hg: jdk9/hs-gc/hotspot: 8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs

[mikael.gerdin at oracle.com]

Changeset: 3d192acee119
Author:    mgerdin
Date:      2014-11-14 14:23 +0100
URL:       http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/3d192acee119

8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs
Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view
Reviewed-by: brutisso, dcubed, dholmes, stefank

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