IJ14008: SEGMENTATION FAULT WHILE COMPILING A METHOD

APAR status

• Closed as program error.

Error description

• Error Message: j> 12:18:09 Unhandled exception
  j> 12:18:09 Type=Segmentation error vmState=0x00054fff
  .
  Stack Trace: N/A
  .
  Failing test was run using the
  "enableGPU={enforce<PIPE>verbose}" Xjit option.
  

Local fix

• Two choices for a workaround:
  1. Do not use the "-Xjit:enableGPU={enforce}" option. Just
  "-Xjit:enableGPU" is still okay.
  This may prevent Java from offloading code to the GPU when
  normally it could.
  2. Use "-Xjit:disableAutoSIMD" option.
  This will disable the use of vector instructions to parallelize
  qualified loops.
  

Problem summary

• If the "enableGPU={enforce}" Xjit option is used to enforce the
  use of JIT GPU, it can sometimes confuse the AutoSIMD
  optimization (which is on be default) that tries to
  automatically parallelize loops with vector instructions. This
  happens when both optimizations try to act on the same loop and
  leads to a segmentation fault.
  

Problem conclusion

• The AutoSIMD optimization was updated to understand what the JIT
  GPU optimization did and back off instead of segfaulting.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP30  (8.0.5.30)
  .
  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