IJ31691: GPF EVENT FROM METHOD UNLINKCLASSLOADINGCONSTRAINTS

APAR status

• Closed as program error.

Error description

• Error Message: A GPF event is received.
  .
  Stack Trace: The native stack trace looks like this:
      j9vm29!unlinkClassLoadingConstraints()
      j9vm29!bcvHookClassesUnload()
      J9HOOKABLE29!J9HookDispatch()
      j9gc29!MM_ClassLoaderManager::cleanUpClassLoadersStart()
      j9gc29!MM_GlobalCollectorDelegate::unloadDeadClassLoaders()
      j9gc29!MM_GlobalCollectorDelegate::postMarkProcessing()
      j9gc29!MM_ParallelGlobalGC::masterThreadGarbageCollect()
  .
  

Local fix

Problem summary

• The problem is caused when JVM is trying to read some memory
  which has been freed while some classloaders or some classes are
  unloaded.
  

Problem conclusion

• The JVM has been updated so that no freed memory is to be read.
  
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP30  (8.0.6.30)
  .
  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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