IZ69786: VARIOUS CRASHES OR EXCEPTIONS IN APPLICATION

APAR status

• Closed as program error.

Error description

• Error Message: Various types of crashes or exceptions reported
  by the JVM during application runs.
  .
  Stack Trace: N/A
  .
  

Local fix

• -Xjit:disableLookahead will work around the problem. Please not
  however, that disabling this optimization may impact performance
  of the application.
  

Problem summary

• The problem is due to incorrect information generated by the JIT
  compiler about an array field declared in a class. The JIT
  compiler assumes that there is only a constant length allocation
  for this field in the class constructor and ignores other stores
  to this field. This erroneous information is then used by other
  optimizations (like constant propagation to do constant folding
  of the arraylength) and this results in unexpected program
  behavior.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR8
  5.0.0 SR11 FP2
  .
  The JIT compiler has been updated so that such incorrect
  information is not generated for array fields.
  .
  To obtain the fix:
  Install build 20100210 or later
  

Temporary fix

Comments

APAR Information

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

  IZ69785

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

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP