IV73125: HIGH CPU USAGE IN JAVA_COM_IBM_LANG_MANAGEMENT_MEMORYMXBEANIMPL_GETNONHEAPMEMORYUSAGEIMPL()

APAR status

• Closed as program error.

Error description

• Error Message: JVM process appears to consume high amount of
  CPU. Consecutive javacores taken at the time of the hang will
  show one thread which seems to be be always executing the
  following
  stack:com/ibm/lang/management/MemoryMXBeanImpl.getNonHeapMemoryU
  sageImplcom/ibm/lang/management/MemoryMXBeanImpl.getNonHeapMemor
  yUsage....
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• There was an error in the way that the JVM was tracking small
  free native memory blocks which caused a loop in the freelist.
  

Problem conclusion

• The JVM has been updated to correctly manage its freelist.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR1 FP10  (8.0.1.10)
  .
  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

     UP