IV95402: DAA OPTIMIZATION IS NOT TURNED OFF UNDER -XRS

APAR status

• Closed as program error.

Error description

• Error Message: a 0C7 Data Exception or Decimal Overflow
  generated by a Binary Coded Decimal instruction causes the JVM
  to terminate.
  .
  Stack Trace: N/A
  .
  This problem only affects z Systems running z/OS
  

Local fix

• If the -Xrs Java command line option is used, then the DAA
  optimization also needs to be explicitly turned off using
  -Xjit:disableIntrinsics
  

Problem summary

• The Data Access Acceleration (DAA) optimization requires
  complete JVM signal handling functionality. The -Xrs option
  reduces the JVM's signal handling capabilities. -Xrs should
  implicitly turn off DAA but it was discovered that this was not
  the case. The result is that if -Xrs is used and DAA is invoked,
  then it is possible that a DAA instruction could generate an
  interrupt which the JVM cannot handle under -Xrs and thus the
  interrupt causes the JVM to unexpectedly terminate.
  

Problem conclusion

• The JIT compiler has been updated so that -Xrs does turn off
  DAA.
  .
  This APAR will be fixed in the following Java Releases:
   7 R1 SR4 FP5 (7.1.4.5)
   8 SR4 FP5 (8.0.4.5)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

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