Issue 337 - Race condition preventing initialization on first run

lib/storage/io.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 98 matching lines @@
   {
     var path = this._getFilePath(file);
     delete ext.storage[path];
     delete ext.storage[path + "/lastModified"];
     callback(null);
   },
 
   statFile: function(file, callback)
   {
     var path = this._getFilePath(file);
-    callback(null, {
+
+    // This needs to use Utils.runAsync(), otherwise FilterStorage might
+    // initialize too early - see #337.
+    require("utils").Utils.runAsync(callback.bind(null, null, {
       exists: path in ext.storage,
       isDirectory: false,
       isFile: true,
       lastModified: parseInt(ext.storage[path + "/lastModified"], 10) || 0
-    });
+    }));
   }
 };