PK57567: JAVA 5 JIT PRODUCES INCORRECT OUTPUT WHILE USING JAVA ADVANCED IMAGING API

APAR status

• Closed as program error.

Error description

• Error Message: Java 5 programs using the Java Advanced Imaging
  (JAI) API on x86 platforms could produce corrupted images when
  the JIT compiler is enabled. Specifically, the problem may occur
  consistently when performing bi-cubic interpolation with the
  class com.sun.media.jai.opimage.ScaleBicubicOpImage.
  .
  Stack Trace: N/A
  .
  

Local fix

• The issue can worked around by preventing the JIT compiler from
  optimizing the methods in the problematic class, with the
  following options:
  -Xjit:exclude={com/sun/media/jai/opimage/ScaleBicubicOpImage*}
  Note that this will force the code to be interpreted and can
  slow down the image operation significantly.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: IBM WebSphere Application Server version     *
  *                 6.1 users                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Java 5 JIT produces incorrect output    *
  *                      while using java advanced imaging API   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem is caused when the JIT compiler generates a bad
  native instruction sequence for a multiplication of a 64-bi
  long with an element of a byte array.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR7
  .
  The JIT compiler has been updated to generate correct
  instructions for such operations.
  .
  To obtain the fix:
  Install build 20071027 or later
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ08152

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSPH APP SERV

• Fixed component ID

  5724J0800

Applicable component levels

• R61I PSY

     UP

• R61W PSY

     UP