IV33529: ILLEGALMONITORSTATEEXCEPTION THROWN BY JIT-COMPILED METHOD

APAR status

• Closed as program error.

Error description

• Error Message: An IllegalMonitorStateException is thrown by a
  Java method that has been re-compiled at higher optimization
  levels. The throwing method likely has been inlined into a loop
  in its caller.
  .
  Stack Trace: N/A
  .
  

Local fix

• This issue can be worked around using the
  -Xjit:disableRedundantMonitorElimination option.
  

Problem summary

• This problem occurs when the inlining of a virtual method is
  disabled for correctness, e.g. after the loading of a new class
  that implements the same method. If the inlined call site is on
  a code path that locks multiple objects, the compensating code
  generated by the JIT compiler incorrectly attempts to unlock the
  same object twice.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR12
  5.0.0 SR16
  6.0.1 SR5
  7.0.0 SR4
  .
  The JIT compiler has been updated to generate correct code for
  the non-inlined virtual method call sequence.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV33528

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSY

     UP