IJ22150: RUNTIME FAILURE IN THE JIT WHEN RUNNING ON Z ARCHITECTURE

APAR status

• Closed as program error.

Error description

• Error Message: The error manifests itself as a JIT assertion
  failure during register allocation, namely, "Attempting register
  copy with source (X) and target (Y) real registers not
  corresponding to any virtual register"
  .
  Stack Trace: The assertion has the following backtrace:
  TR::fatal_assertion(char const*, int, char const*, char const*,
  ...) () from libj9jit29.so
  OMR::Z::Machine::registerCopy(TR::CodeGenerator*,
  TR_RegisterKinds, TR::RealRegister*, TR::RealRegister*,
  TR::Instruction*) () from libj9jit29.so
  OMR::Z::Machine::assignBestRegisterSingle(TR::Register*,
  TR::Instruction*, bool, unsigned long) () from libj9jit29.so
  OMR::Z::Machine::assignBestRegister(TR::Register*,
  TR::Instruction*, bool, unsigned long) () from libj9jit29.so
  TR_S390RegisterDependencyGroup::assignRegisters(TR::Instruction*
  , TR_RegisterKinds, unsigned int, TR::CodeGenerator*) () from
  libj9jit29.so
  OMR::Z::Instruction::assignRegistersAndDependencies(TR_RegisterK
  inds) () from libj9jit29.so
  .
  

Local fix

Problem summary

• This problem is caused when certain JIT compiled methods result
  in instructions that cause virtual register shuffling but do not
  re-assign shuffled registers correctly. The problem occurs on
  zOS and zLinux platforms. The earliest sighting of this problem
  was in Java 8.0.5.41 and the issue appears in SR5+.
  

Problem conclusion

• The JIT has been updated to fix the re-assignment of virtual
  registers
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP5   (8.0.6.5)
  .
  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