src/share/vm/opto/stringopts.cpp

@@ -1601,10 +1601,11 @@
       // below will overwrite the entire array
       AllocateArrayNode* char_alloc = AllocateArrayNode::Ideal_array_allocation(char_array, _gvn);
       char_alloc->maybe_set_complete(_gvn);
 
       // Now copy the string representations into the final char[]
+      char_array = __ shenandoah_write_barrier(char_array);
       Node* start = __ intcon(0);
       for (int argi = 0; argi < sc->num_arguments(); argi++) {
         Node* arg = sc->argument(argi);
         switch (sc->mode(argi)) {
           case StringConcat::IntMode: {