hg: jdk/sandbox: 8223391: Unsynchronized iteration of ClassLoaderDataGraph

[chris.hegarty at oracle.com]

Changeset: 845f5a35241b
Author:    coleenp
Date:      2019-05-08 06:40 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/845f5a35241b

8223391: Unsynchronized iteration of ClassLoaderDataGraph
Summary: lock in G1 before clear_claimed_marks
Reviewed-by: hseigel, lfoltan, tschatzl

! src/hotspot/share/classfile/classLoaderDataGraph.cpp
! src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp