commit 991e1433dfd3295645141a21b26d5183ed255d02
Author: Nathaniel Catchpole <catch@35733.no-reply.drupal.org>
Date:   Fri Oct 30 17:41:12 2015 +0000

    Issue #2603152 by alexpott, Fabianx, neclimdul: Fix PHP 7 testbot failures

diff --git b/core/lib/Drupal/Core/DrupalKernel.php a/core/lib/Drupal/Core/DrupalKernel.php
index fdb3d86..0c16cb3 100644
--- b/core/lib/Drupal/Core/DrupalKernel.php
+++ a/core/lib/Drupal/Core/DrupalKernel.php
@@ -821,13 +821,6 @@ protected function initializeContainer() {
     // If there is no container and no cached container definition, build a new
     // one from scratch.
     if (!isset($container) && !isset($container_definition)) {
-      if (version_compare(phpversion(), '7.0.0-dev') >= 0) {
-        // The service graph implementation is prone to corruption during GC.
-        // Collect cycles now then disable the GC for the time of the compiler
-        // run.
-        // @see https://bugs.php.net/bug.php?id=70805
-        gc_collect_cycles();
-      }
       $container = $this->compileContainer();
 
       // Only dump the container if dumping is allowed. This is useful for