Version 0.8.10.4

dart/runtime/lib/isolate.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 248 matching lines @@
 
   return Spawn(arguments, new IsolateSpawnState(canonical_uri));
 }
 
 
 DEFINE_NATIVE_ENTRY(Isolate_mainPort, 0) {
   const Object& port = Object::Handle(ReceivePortCreate(isolate->main_port()));
   if (port.IsError()) {
     Exceptions::PropagateError(Error::Cast(port));
   }
+
+  // The control port is being accessed as a regular port from Dart code. This
+  // is most likely due to the _startIsolate code in dart:isolate. Account for
+  // this by increasing the number of open control ports.
+  isolate->message_handler()->increment_control_ports();
+
   return port.raw();
 }
 
 }  // namespace dart