IV90998: JAVA JIT: CRASH IN JAVALOOKUPMETHODIMPL

APAR status

• Closed as program error.

Error description

• Error Message: A SIGSEGV/GPF when running the IBM JVM version
  8.0
  .
  Stack Trace: {libj9vm28.so}{javaLookupMethodImpl}
   {libj9vm28.so}{resolveSpecialMethodRefInto
   {libj9jit28.so}{jitResolveSpecialMethodRef}
   {libj9jit28.so}{getResolvedSpecialMethod__19TR_ResolvedJ9Method
  FP14TR_CompilationiPb}
   {libj9jit28.so}{realEstimateCodeSize__21TR_J9EstimateCodeSizeFP
  13TR_CallTargetP12TR_CallStackb}
   {libj9jit28.so}{estimateCodeSize__21TR_J9EstimateCodeSizeFP13TR
  _CallTargetP12TR_CallStackb}
   {libj9jit28.so}{calculateCodeSize__19TR_EstimateCodeSizeFP13TR_
  CallTargetP12TR_CallStackb}
   {libj9jit28.so}{applyPolicyToTargets__14TR_InlinerBaseFP12TR_Ca
  llStackP11TR_CallSite}
   {libj9jit28.so}{getSymbolAndFindInlineTargets__14TR_InlinerBase
  FP12TR_CallStackP11TR_CallSiteb}
   ...
  The top methods may very slightly but realEstimateCodeSize(),
  and ether getResolvedSpecialMethod() or
  getResolvedStaticMethod() must be on the stack
  .
  The problem can only occur on Java8, but it can occur on any
  platform (x86, POWER, zSeries).
  

Local fix

• The problem can only be avoided by preventing the JIT compiler
  from inlining effected methods. Excluding the compilation of the
  method being compiled when the crash occurs for example, or
  disabling inlining entirely (but that would have a significant
  performance penalty).
  -Xjit:disableInlining
  

Problem summary

• The JVM has some special handling for a class constant pool
  entry that is used for both invokespecial and invokestatic
  bytecodes. When the JIT is asking the VM to resolve such
  constant pool entries it must pass a flag to the VM to insure it
  properly handles the constant pool entry. In the case where the
  JIT was inlining methods that are using such constant pool
  entries it failed to use the correct flag causing the JVM to
  fail when resolving the special constant pool entry.
  

Problem conclusion

• The JIT was modified to pass the correct flag during resolving
  special constant pool entries during inlining.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR4       (8.0.4.0)
  .
  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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