IV57317: ILLEGAL INSTRUCTION EXCEPTION IN COMPILED JAVA METHOD

APAR status

• Closed as program error.

Error description

• Error Message: An illegal instruction exception is raised in an
  AOT-compiled method.
  .
  Stack Trace: N/A
  .
  This issue affects both z/OS and z/Linux when a Java program is
  run with an agent that performs bytecode instrumentation and
  class sharing is enabled (with the -Xshareclasses option).
  

Local fix

• This problem can be avoided by disabling class sharing, by
  removing the JVMTI agent, or by setting the JVM option
  -Xaot:exclude={full method name},loadExclude={full method name}
  for the method that is causing the issue. Disabling class
  sharing may cause some performance degradation.
  

Problem summary

• The problem is caused by missing revocations in the AOT-compiled
  method for cases when method execution needs to revert back to
  interpretation.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     7 R1 SR1       (7.1.1.0)
     7    SR7       (7.0.7.0)
     6 R1 SR8       (6.1.8.0)
     6    SR16      (6.0.16.0)
  .
  The JIT compiler has been updated to handle such cases properly.
  

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

     UP

• R260 PSY

     UP

• R600 PSY

     UP