IV86165: JIT OPTIMIZATION PRODUCES INCORRECT RETURN TYPE CAUSING A CRASH

APAR status

• Closed as program error.

Error description

• Error Message: A crash is observed.
  .
  Stack Trace: This crash is not limited to a particular method.
  So stack trace may vary.
  .
  This issue could be observed on X86, Power, or Z. This is a
  fairly rare case.
  

Local fix

• Normally using the -Xjit:exclude of the top crashing method(s)
  could stop the crash from happening.
  

Problem summary

• JIT could mark the return type of a method to be void when it
  thinks the method will not return like in the case that the
  method always throws an exception. However, this becomes an
  issue, if the same method is recompiled a second time with a
  valid return type. VM will incorrectly use the void return type
  from the first compilation in the second compilation, causing a
  crash.
  

Problem conclusion

• JIT has been fixed to have the correct return type.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR3 FP10  (8.0.3.10)
     6    SR16 FP30 (6.0.16.30)
     6 R1 SR8 FP30  (6.1.8.30)
     7 R1 SR3 FP50  (7.1.3.50)
  .
  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

     UP

• R600 PSY

     UP

• R260 PSY

     UP