IV13764: CRASH IN THE JIT COMPILER WHILE COMPILING A METHOD

APAR status

• Closed as program error.

Error description

• Error Message: Unhandled exception with a vmstate=0x5ff06
  .
  Stack Trace: TR_SetMonitorStateOnBlockEntry::set
  TR_CodeGenerator::doInstructionSelection
  TR_CodeGenerator::generateCodePhase1???????????
  TR_CodeGenrattor::generateCode
  .
  

Local fix

• N/A. There is no known workaround for the problem at this time
  because the code paths in the compiler need to run and cannot be
  disabled.
  

Problem summary

• The problem is related to the way the compiler propagates
  information about locks within the method being compiled. The
  problem is in turn caused by how older Javac (in particular
  1.3.1) generates exception ranges compared to newer Javac (1.4.2
  and above). The older javacs include 'return' bytecode within
  the exception range for synchronized blocks whereas newer javacs
  exclude 'return' bytecodes from the range. This inclusion causes
  problems for the JIT compiler during the identification of live
  locks in the method.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR11
  6.0.1 SR2
  7.0.0 SR1
  .
  The JIT compiler has been updated to workaround the scenario
  when 'return' bytecodes could be included in exception ranges
  and propagate the information about live locks correctly.
  

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

• R600 PSY

     UP

• R260 PSY

     UP