconsistent register
state.

    



Problem conclusion


    

  • This defect will be fixed in:
7.0.0 SR4
.
Fixed by introducing internal control flow around the two
branches and setting the dependency on the end label.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV35868
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-01-24
    • 

  • Closed date
    2013-01-24
    • 

  • Last modified date
    2013-01-24
    • 





    

  • 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


    

  • R260  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            24 January 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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