IV65771: HANG IN COMPILATION THREAD IN ORDERBLOCKS

APAR status

• Closed as program error.

Error description

• Error Message: None
  .
  Stack Trace: TR_OrderBlocks::findBestPath(TR_CFGNode*)() at
  0x20d6bdd0, PPA1 at 0x20d7a760, stack at
  0x48bc8fb720TR_OrderBlocks::generateNewOrder(List<TR_CFGNode>&)(
  ) at 0x20d72a10, PPA1 at 0x20d7b088, stack at
  0x48bc8fb820TR_OrderBlocks::doReordering()() at 0x20d74b10, PPA1
  at 0x20d7b180, stack at 0x48bc8fb9e0TR_OrderBlocks::perform()()
  at 0x20d75268, PPA1 at 0x20d7b218, stack at
  0x48bc8fbae0TR_OptimizerImpl::performOptimization(TR_OptimizerIm
  pl::Optimization*,int,int,int)() at 0x208039b8, PPA1 at
  0x20813800, stack at
  0x48bc8fbc20TR_OptimizerImpl::performOptimization(TR_OptimizerIm
  pl::Optimization*,int,int,int)() at 0x208039b8, PPA1 at
  0x20813800, stack at 0x48bc8fbde0TR_OptimizerImpl::optimize()()
  at 0x20802bd0, PPA1 at 0x20813770, stack at
  0x48bc8fbfa0TR_Compilation::performOptimizations()() at
  0x206951a8, PPA1 at 0x206b0bf8, stack at
  0x48bc8fc520TR_Compilation::compile()() at 0x206938f8, PPA1 at
  0x206b09d0, stack at
  0x48bc8fc620TR_CompilationInfoPerThreadBase::compile(J9VMThread*
  ,TR_Compilation*,TR_Options*,TR_Resolve...() at 0x2027e140, PPA1
  at 0x2028a368, stack at
  0x48bc8fc7a0TR_CompilationInfoPerThreadBase::wrappedCompile(J9Po
  rtLibrary*,CompileParameters*)() at 0x20278f28, PPA1 at
  0x20289e48, stack at 0x48bc8fcf60
  .
  

Local fix

• -Xjit:disableInliningOfNatives
  

Problem summary

• The method inlining optimization left a jit data structure in an
  inconsistent state, having marked a code block as being
  reachable from only one predecessor block when it is actually
  reachable from multiple blocks.  This inconsistency caused
  OrderBlocks to enter an infinite loop.
  

Problem conclusion

• The inliner has been fixed to not to produce the inconsistent
  state.
  .
  This APAR will be fixed in the following Java Releases:
     7 R1 SR2       (7.1.2.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, Java maintenance is available
  from:
             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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