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


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV30270

Modified date:

2012-10-15

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