IV80397: SEGMENTATION ERROR ON ACCESSING OBJECT MOVED BY GC

APAR status

• Closed as program error.

Error description

• Error Message:
  A segmentation error raised by the JIT compiler with
  vmState=0x00000000
  .
  Stack Trace: N/A
  .
  This problem is specific to the zSeries code generator and
  therefore can only occur when running on the zOS or zLinux IBM
  JVM.
  

Local fix

• N/A
  

Problem summary

• The problem is caused when, as part of its optimizations, the
  JIT compiler incorrectly removes a bytecode from the compiler's
  intermediate language. While this operation was safe in some
  cases, it was still being performed in cases where it was not
  safe. This can cause a variety of problems, but the only known
  symptom is a segmentation error caused by accessing the stale
  version of an object which has been moved by the Garbage
  Collector.
  

Problem conclusion

• The JIT compiler has been updated to perform additional checks
  to make sure that the bytecode is only removed when it is safe
  to do so.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR2 FP10 (8.0.2.10)
   7 SR9 FP30 (7.0.9.30)
   7 R1 SR3 FP30 (7.1.3.30)
   6 R1 SR8 FP20 (6.1.8.20
  )
  .
  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/
  
  June 10, 2016: Updated Release information to include 6.1.8.20
  

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

• R130 PSY

     UP

• R260 PSY

     UP