--- a/src/hotspot/share/prims/stackwalk.cpp	Tue Apr 03 10:27:46 2018 +0200
+++ b/src/hotspot/share/prims/stackwalk.cpp	Tue Apr 03 13:15:27 2018 +0200
@@ -48,7 +48,7 @@
 bool BaseFrameStream::check_magic(objArrayHandle frames_array) {
   oop   m1 = frames_array->obj_at(magic_pos);
   jlong m2 = _anchor;
-  if (m1 == _thread->threadObj() && m2 == address_value())  return true;
+  if (oopDesc::equals(m1, _thread->threadObj()) && m2 == address_value())  return true;
   return false;
 }
 
@@ -79,7 +79,7 @@
 {
   assert(thread != NULL && thread->is_Java_thread(), "");
   oop m1 = frames_array->obj_at(magic_pos);
-  if (m1 != thread->threadObj())      return NULL;
+  if (!oopDesc::equals(m1, thread->threadObj())) return NULL;
   if (magic == 0L)                    return NULL;
   BaseFrameStream* stream = (BaseFrameStream*) (intptr_t) magic;
   if (!stream->is_valid_in(thread, frames_array))   return NULL;