IZ65833: INCORRECT DISTRIBUTION OF LMUL WITH LCONST OVER ISUB/IADD

APAR status

• Closed as program error.

Error description

• Error Message: A GPF/SIGSEGV is raised in compiled Java code
  due to the use of an incorrectly computed long value.
  .
  Stack Trace: N/A
  .
  Besides crashing, the affected application can also fail in
  other ways, e.g. producing incorrect output.
  

Local fix

• This issue can be avoided by excluding the affected Java method
  with the -Xjit:exclude={class.method*} option.
  

Problem summary

• The problem occurs when the compiled code converts a negative
  int value into a long value, and treats the value as if it was
  positive. This is caused by a bug in the JIT compiler which
  initializes certain internal flags to wrong values, leading the
  compiler to assume that the int variable will be positive.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12
  6.0.0 SR7
  .
  The JIT compiler has been updated to correct the problem.
  .
  To obtain the fix:
  Install build 20091127 or later
  

Temporary fix

Comments

APAR Information

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

  IZ65800

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

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R600 PSN

     UP