Version 4.3.61.21 (cherry-pick)

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 812 matching lines @@
 }
 
 
 void Heap::EnsureFillerObjectAtTop() {
   // There may be an allocation memento behind every object in new space.
   // If we evacuate a not full new space or if we are on the last page of
   // the new space, then there may be uninitialized memory behind the top
   // pointer of the new space page. We store a filler object there to
   // identify the unused space.
   Address from_top = new_space_.top();
-  Address from_limit = new_space_.limit();
-  if (from_top < from_limit) {
-    int remaining_in_page = static_cast<int>(from_limit - from_top);
-    CreateFillerObjectAt(from_top, remaining_in_page);
+  // Check that from_top is inside its page (i.e., not at the end).
+  Address space_end = new_space_.ToSpaceEnd();
+  if (from_top < space_end) {
+    Page* page = Page::FromAddress(from_top);
+    if (page->Contains(from_top)) {
+      int remaining_in_page = static_cast<int>(page->area_end() - from_top);
+      CreateFillerObjectAt(from_top, remaining_in_page);
+    }
   }
 }
 
 
 bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
                           const char* collector_reason,
                           const v8::GCCallbackFlags gc_callback_flags) {
   // The VM is in the GC state until exiting this function.
   VMState<GC> state(isolate_);
 
@@ skipping 5592 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal