IV77915: JIT MODULE CRASHES ON LINUX ON Z DURING COMPILATION

APAR status

• Closed as program error.

Error description

• Error Message: Unhandled exception
  Type=Segmentation error vmState=0x0005ff09
  Module=libj9jit29.so
  Method being
  compiled=java/lang/ClassLoader.defineClass(Ljava/lang/String;<OS
  B>BIILjava/security/ProtectionDomain;)Ljava/lang/Class;
  .
  Stack Trace: TR_S390RegisterDependencyGroup::assignRegisters ()
  TR_S390LabelInstruction::assignRegistersAndDependencies ()
  IBM::Z::InstructionExt::assignRegisters ()
  IBM::Z::CodeGenerator::doRegisterAssignment ()
  TR_S390OutOfLineCodeSection::assignRegisters ()
  TR_S390BranchInstruction::assignRegistersAndDependencies ()
  IBM::Z::InstructionExt::assignRegisters ()
  IBM::Z::CodeGenerator::doRegisterAssignment ()
  OMR::CodeGenPhase::performRegisterAssigningPhase ()
  .
  This problem can only occur on z Systems.
  

Local fix

Problem summary

• The problem is with the generated code for the 'checkcast' java
  bytecode. The JIT module can raise a SIGSEGV when register
  pressure enforces register spilling when generating code for the
  'checkcast' bytecode.
  

Problem conclusion

• The JIT code has been updated to prevent the segmentation error
  from occurring when generating code associated with the
  'checkcast' bytecode regardless of the state of registers.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR2 (8.0.2.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
   https://www.ibm.com/developerworks/java/jdk/
  

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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

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