IV86618: UNEXPECTED NULLPOINTEREXCEPTION OR SEGMENTATION ERROR

APAR status

• Closed as program error.

Error description

• Error Message: An unexpected java/lang/NullPointerException or a
  segmentation error is raised by JIT compiled code in the JVM
  .
  Stack Trace: N/A
  .
  This problem can only happen on z Systems on EC12 or later
  hardware
  

Local fix

• This problem can be avoided by using the following Java option:
  -Xjit:disableZHelix
  This option disables the generation of instructions added in
  zEC12 hardware, thus it can potentially cause some performance
  degradation
  

Problem summary

• When generating compiled code for an implicit null check, the
  JIT compiler can potentially do an extra de-reference before an
  LLGFAT instruction. If this happens, then one of two things are
  possible. The LLGFAT instruction will always trap meaning it
  will always throw a NullPointerException, or garbage will be
  loaded into a register which will very likely cause a
  segmentation error shortly afterwards.
  

Problem conclusion

• The JIT compiler has been updated to prevent an erroneous extra
  de-reference before an LLGFAT instruction.
  .
  This APAR will be fixed in the following Java Releases:
   7 SR10 (7.0.10.0)
   7 R1 SR4 (7.1.4.0)
   6 R1 SR10 (6.1.10.0)
   8 SR3 FP10 (8.0.3.10)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R260 PSY

     UP

• R130 PSY

     UP