IV44117: JIT CRASHES WITH VMSTATE=0X0005FF0C ON ZEC12 WITH -XAGGRESSIVE

APAR status

• Closed as program error.

Error description

• Error Message: A segmentation fault is raised in libj9jit26.so;
  the reported VM state is vmState=0x0005ff0c.
  This problem only occurs on a zEC12 with -Xaggressive enabled.
  .
  Stack Trace: #11 in
  generateS390LabelInstruction(TR_CodeGenerator*, TR_S390OpCodes,
  TR_Node*, TR_LabelSymbol*, TR_Instruction*)
  #12 in TR_S390PrivateLinkage::createEpilogue(TR_Instruction*)
  #13 in TR_S390CodeGenerator::doCodeGeneration()
  #14 in TR_CodeGenerator::generateCode()
  #15 in TR_Compilation::generateCode()
  #16 in TR_Compilation::compile()
  .
  

Local fix

• Removing the -Xaggressive option works around the problem.
  

Problem summary

• The crash is caused by a timing issue with branch preload
  optimization in the JIT compiler.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR5
  .
  The JIT compiler has been updated with the fix to branch preload
  optimization.
  

Temporary fix

Comments

APAR Information

• 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

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