IV75420: INCORRECT STRING HASH CODE CALCULATION IN JIT-COMPILED METHOD

PI45300: Ship Java 8 SR1 FP10 for WSAS Liberty profile V855X

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  JIT compiled method String.hashCode() returned incorrect hash
  code for some strings on Power 8 machines. Both AIX and Linux
  are affected.
  

Local fix

• This issue can be worked around using the
  -Xjit:disableSIMDStringHashCode option. Note that this will
  cause some performance degradation.
  

Problem summary

• The problem is caused when JIT's fast-path String.hashCode()
  behave incorrectly on strings containing characters with values
  between 0x8000 and 0xFFFF.
  

Problem conclusion

• The JIT has been updated to prevent the incorrect hash code by
  adding a bit mask to the compiled code.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
  .
  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

• R130 PSY

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