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IV30270: JIT CRASH CAUSED BY Z/OS V1R11 C COMPILER LIMITATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: On z/OS, the Java JIT compiler crashes in global
value propagation during the compilation of a method.
.
Stack Trace:
TR_J9VM::getBaseComponentClass(TR_OpaqueClassBlock*,int&)+0x3a
TR_J9VMBase::getClassSignature(TR_OpaqueClassBlock*,int&,TR_Memo
ry*)+0x2e
TR_VPFixedClass::create(TR_ValuePropagation*,TR_OpaqueClassBlock
*)+0x114
constrainIfcmpeqne(TR_ValuePropagation*,TR_Node*,bool)+0x257e
constrainIfcmpne(TR_ValuePropagation*,TR_Node*)+0xc
TR_ValuePropagation::processTrees(TR_TreeTop*,TR_TreeTop*)+0x410
TR_GlobalValuePropagation::processBlock(TR_StructureSubGraphNode
*,bool,bool)+0x438
TR_GlobalValuePropagation::processRegionNode(TR_StructureSubGrap
hNode*,bool,bool)+0x662
TR_GlobalValuePropagation::processRegionNode(TR_StructureSubGrap
hNode*,bool,bool)+0x7e
TR_GlobalValuePropagation::processRegionSubgraph(TR_StructureSub
GraphNode*,bool,bool,bool)+0x240
TR_GlobalValuePropagation::perform()+0x498
TR_OptimizerImpl::performOptimization(TR_OptimizerImpl::Optimiza
tion*,int,int,int)+0x1d90
TR_OptimizerImpl::performOptimization(TR_OptimizerImpl::Optimiza
tion*,int,int,int)+0x994
TR_OptimizerImpl::optimize()+0x2f4
TR_Compilation::compile()+0xd52
.

Local fix

  • This problem can be avoided by setting the JVM option
-Xjit:disableGlobalVP. However, this will cause significant
performance degradation.

Problem summary

  • The incorrect behaviour of the JIT compiler results from a
limitation in the z/OS V1R11 C compiler, which was used to build
the JVM.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR3
6.0.1 SR4
.
The JIT compiler source code has been modified to avoid the
issue.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV30270
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2012-10-15
    • 

  • Closed date
    2012-10-15
    • 

  • Last modified date
    2012-10-15
    • 





    

  • 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:
            

            15 October 2012
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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