--- a/src/hotspot/share/jfr/leakprofiler/utilities/saveRestore.cpp	Thu Nov 15 17:08:59 2018 +0100
+++ b/src/hotspot/share/jfr/leakprofiler/utilities/saveRestore.cpp	Fri Nov 16 07:30:40 2018 -0500
@@ -103,6 +103,7 @@
 }
 
 SaveRestoreCLDClaimBits::SaveRestoreCLDClaimBits() : _claim_state_closure() {
+  // interferes with GC, so walk all oops that GC would.
   ClassLoaderDataGraph::cld_do(&_claim_state_closure);
 }