PM81123: A potential segmentation fault can occur for eXtreme Scale maps that use the HashIndex.

APAR status

• Closed as program error.

Error description

• A trace condition exists that might lead to a segmentation
  fault for eXtreme Scale maps that use indexing. This problem
  occurs when you query an index on a map while entries are
  being removed from the map.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere eXtreme Scale users who have      *
  *                  enabled eXtremeMemory (XM) and use the      *
  *                  built-in HashIndex plug-in                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Container servers can fail if you       *
  *                      query an index while removing entries   *
  *                      from the same map.                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If you have enabled eXtremeMemory and use the
  built-in HashIndex plug-in, a container server might
  experience a segmentation fault.  This problem happens if you
  remove entries from a map while simultaneously running index
  queries on the map.
  You can determine when this problem occurs when a container
  disappears and leaves a Java core file in its working
  directory.  The Java core file contains a stack trace that goes
  through one of the find methods on the HashIndex class.
  

Problem conclusion

• This issue is resolved in V8.6 Fix Pack 1. However, you can
  avoid this problem by not running index queries while removing
  entries from the same map.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP