diff -u b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
--- b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
+++ b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
@@ -84,13 +84,22 @@
       $this->folders += $this->getCoreNames();
 
       $install_profile = Settings::get('install_profile');
+      $profile = drupal_get_profile();
       $extensions = $this->configStorage->read('core.extension');
-      // @todo Remove as part of https://www.drupal.org/node/2186491
+      // @todo Remove this scan as part of https://www.drupal.org/node/2186491
       $listing = new ExtensionDiscovery(\Drupal::root());
       if (!empty($extensions['module'])) {
         $modules = $extensions['module'];
         // Remove the install profile as this is handled later.
         unset($modules[$install_profile]);
+        $profile_list = $listing->scan('profile');
+        if ($profile && isset($profile_list[$profile])) {
+          // Prime the drupal_get_filename() static cache with the profile info file
+          // location so we can use drupal_get_path() on the active profile during
+          // the module scan.
+          // @todo Remove as part of https://www.drupal.org/node/2186491
+          drupal_get_filename('profile', $profile, $profile_list[$profile]->getPathname());
+        }
         $module_list_scan = $listing->scan('module');
         $module_list = array();
         foreach (array_keys($modules) as $module) {
@@ -114,9 +123,10 @@
         // The install profile can override module default configuration. We do
         // this by replacing the config file path from the module/theme with the
         // install profile version if there are any duplicates.
-        $profile = drupal_get_profile();
         if (isset($profile)) {
-          $profile_list = $listing->scan('profile');
+          if (!isset($profile_list)) {
+            $profile_list = $listing->scan('profile');
+          }
           if (isset($profile_list[$profile])) {
             $profile_folders = $this->getComponentNames(array($profile_list[$profile]));
             $this->folders = $profile_folders + $this->folders;