IJ13396: JAVA JIT: CRASH IN J9OUTOFMEMORY()

APAR status

• Closed as program error.

Error description

• Error Message: SIGSEGV JIT library.
  .
  Stack Trace:
  libj9jit26.so::j9OutOfMemory__FP11J9JITConfigP14TR_CompilationPC
  cPA85_l
  libj9jit26.so::exceededCompilationThreshold__9TR_MemoryFPCc
  libj9jit26.so::allocateHeapMemory__9TR_MemoryFUlQ2_13TR_MemoryBa
  se10ObjectType
  libj9jit26.so::createResolvedMethodWithSignature__11TR_J9VMBaseF
  P9TR_MemoryP20TR_Opaq...
  libj9jit26.so::createResolvedMethod__11TR_J9VMBaseFP9TR_MemoryP2
  0TR_OpaqueMethodBloc...
  libj9jit26.so::jitClassesRedefined
  libj9jvmti26.so::jitClassRedefineEvent AF67_66
  libj9jvmti26.so::redefineClassesCommon
  libj9jvmti26.so::jvmtiRetransformClasses
  libinstrument.so::retransformClasses
  libinstrument.so::Java_sun_instrument_InstrumentationImpl_retran
  sformClasses0
  .
  

Local fix

• Avoid using class re-definition (java agent that re-defines
  classes).
  

Problem summary

• The JIT hook for handling class re-definitions was allocating
  memory using a compile time allocation routine which should only
  have been used by the JIT when compiling a method. This results
  in a memory leak and could cause a crash in j9OutOfMemory()
  after leaking enough memory to reach the scratch space limit for
  the JIT compiler.
  

Problem conclusion

• The JIT was modified to eliminate memory allocation within the
  class re-definition hook.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR10 FP45 (7.0.10.45)
     7 R1 SR4 FP45  (7.1.4.45)
  .
  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