IJ53989: ASSERT IN THE JIT COMPILER, BADILOP

APAR status

• Closed as program error.

Error description

• Error Message: The JVM stops unexpectedly and an assertion
  message is written to stderr:
  Assertion failed at
  /tmp/bld_83587/bld_linux_x86-64_cmprssptrs/compiler/../omr/compi
  ler/codegen/OMRTreeEvaluator.cpp:590: false
  VMState: 0x0005ff04
  badILOp BadILOp cannot be evaluated
  .
  Stack Trace: The stack trace is not particularly helpful, but
  the javacore will show that the current thread is one of the JIT
  Compilation Threads.
  .
  

Local fix

• The javacore will indicate the method that was being compiled
  when the failure occurred. The line starts with
  1XHEXCPMODULE  Compiling method:
  The problematic method can be excluded from compilation by the
  JIT compiler with a JVM command line option of the following
  form, substituting the actual package, class and method name of
  the failing method:
  -Xjit:exclude={a/b/c/SomeClass.someMethod(*},dontInline={a/b/c/S
  omeClass.someMethod(*}
  If there is already an Xjit option being used then either
  combine the above with the existing option or add
  -XX:+MergeCompilerOptions
  to have the JVM support multiple Xjit options.
  

Problem summary

• Under rare cases the compiler incorrectly handles a passthrough
  node resulting in a BadILOp being placed in the IL. When codegen
  attempts to process this the JVM stops with an assert.
  The potential for the problem appears to be long standing but a
  change in FP35 made occurrence more likely.
  

Problem conclusion

• The JIT has been changed to correctly handle the scenario
  leading to this failure.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
  IBM SDK, Java Technology Edition
     8    SR8 FP45  (8.0.8.45)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
    - IBM Semeru Runtimes, Version 11 and later
      https://www.ibm.com/semeru-runtimes/downloads/
    - IBM SDK, Java Technology Edition, Version 8
      https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
    - Java SDK Products on z/OS
      https://www.ibm.com/support/pages/java-sdk-products-zos
  

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