IZ73769: JAVA JIT ON PPC - PASSING INCORRECT RETURN ADDRESS TO INTERPRETE R

APAR status

• Closed as program error.

Error description

• Error Message: SIGSEGV with the $IAR and $LR set to NULL. The
  $CTR is pointing to jitExitInterpreter0().
  .
  Stack Trace: N/A
  .
  The problem results in an random value (but NULL is the most
  likely) in the $IAR, $LR and $R0. All three registers will
  contain the same value if this problem is encountered. The $CTR
  will mostly likely contain a pointer to jitExitInterpreter#().
  No accurate stack trace will be provided by any tools (dbx, kca,
  javacore, etc.) for the crashing thread.
  

Local fix

• The problem can be avoided by disabling one JIT optimization
  using the following java command line argument:
  -Xjit:disableInvariantArgumentPreexistence
  Using this option will cause a 1-5% performance regression
  depending on properties of the application that is running.
  

Problem summary

• The JIT would pass an incorrect return address when invoking the
  Interpreter to execute a Java method that contains at least one
  long argument. The problem only occurs when a very rare and
  complex set of runtime conditions exist.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR9
  5.0.0 SR12
  .
  The JIT was modified so that this problem will no longer occur.
  .
  To obtain the fix:
  Install build 20100410 or later
  

Temporary fix

Comments

APAR Information

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

  IZ73768

• 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 PSN

     UP