diff -r 16d6fc55611d -r 4fb7f7e3e05b src/hotspot/share/gc/g1/g1RemSet.cpp
--- a/src/hotspot/share/gc/g1/g1RemSet.cpp	Tue Feb 19 12:56:02 2019 +0100
+++ b/src/hotspot/share/gc/g1/g1RemSet.cpp	Tue Feb 19 12:56:02 2019 +0100
@@ -409,6 +409,10 @@
 
 void G1ScanRSForRegionClosure::scan_strong_code_roots(HeapRegion* r) {
   EventGCPhaseParallel event;
+  // We pass a weak code blobs closure to the remembered set scanning because we want to avoid
+  // treating the nmethods visited to act as roots for concurrent marking.
+  // We only want to make sure that the oops in the nmethods are adjusted with regard to the
+  // objects copied by the current evacuation.
   r->strong_code_roots_do(_pss->closures()->weak_codeblobs());
   event.commit(GCId::current(), _worker_i, G1GCPhaseTimes::phase_name(G1GCPhaseTimes::CodeRoots));
 }