Handle a terminating context in messageHandlerInWorker().

Source/bindings/core/v8/V8Initializer.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 208 matching lines @@
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     ScriptState* scriptState = ScriptState::current(isolate);
     // During the frame teardown, there may not be a valid context.
     if (ExecutionContext* context = scriptState->executionContext()) {
         String errorMessage = toCoreString(message->Get());
         TOSTRING_VOID(V8StringResource<>, sourceURL, message->GetScriptOrigin().ResourceName());
 
         RefPtrWillBeRawPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, sourceURL, message->GetLineNumber(), message->GetStartColumn() + 1, &DOMWrapperWorld::current(isolate));
         AccessControlStatus corsStatus = message->IsSharedCrossOrigin() ? SharableCrossOrigin : NotSharableCrossOrigin;
 
-        V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, scriptState->context()->Global(), isolate);
-        context->reportException(event.release(), nullptr, corsStatus);
+        // If execution termination has been triggered as part of constructing
+        // the error event from the v8::Message, quietly leave.
+        if (!v8::V8::IsExecutionTerminating(isolate)) {
+            V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, scriptState->context()->Global(), isolate);
+            context->reportException(event.release(), nullptr, corsStatus);
+        }
     }
 
     isReportingException = false;
 }
 
 static const int kWorkerMaxStackSize = 500 * 1024;
 
 void V8Initializer::initializeWorker(v8::Isolate* isolate)
 {
     initializeV8Common(isolate);
 
     v8::V8::AddMessageListener(messageHandlerInWorker);
     v8::V8::SetFatalErrorHandler(reportFatalErrorInWorker);
 
     v8::ResourceConstraints resourceConstraints;
     uint32_t here;
     resourceConstraints.set_stack_limit(&here - kWorkerMaxStackSize / sizeof(uint32_t*));
     v8::SetResourceConstraints(isolate, &resourceConstraints);
 }
 
 } // namespace blink