--- a/src/hotspot/share/gc/shared/stringdedup/stringDedupThread.cpp	Wed Apr 24 19:51:38 2019 -0700
+++ b/src/hotspot/share/gc/shared/stringdedup/stringDedupThread.cpp	Thu Apr 25 08:55:49 2019 +0200
@@ -66,10 +66,10 @@
   }
 };
 
-// The CDS archive does not include the string dedupication table. Only the string
+// The CDS archive does not include the string deduplication table. Only the string
 // table is saved in the archive. The shared strings from CDS archive need to be
-// added to the string dedupication table before deduplication occurs. That is
-// done in the begining of the StringDedupThread (see StringDedupThread::do_deduplication()).
+// added to the string deduplication table before deduplication occurs. That is
+// done in the beginning of the StringDedupThread (see StringDedupThread::do_deduplication()).
 void StringDedupThread::deduplicate_shared_strings(StringDedupStat* stat) {
   StringDedupSharedClosure sharedStringDedup(stat);
   StringTable::shared_oops_do(&sharedStringDedup);

--- a/src/hotspot/share/gc/shared/stringdedup/stringDedupThread.inline.hpp	Wed Apr 24 19:51:38 2019 -0700
+++ b/src/hotspot/share/gc/shared/stringdedup/stringDedupThread.inline.hpp	Thu Apr 25 08:55:49 2019 +0200
@@ -33,7 +33,11 @@
 void StringDedupThreadImpl<S>::do_deduplication() {
   S total_stat;
 
-  deduplicate_shared_strings(&total_stat);
+  {
+    // Block safepoints while deduplicating shared strings
+    SuspendibleThreadSetJoiner sts_join;
+    deduplicate_shared_strings(&total_stat);
+  }
 
   // Main loop
   for (;;) {