IJ05810: JIT COMPONENT CRASHES ON Z14 WHEN COMPILING A JAVA FUNCTION WHICH CALLS THE DATAACCESSACCELERATOR API

APAR status

• Closed as program error.

Error description

• Error Message: A JIT segmentation error is received compiling a
  Java method that ends up invoking the DataAccessAccelerator
  (DAA) API on z14 Linux and z/OS.
  .
  Stack Trace: A Linux segmentation fault with the following
  functions on the stack
  OMR::Z::MemoryReference::calcDisplacement(unsigned char*,
  TR::Instruction*, TR::CodeGenerator*) + 100
  OMR::Z::MemoryReference::generateBinaryEncoding(unsigned char*,
  TR::CodeGenerator*, TR::Instruction*) + 314
  OMR::Z::CodeGenerator::doBinaryEncoding() + 1220
  OMR::CodeGenPhase::performBinaryEncodingPhase(TR::CodeGenerator*
  , TR::CodeGenPhase*) + 172
  OMR::CodeGenPhase::performAll() + 224
  OMR::CodeGenerator::generateCode() + 110
  OMR::Compilation::compile() + 9996
  TR::CompilationInfoPerThreadBase::compile(J9VMThread*,
  TR::Compilation*, TR_ResolvedMethod*, TR_J9VMBase&,
  TR_OptimizationPlan*, TR::SegmentAllocator const&) + 2704
  TR::CompilationInfoPerThreadBase::wrappedCompile(J9PortLibrary*,
  void*) + 1674
  omrsig_protect + 892
  TR::CompilationInfoPerThreadBase::compile(J9VMThread*,
  TR_MethodToBeCompiled*, J9::J9SegmentProvider&) + 1172
  TR::CompilationInfoPerThread::processEntry(TR_MethodToBeCompiled
  &, J9::J9SegmentProvider&) + 632
  TR::CompilationInfoPerThread::processEntries() + 790
  TR::CompilationInfoPerThread::run() + 62
  protectedCompilationThreadProc(J9PortLibrary*,
  TR::CompilationInfoPerThread*) + 200
  omrsig_protect + 892
  compilationThreadProc(void*) + 496
  thread_wrapper + 340
  .
  

Local fix

• This issue can be worked around using the -Xjit:disableVectorBCD
  option.
  

Problem summary

• The problem is caused when a Java method calls the DAA API and
  the API method is hardware accelerated using z14 vector packed
  decimal instructions. The JIT compiler crashes when emitting
  such vector instructions.
  

Problem conclusion

• A fix has been made and delivered to the Java JIT to prevent the
  crash from happening when emitting z14 vector packed decimal
  instructions.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP15  (8.0.5.15)
  .
  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