IJ15687: EXCEPTION IS NOT THROWN WHEN USING -XJIT:ENABLEGPU

APAR status

• Closed as program error.

Error description

• Error Message: j> 03:52:20 java.lang.AssertionError:
  java.lang.ArithmeticException didn't throw
  j> 03:52:20     at org.junit.Assert.fail(Assert.java:91)
  j> 03:52:20     at org.junit.Assert.assertTrue(Assert.java:43)
  j> 03:52:20     at
  com.ibm.j9.jitgpu.exceptions.ZeroDivideByZeroTest.exceptionOutsi
  de(ZeroDivideByZeroTest.java:70)
  .
  Stack Trace: N/A
  .
  Failing test was run using the "enableGPU" Xjit option.
  

Local fix

• Do not use the "-Xjit:enableGPU" option. This will prevent Java
  from offloading code to the GPU.
  

Problem summary

• The "-Xjit:enableGPU" option allows the JIT to generate code
  that lets some of the Java application code run on the GPU. When
  Java code being run on the GPU runs into an exception an
  internal flag is set to keep track of the exception. The memory
  being used to hold the flag is sometimes erroneously freed and
  reused too soon which causes the application code to lose track
  of the exception. This results in continuing down a code path
  based on the incorrect belief that an exception did not happen
  which in turn will lead to unpredictable results.
  

Problem conclusion

• Memory management was fixed. The internal flag keeping track of
  Java exceptions thrown while running code on the GPU is no
  longer freed too early.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP35  (8.0.5.35)
  .
  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