diff -u b/core/core.services.yml b/core/core.services.yml
--- b/core/core.services.yml
+++ b/core/core.services.yml
@@ -479,7 +479,7 @@
     class: Drupal\Core\EventSubscriber\RouterListener
     tags:
       - { name: event_subscriber }
-    arguments: ['@router', '@route_match_stack']
+    arguments: ['@router', '@route_match_stack', '@request_stack', '@router.request_context']
   content_negotiation:
     class: Drupal\Core\ContentNegotiation
   view_subscriber:
reverted:
--- b/core/includes/install.core.inc
+++ a/core/includes/install.core.inc
@@ -19,11 +19,9 @@
 use Drupal\Core\StringTranslation\Translator\FileTranslation;
 use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\Core\Routing\RouteMatch;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Routing\Route;
 
 use GuzzleHttp\Exception\RequestException;
 
@@ -370,7 +368,6 @@
   $container->enterScope('request');
   $container->set('request', $request, 'request');
   $container->get('request_stack')->push($request);
-  $container->get('route_match_stack')->push(new RouteMatch('', new Route('')));
 
   // Register the file translation service.
   if (isset($GLOBALS['config']['locale.settings']['translation.path'])) {
diff -u b/core/lib/Drupal/Core/EventSubscriber/RouterListener.php b/core/lib/Drupal/Core/EventSubscriber/RouterListener.php
--- b/core/lib/Drupal/Core/EventSubscriber/RouterListener.php
+++ b/core/lib/Drupal/Core/EventSubscriber/RouterListener.php
@@ -7,11 +7,13 @@
 
 namespace Drupal\Core\EventSubscriber;
 
+use Drupal\Core\Routing\NullRouteMatch;
 use Drupal\Core\Routing\RouteMatch;
 use Drupal\Core\Routing\RouteMatchStack;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
@@ -20,7 +22,7 @@
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
 use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
-use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RequestContext;
 
 /**
  * Performs routing.
@@ -29,6 +31,8 @@
 
   protected $matcher;
   protected $routeMatchStack;
+  protected $requestStack;
+  protected $requestContext;
 
   /**
    * Constructor.
@@ -37,10 +41,16 @@
    *   The Request matcher.
    * @param \Drupal\Core\Routing\RouteMatchStack $route_match_stack
    *   The RouteMatch stack.
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   The request stack.
+   * @param \Symfony\Component\Routing\RequestContext $request_context
+   *   The request context.
    */
-  public function __construct(RequestMatcherInterface $matcher, RouteMatchStack $route_match_stack) {
+  public function __construct(RequestMatcherInterface $matcher, RouteMatchStack $route_match_stack, RequestStack $request_stack, RequestContext $request_context) {
     $this->matcher = $matcher;
     $this->routeMatchStack = $route_match_stack;
+    $this->requestStack = $request_stack;
+    $this->requestContext = $request_context;
   }
 
   /**
@@ -55,14 +65,19 @@
   public function onKernelRequest(GetResponseEvent $event) {
     $request = $event->getRequest();
 
+    // Initialize the context that is also used by other services, such as the
+    // URL generator, if they share the same context instance.
+    $this->requestContext->fromRequest($request);
+
+    // We might return early or throw an exception prior to calling
+    // processRouteArguments(), but we need something pushed onto the stack
+    // in all cases.
+    $this->routeMatchStack->push(new NullRouteMatch());
+
     // The controller might already be set, for example, as part of handling a
     // subrequest from an exception handler (@see
     // \Symfony\Component\HttpKernel\EventListener\ExceptionListener).
     if ($request->attributes->has('_controller')) {
-      // If we're skipping routing, then we still need to push something onto
-      // the route match stack.
-      // @todo Would pushing NULL be better than a fake RouteMatch?
-      $this->routeMatchStack->push(new RouteMatch('', new Route('')));
       return;
     }
 
@@ -114,6 +129,10 @@
       }
     }
     $route_match = new RouteMatch($route_name, $route, $arguments, $raw_arguments);
+
+    // Now that we have a route match, replace the NULL item that was added at
+    // the beginning of onKernelRequest().
+    $this->routeMatchStack->pop();
     $this->routeMatchStack->push($route_match);
 
     // @todo Remove. See https://drupal.org/node/2124749.
@@ -121,16 +140,16 @@
   }
 
   /**
-   * Pops the route match stack when the request is finished.
+   * Synchronizes route match stack and request context to the parent request.
    *
    * @param \Symfony\Component\HttpKernel\Event\FinishRequestEvent $event
    *   The Event to process.
    */
   public function onKernelFinishRequest(FinishRequestEvent $event) {
     $this->routeMatchStack->pop();
+    $this->requestContext->fromRequest($this->requestStack->getParentRequest());
   }
 
-
   /**
    * {@inheritdoc}
    */
diff -u b/core/lib/Drupal/Core/Routing/RouteMatch.php b/core/lib/Drupal/Core/Routing/RouteMatch.php
--- b/core/lib/Drupal/Core/Routing/RouteMatch.php
+++ b/core/lib/Drupal/Core/Routing/RouteMatch.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains Drupal\Core\Routing\RouteMatchStack.
+ * Contains Drupal\Core\Routing\RouteMatch.
  */
 
 namespace Drupal\Core\Routing;
diff -u b/core/lib/Drupal/Core/Routing/RouteMatchStack.php b/core/lib/Drupal/Core/Routing/RouteMatchStack.php
--- b/core/lib/Drupal/Core/Routing/RouteMatchStack.php
+++ b/core/lib/Drupal/Core/Routing/RouteMatchStack.php
@@ -22,6 +22,7 @@
  * @see Symfony\Component\HttpFoundation\RequestStack
  *
  */
+
 class RouteMatchStack {
 
   protected $routeMatches = array();
@@ -31,11 +32,11 @@
   }
 
   public function pop() {
-    return array_pop($this->routeMatches);
+    array_pop($this->routeMatches);
   }
 
   public function getCurrentRouteMatch() {
-    return end($this->routeMatches) ?: NULL;
+    return end($this->routeMatches) ?: new NullRouteMatch();
   }
 
 }
only in patch2:
unchanged:
--- /dev/null
+++ b/core/lib/Drupal/Core/Routing/NullRouteMatch.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Contains Drupal\Core\Routing\NullRouteMatch.
+ */
+
+namespace Drupal\Core\Routing;
+
+use Symfony\Component\HttpFoundation\ParameterBag;
+
+class NullRouteMatch extends RouteMatch {
+
+  public function __construct() {
+    $this->routeName = NULL;
+    $this->route = NULL;
+    $this->arguments = new ParameterBag();
+    $this->rawArguments = new ParameterBag();
+  }
+
+}