IJ56392: UNEXPECTED BEHAVIOUR FROM JIT COMPILED METHOD

APAR status

• Closed as program error.

Error description

• Error Message: In the only reported case to date, the problem
  surfaced as an unexpected NullPointerException, although it's
  possible that other outcomes could occur, including JVM crashes.
  .
  Stack Trace: In the reported case the NPE was thrown from
  org.springframework.aop.framework.AopProxyUtils.adaptArgumentsIf
  Necessary. It is possible that other methods could be affected.
  .
  

Local fix

• The problem can be avoided by excluding the affected method from
  compilation by the JIT. For example if the problem occurred in
  a.b.c.MyClass.myMethod, the following option could be used:
  -Xjit:exclude={a/b/c/MyClass.myMethod(*},dontInline={a/b/c/MyCla
  ss.myMethod(*}
  Note that if an existing Xjit option is already being used it
  will either need to be combined with the above, or
  -XX:+MergeCompilerOptions must also be set.
  

Problem summary

• In what is currently thought to be a rare circumstance, the JIT
  incorrectly compiles methods which contain more than two
  commoned references to a passthrough node in a block when that
  block needs to be split.
  

Problem conclusion

• The JIT has been modified to handle the case of more than two
  commoned passthrough nodes in a block during splitting via
  https://github.com/eclipse-omr/omr/pull/7958
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     21              21.0.10.0
     17              17.0.18.0
     11              11.0.30.0
  IBM SDK, Java Technology Edition
     8    SR8 FP60  (8.0.8.60)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
    - IBM Semeru Runtimes, Version 11 and later
      https://www.ibm.com/semeru-runtimes/downloads/
    - IBM SDK, Java Technology Edition, Version 8
      https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
    - Java SDK Products on z/OS
      https://www.ibm.com/support/pages/java-sdk-products-zos
  

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