IJ08120: JAVA JIT CRASHES WITH VMSTATE=0X0005FF0A

APAR status

• Closed as program error.

Error description

• Error Message: Java JIT crashes with vmState=0x0005ff0a in Java
  8 SR5
  .
  Stack Trace: J9::Z::UnresolvedDataSnippet::emitSnippetBody()
  J9::Snippet::emitSnippet()
  OMR::CodeGenerator::emitSnippets()
  OMR::CodeGenPhase::performEmitSnippetsPhase(TR::CodeGenerator*,T
  R::CodeGenPhase*)
  OMR::CodeGenPhase::performAll()
  OMR::CodeGenerator::generateCode()
  OMR::Compilation::compile()
  TR::CompilationInfoPerThreadBase::compile(J9VMThread*,TR::Compil
  ation*,TR_ResolvedMethod*,T...
  TR::CompilationInfoPerThreadBase::wrappedCompile(J9PortLibrary*,
  void*)
  omrsig_protect
  TR::CompilationInfoPerThreadBase::compile(J9VMThread*,TR_MethodT
  oBeCompiled*,J9::J9SegmentP...
  TR::CompilationInfoPerThread::processEntry(TR_MethodToBeCompiled
  &,J9::J9SegmentProvider&)
  TR::CompilationInfoPerThread::processEntries()
  protectedCompilationThreadProc(J9PortLibrary*,TR::CompilationInf
  oPerThread*)
  omrsig_protect
  compilationThreadProc(void*)
  thread_wrapper
  CEEVROND
  .
  

Local fix

Problem summary

• The problem is caused by a codegen level optimization where the
  JIT codegen tries to simplify memory load-and-store. This
  optimization is not designed to work in case the loaded memory
  content is an unresolved Java object field. Doing so leads to
  JIT segmentation faults.
  

Problem conclusion

• The JIT compiler has been updated to prevent the crash from
  occurring when simplifying load-and-store operations on the
  z/Architecture in Java8 SR5.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP20  (8.0.5.20)
  .
  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:

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels