Put extra information to the stack when crbug/454297 happens.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index caca223ba90c2514082ce01fb2c3458ccda1a4a8..37651e7133eb9c367b1cdff17e7a2df5b73ddadf 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2792,6 +2792,14 @@ class PointersUpdatingVisitor : public ObjectVisitor {
 
     HeapObject* heap_obj = HeapObject::cast(obj);
 
+// TODO(ishell): remove, once crbug/454297 is caught.
+#if V8_TARGET_ARCH_64_BIT
+    const uintptr_t kBoundary = V8_UINT64_C(1) << 48;
+    STATIC_ASSERT(kBoundary > 0);
+    if (reinterpret_cast<uintptr_t>(heap_obj->address()) >= kBoundary) {
+      CheckLayoutDescriptorAndDie(heap, slot);
+    }
+#endif
     MapWord map_word = heap_obj->map_word();
     if (map_word.IsForwardingAddress()) {
       DCHECK(heap->InFromSpace(heap_obj) ||
@@ -2809,10 +2817,99 @@ class PointersUpdatingVisitor : public ObjectVisitor {
  private:
   inline void UpdatePointer(Object** p) { UpdateSlot(heap_, p); }
 
+  static void CheckLayoutDescriptorAndDie(Heap* heap, Object** slot);
+
   Heap* heap_;
 };
 
 
+#if V8_TARGET_ARCH_64_BIT
+// TODO(ishell): remove, once crbug/454297 is caught.
+void PointersUpdatingVisitor::CheckLayoutDescriptorAndDie(Heap* heap,
+                                                          Object** slot) {
+  const int kDataBufferSize = 1280;
+  uintptr_t data[kDataBufferSize] = {0};
+  int index = 0;
+  data[index++] = 0x10aaaaaaaaUL;  // begin marker
+  Address slot_address = reinterpret_cast<Address>(slot);
+
+  uintptr_t space_owner_id = 0xb001;
+  if (heap->new_space()->ToSpaceContains(slot_address)) {
+    space_owner_id = 1;
+  } else if (heap->new_space()->FromSpaceContains(slot_address)) {
+    space_owner_id = 2;
+  } else if (heap->old_pointer_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 3;
+  } else if (heap->old_data_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 4;
+  } else if (heap->code_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 5;
+  } else if (heap->map_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 6;
+  } else if (heap->cell_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 7;
+  } else if (heap->property_cell_space()->ContainsSafe(slot_address)) {
+    space_owner_id = 8;
+  } else {
+    // Lo space or other.
+    space_owner_id = 9;
+  }
+  data[index++] = space_owner_id;
+  data[index++] = 0x20aaaaaaaaUL;
+
+  // Find map word lying near before the slot address (usually the map word is
+  // at -3 words from the slot but just in case we look up further.
+  Object** map_slot = slot;
+  bool found = false;
+  const int kMaxDistanceToMap = 64;
+  for (int i = 0; i < kMaxDistanceToMap; i++, map_slot -= kPointerSize) {
+    Address map_address = reinterpret_cast<Address>(*map_slot);
+    if (heap->map_space()->ContainsSafe(map_address)) {
+      found = true;
+      break;
+    }
+  }
+  data[index++] = found;
+  data[index++] = 0x30aaaaaaaaUL;
+  if (found) {
+    Address obj_address = reinterpret_cast<Address>(map_slot);
+    Address end_of_page =
+        reinterpret_cast<Address>(Page::FromAddress(obj_address)) +
+        Page::kPageSize;
+    Address end_address =
+        Min(obj_address + kPointerSize * kMaxDistanceToMap, end_of_page);
+    int size = static_cast<int>(end_address - obj_address);
+    data[index++] = size / kPointerSize;
+    data[index++] = 0x40aaaaaaaaUL;
+    memcpy(&data[index], reinterpret_cast<void*>(map_slot), size);
+    index += size / kPointerSize;
+    data[index++] = 0x50aaaaaaaaUL;
+
+    HeapObject* object = HeapObject::FromAddress(obj_address);
+    data[index++] = reinterpret_cast<uintptr_t>(object);
+    data[index++] = 0x60aaaaaaaaUL;
+
+    Map* map = object->map();
+    data[index++] = reinterpret_cast<uintptr_t>(map);
+    data[index++] = 0x70aaaaaaaaUL;
+
+    LayoutDescriptor* layout_descriptor = map->layout_descriptor();
+    data[index++] = reinterpret_cast<uintptr_t>(layout_descriptor);
+    data[index++] = 0x80aaaaaaaaUL;
+
+    memcpy(&data[index], reinterpret_cast<void*>(map->address()), Map::kSize);
+    index += Map::kSize / kPointerSize;
+    data[index++] = 0x90aaaaaaaaUL;
+  }
+
+  data[index++] = 0xeeeeeeeeeeUL;
+  DCHECK(index < kDataBufferSize);
+  base::OS::PrintError("Data: %p\n", static_cast<void*>(data));
+  base::OS::Abort();
+}
+#endif
+
+
 static void UpdatePointer(HeapObject** address, HeapObject* object) {
   Address new_addr = Memory::Address_at(object->address());