IJ11150: AUTOSIMD BADILOP ASSERTION

APAR status

• Closed as program error.

Error description

• Error Message: Shutdown of application, in stderr the following
  was seen:
  Assertion failed: 0, file .../Assert.cpp, line 72
  .
  Stack Trace: {libpthreads.a}{pthread_kill}
  {libpthreads.a}{_p_raise}
  {libc.a}{raise}
  {libc.a}{abort}
  {libc.a}{__assert_c99}
  {libj9jit29.so}{assumeDontCallMeDirectlyImpl__FPCciN21Pcb}
  {libj9jit29.so}{fatal_assertion__2TRFPCciN21e}
  {libj9jit29.so}{badILOpEvaluator__Q2_3OMR13TreeEvaluatorFPQ2_2TR
  4NodePQ2_2TR13CodeGenerator}
  {libj9jit29.so}{evaluate__Q2_3OMR13CodeGeneratorFPQ2_2TR4Node}
  {libj9jit29.so}{doInstructionSelection__Q2_2J913CodeGeneratorFv}
  {libj9jit29.so}{performInstructionSelectionPhase__Q2_3OMR12CodeG
  enPhaseFPQ2_2TR13CodeGeneratorPQ2_2TR12CodeGenPhase}
  {libj9jit29.so}{performAll__Q2_3OMR12CodeGenPhaseFv}
  {libj9jit29.so}{generateCode__Q2_3OMR13CodeGeneratorFv}
  {libj9jit29.so}{compile__Q2_3OMR11CompilationFv}
  {libj9jit29.so}{compile__Q2_2TR28CompilationInfoPerThreadBaseFP1
  0J9VMThreadPQ2_2TR11CompilationP17TR_ResolvedMethodR11TR_J9VMBas
  eP19TR_OptimizationPlanRCQ2_2TR16SegmentAllocator}
  {libj9jit29.so}{wrappedCompile__Q2_2TR28CompilationInfoPerThread
  BaseFP13J9PortLibraryPv}
  {libj9prt29.so}{omrsig_protect}
  {libj9jit29.so}{compile__Q2_2TR28CompilationInfoPerThreadBaseFP1
  0J9VMThreadP21TR_MethodToBeCompiledRQ2_2J917J9SegmentProvider}
  {libj9jit29.so}{processEntry__Q2_2TR24CompilationInfoPerThreadFR
  21TR_MethodToBeCompiledRQ2_2J917J9SegmentProvider}
  {libj9jit29.so}{processEntries__Q2_2TR24CompilationInfoPerThread
  Fv}
  {libj9jit29.so}{run__Q2_2TR24CompilationInfoPerThreadFv}
  {libj9jit29.so}{protectedCompilationThreadProc__FP13J9PortLibrar
  yPQ2_2TR24CompilationInfoPerThread}
  {libj9prt29.so}{omrsig_protect}
  {libj9jit29.so}{compilationThreadProc__FPv}
  {libj9thr29.so}{thread_wrapper}
  {libpthreads.a}{_pthread_body}
  The frame with "badILOpEvaluator()" is the key indicator that
  the problem this APAR describes has occurred.
  .
  This problem can occur on any platform when using the J9 JVM
  

Local fix

• The problem can be avoided by using the following java command
  line option:
  -Xjit:disableAutoSIMD
  A performance impact might be seen if your application is
  written in a way where AutoSIMD finds a lot of optimization
  opportunities, but in most large server side applications the
  effect will be very small.
  

Problem summary

• The problem occurs when a section of code is optimized by
  autoSIMD which should have been marked as invalid for autoSIMD.
  This is due to a failure to correctly check if all criteria for
  autoSIMD are present.
  

Problem conclusion

• The JVM has been updated to perform proper checks before
  autoSIMD optimizations are applied.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR5 FP26 (8.0.5.26)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels