IV77804: CRASH IN TR_LOWPRIORITYCOMPILATIONSCHEDULER::PURGEENTRIESONCLASS LOADERUNLOADING

APAR status

• Closed as program error.

Error description

• Error Message: A SIGSEGV/GPF occurs while class unloading a
  sun.misc.Unsafe.defineAnonymousClass class.
  .
  Stack Trace:
  TR_LowPriorityCompilationScheduler::purgeEntriesOnClassLoaderUnl
  oading
  jitHookAnonClassesUnload
  J9HookDispatch
  MM_ClassLoaderManager::cleanUpClassLoadersStart
  MM_CollectorLanguageInterfaceJava::private_parallelGlobalGC_unlo
  adDeadClassLoaders
  MM_CollectorLanguageInterfaceJava::parallelGlobalGC_postMarkProc
  essin
  MM_ParallelGlobalGC::masterThreadGarbageCollect
  MM_ParallelGlobalGC::internalGarbageCollect
  MM_Collector::garbageCollect
  .
  

Local fix

• NA
  

Problem summary

• The problem occurs when a sun.misc.Unsafe.defineAnonymousClass
  class is unloaded and related metadata is not removed at the
  same time.
  

Problem conclusion

• The JVM has been updated to correctly remove metadata related to
  sun.misc.Unsafe.defineAnonymousClass classes when they are
  unloaded by the GC.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR2 (8.0.2.0)
  .
  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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

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