--- old/src/hotspot/share/jfr/leakprofiler/utilities/saveRestore.cpp	2018-11-15 17:18:25.575872604 -0500
+++ new/src/hotspot/share/jfr/leakprofiler/utilities/saveRestore.cpp	2018-11-15 17:18:25.287872614 -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);
 }