Add debug code to catch faulty interceptor

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 4558 matching lines @@
         Handle<Map> store_target_map;
         if (it->GetReceiver()->IsJSObject()) {
           store_target_map = handle(it->GetStoreTarget()->map(), it->isolate());
         }
         if (it->HolderIsReceiverOrHiddenPrototype()) {
           Maybe<bool> result =
               JSObject::SetPropertyWithInterceptor(it, should_throw, value);
           if (result.IsNothing() || result.FromJust()) return result;
           // Interceptor modified the store target but failed to set the
           // property.
+          // TODO(jochen): Remove after we've identified the faulty interceptor.
+          if (!store_target_map.is_null() &&
+              *store_target_map != it->GetStoreTarget()->map()) {
+            it->isolate()->PushStackTraceAndDie(
+                0xabababaa, v8::ToCData<void*>(it->GetInterceptor()->setter()),
+                nullptr, 0xabababab);
+          }
           Utils::ApiCheck(store_target_map.is_null() ||
                               *store_target_map == it->GetStoreTarget()->map(),
                           it->IsElement() ? "v8::IndexedPropertySetterCallback"
                                           : "v8::NamedPropertySetterCallback",
                           "Interceptor silently changed store target.");
         } else {
           Maybe<PropertyAttributes> maybe_attributes =
               JSObject::GetPropertyAttributesWithInterceptor(it);
           if (!maybe_attributes.IsJust()) return Nothing<bool>();
           if ((maybe_attributes.FromJust() & READ_ONLY) != 0) {
@@ skipping 14680 matching lines @@
   for (PrototypeIterator iter(isolate, this, kStartAtReceiver,
                               PrototypeIterator::END_AT_NULL);
        !iter.IsAtEnd(); iter.AdvanceIgnoringProxies()) {
     if (iter.GetCurrent<Object>()->IsJSProxy()) return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8