IJ25143: CRASH IN THE INTERPRETER AFTER OSR FROM INLINED SYNCHRONIZED METHOD IN DEBUGGING MODE

APAR status

• Closed as program error.

Error description

• Error Message: In the debugging mode, crash in the interpreter
  after a breakpoint is hit and code execution transit from
  inlined synchronized method into the interpreter
  .
  Stack Trace: VM_DebugBytecodeInterpreter::run(J9VMThread*) () at
  BytecodeInterpreter.hpp:8040
  debugBytecodeLoop () at BytecodeInterpreter.cpp:109
  c_cInterpreter () at xcinterp.s:160
  .
  This problem can happen in debugging mode on any platforms
  including X86, PPC and Z
  

Local fix

• -Xjit:disableInlining
  

Problem summary

• When a synchronized method exits through unhandled exception,
  it's required by the specification to release the monitor before
  exits. For inlined synchronized method, the JIT compiler inserts
  a synthetic handler to catch the exception and exit the monitor
  and rethrow the exception.
  The problem happens in debugging mode, when a breakpoint is hit
  and program execution transit from the synthetic handler to
  interpreter but resumes from the wrong place.
  

Problem conclusion

• the VM and the JIT compiler have been updated to identify the
  synthetic handler when the transition happens and resume the
  execution from the right place.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR6 FP15 (8.0.6.15)
  .
  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