IV94682: ASSERTION OR CRASH DURING GARBAGE COLLECTION

APAR status

• Closed as program error.

Error description

• Error Message: A common symptom is for the Garbage Collector to
  report this assertion failure:
  "Object neither in heap nor stack-allocated"
  However a crash during Garbage Collection is also possible.
  .
  Stack Trace:
  .
  This problem can only happen if a java agent or debugger is
  attached. This problem can happen at all optimization levels
  except for noOpt.
  

Local fix

• The problem can be avoided with the following Java command line
  option:
  -Xjit:disableInlining
  Note, this likely will significantly decrease performance.
  

Problem summary

• When inlining a method into another method when the JRE has been
  launched with an agent or debugger attached, information
  necessary for the JIT compiler to keep track of Monitors was
  incorrectly propagated to one of the code paths which caused the
  JIT compiler to generate incorrect metadata used by Garbage
  Collection to keep track of objects in JIT compiled methods. The
  incorrect metadata for the Monitor caused the Garbage Collector
  to treat a register as if it contained the Monitor object when
  it did not, causing the Garbage Collector to throw an assertion
  error or crash.
  

Problem conclusion

• The JIT compiler has been updated to correctly propagate
  information in the code paths specific to this problem.
  .
  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:

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP