hg: jdk7/hotspot-gc/hotspot: 6742641: G1: NullPointerException during GCOld

[antonios.printezis at sun.com]

Changeset: 919e7959392a
Author:    tonyp
Date:      2008-09-22 09:56 -0400
URL:       http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/919e7959392a

6742641: G1: NullPointerException during GCOld
Summary: An update buffer is not processed correctly, which causes roots into the collection set not to be scanned and, hence, for the heap to be corrupted. The cause is that an object is accessed after it has been explicitly deleted, which causes a race.
Reviewed-by: jcoomes, ysr

! src/share/vm/gc_implementation/g1/dirtyCardQueue.cpp