# HG changeset patch
# User shade
# Date 1557318434 -7200
# Node ID 5e5535d25467c3fe6283ec2f97f82e436678ec06
# Parent  6c1a7c2ee530abec363d9e99dcec688db8cfd64c
8223570: Shenandoah needs to acquire lock before CLDG::clear_claimed_marks
Reviewed-by: rkennke, tschatzl

diff -r 6c1a7c2ee530 -r 5e5535d25467 src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp	Wed May 08 07:56:49 2019 -0400
+++ b/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp	Wed May 08 14:27:14 2019 +0200
@@ -554,7 +554,10 @@
 }
 
 void ShenandoahTraversalGC::concurrent_traversal_collection() {
-  ClassLoaderDataGraph::clear_claimed_marks();
+  {
+    MutexLocker ml(ClassLoaderDataGraph_lock);
+    ClassLoaderDataGraph::clear_claimed_marks();
+  }
 
   ShenandoahGCPhase phase_work(ShenandoahPhaseTimings::conc_traversal);
   if (!_heap->cancelled_gc()) {