diff -r 3c905e67e380 -r 36cb654a690f src/hotspot/share/oops/instanceKlass.cpp
--- a/src/hotspot/share/oops/instanceKlass.cpp	Thu Jun 06 13:46:01 2019 +0300
+++ b/src/hotspot/share/oops/instanceKlass.cpp	Thu Jun 06 13:46:03 2019 +0300
@@ -438,6 +438,8 @@
   _static_field_size(parser.static_field_size()),
   _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
   _itable_len(parser.itable_size()),
+  _init_thread(NULL),
+  _init_state(allocated),
   _reference_type(parser.reference_type())
 {
   set_vtable_length(parser.vtable_size());
@@ -1071,11 +1073,13 @@
   Handle h_init_lock(THREAD, init_lock());
   if (h_init_lock() != NULL) {
     ObjectLocker ol(h_init_lock, THREAD);
+    set_init_thread(NULL); // reset _init_thread before changing _init_state
     set_init_state(state);
     fence_and_clear_init_lock();
     ol.notify_all(CHECK);
   } else {
     assert(h_init_lock() != NULL, "The initialization state should never be set twice");
+    set_init_thread(NULL); // reset _init_thread before changing _init_state
     set_init_state(state);
   }
 }
@@ -3710,6 +3714,7 @@
                                                : (_init_state < state);
   assert(good_state || state == allocated, "illegal state transition");
 #endif
+  assert(_init_thread == NULL, "should be cleared before state change");
   _init_state = (u1)state;
 }