IJ22219: RUNTIME FAILURE IN THE JIT WHEN RUNNING ON Z ARCHITECTURE

APAR status

• Closed as program error.

Error description

• Error Message: The error manifests itself as an
  ArrayIndexOutOfBoundsException
  .
  Stack Trace: The ArrayIndexOutOfBoundsException error was
  reported with the following java backtrace:
  java.lang.ArrayIndexOutOfBoundsException
      at sun.nio.fs.UnixPath.initOffsets(UnixPath.java:255)
      at sun.nio.fs.UnixPath.getParent(UnixPath.java:314)
      at sun.nio.fs.UnixPath.getParent(UnixPath.java:55)
      at
  javasoft.sqe.tests.api.java.nio.file.Path.ConvTests.resolveSibli
  ng_Path_02(ConvTests.java:1863)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
  Method)
      at
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessor
  Impl.java:90)
      at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
  AccessorImpl.java:55)
      at java.lang.reflect.Method.invoke(Method.java:508)
      at
  javasoft.sqe.javatest.lib.MultiTest.invokeTestCase(MultiTest.jav
  a:405)
      at
  javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:194)
      at
  javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:126)
      at
  javasoft.sqe.tests.api.java.nio.file.Path.ConvTests.main(ConvTes
  ts.java:65)
  .
  

Local fix

Problem summary

• This problem is caused due to a JIT bug in register shuffling,
  wherein the register copy is placed incorrectly, prior to the
  current instruction. This is functionally incorrect as registers
  freed as part of a shuffle can be allocated elsewhere and
  subsequently get clobbered as part of the register copy. The
  problem affects all Z systems (zLinux & zOS) and does not effect
  any other CPU architecture.
  

Problem conclusion

• The JIT has been updated to correctly order the register copy as
  well as eliminate the use of GPR0 across instructions that use
  memory references
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP5   (8.0.6.5)
  .
  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