IJ13156: ASSERTION FAILED IN JIT COMPILER

APAR status

• Closed as program error.

Error description

• Error Message: Assertion failed at OMRMemoryReference.cpp:
  Unexpected instruction type for long displacement on VLRL
  .
  Stack Trace: TR_MvsCallStackIterator::TR_MvsCallStackIterator()
  TR_Debug::printStackBacktrace()
  TR::fatal_assertion(const char*,int,const char*,const char*,...)
  OMR::Z::MemoryReference::generateBinaryEncoding()
  TR::S390VSIInstruction::generateBinaryEncoding()
  OMR::Z::CodeGenerator::doBinaryEncoding()
  .
  A SIGSEGV/GPF is also possible in
  OMR::Z::MemoryReference::generateBinaryEncoding()
  This problem only affects IBM Z systems from z13 and onwards.
  This problem was introduced in Java 8 SR5
  This problem can only be encountered when the dataaccess API is
  used
  

Local fix

• This problem can be avoided with the following command line
  option with minimal performance impact.
  -Xjit:disableVectorBCD
  

Problem summary

• The JIT compiler uses vector instructions to accelerate the
  dataaccess API. One instruction it uses is VLRL. However, when
  the size of the memory reference offset needed is greater than
  2K, VLRL cannot be used. Binary encoding lacked a case to handle
  this, putting it in an incorrect state. This is caught by a
  fatal assertion. In some cases the JIT compiler will crash while
  trying to throw the fatal assertion.
  

Problem conclusion

• This problem is addressed by
  https://github.com/eclipse/omr/pull/3531
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP31  (8.0.5.31)
  .
  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

• R130 PSY

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