IV92360: BYTE ARRAY COPY TERMINATES UNEXPECTEDLY

APAR status

• Closed as program error.

Error description

• Error Message: The copying of one byte array to another
  unexpectedly terminates when 0xFF is read from the source array.
  .
  Stack Trace: N/A
  .
  This problem can only happen on z Systems.
  

Local fix

• The problem can be avoided using the following Java option:
  -Xjit:disableIdiomRecognition
  Note that this may impact performance.
  

Problem summary

• As part of the JIT compiler's attempts to optimize loops, it is
  possible that the compiler may not properly recognize a byte
  array copy and mistakenly insert a stopping condition. This
  causes the copy to terminate when the value 0xFF is read from
  the source array when the copying should have continued for the
  entire length of the source array.
  

Problem conclusion

• The JIT compiler has been updated to prevent incorrectly
  inserting a stopping condition into byte array copying loops.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP40  (6.1.8.40)
     8    SR4       (8.0.4.0)
     6    SR16 FP40 (6.0.16.40)
     7 R1 SR4       (7.1.4.0)
     7    SR10      (7.0.10.0)
  .
  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

• R260 PSY

     UP

• R130 PSY

     UP

• R600 PSY

     UP