IV71718: JAVA JIT- SIGSEGV OR NULLPOINTEREXCEPTION

APAR status

• Closed as program error.

Error description

• Error Message: SIGSEGV from Java when running with -Xrs. When
  running without -Xrs on a x86 platform the SIGSEGV would be
  interpreted by the JVM as a NullPointerException. Other
  platforms like Power and zSeries would show a SIGSEGV when
  running without -Xrs.
  .
  Stack Trace: N/A
  .
  The problem has only ever been observed with Java 7.1 but we
  believe that the problem is possible in other releases. It could
  be that the problem is less likely to occur in other Java
  releases.
  

Local fix

• -Xjit:disableTreeSimplificationIf the above option does not
  avoid the problem then this APAR does not apply to your
  problem.The use of this option may have a small impact on
  performance but it's unlikely to be more then 1%.
  

Problem summary

• The JIT would set a flag stating that a value is non-negative
  when in fact a negative value is possible.
  

Problem conclusion

• The JIT was modified so that the non-negative flag is cleared
  when the possibility of a negative value exists.
  .
  This APAR will be fixed in the following Java Releases:
     7 R1 SR3       (7.1.3.0)
     6    SR16 FP4  (6.0.16.4)
     7    SR9       (7.0.9.0)
     8    SR1       (8.0.1.0)
     6 R1 SR8 FP4   (6.1.8.4)
  .
  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:

  IV71719

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP

• R600 PSY

     UP

• R260 PSY

     UP