diff --git a/core/lib/Drupal/Core/Config/ConfigInstaller.php b/core/lib/Drupal/Core/Config/ConfigInstaller.php
index 04f517d..a77bb1c 100644
--- a/core/lib/Drupal/Core/Config/ConfigInstaller.php
+++ b/core/lib/Drupal/Core/Config/ConfigInstaller.php
@@ -280,7 +280,10 @@ protected function createConfiguration($collection, array $config_to_create) {
       }
       if ($config_to_create[$name] !== FALSE) {
         $new_config->setData($config_to_create[$name]);
-        if (!$this->isSyncing()) {
+        // Add a hash to configuration created through the installer so it is
+        // possible to know if the configuration was created by installing an
+        // extension and to track which version of the default config was used.
+        if (!$this->isSyncing() && $collection == StorageInterface::DEFAULT_COLLECTION) {
           $new_config->set('_core.default_config_hash', Crypt::hashBase64(serialize($config_to_create[$name])));
         }
       }
diff --git a/core/modules/config/src/Tests/ConfigCRUDTest.php b/core/modules/config/src/Tests/ConfigCRUDTest.php
index e127892..3d61c9e 100644
--- a/core/modules/config/src/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/src/Tests/ConfigCRUDTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config\Tests;
 
+use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Config\ConfigNameException;
 use Drupal\Core\Config\ConfigValueException;
@@ -263,6 +264,7 @@ public function testDataTypes() {
       'string' => 'string',
       'string_int' => '1',
     );
+    $data['_core']['default_config_hash'] = Crypt::hashBase64(serialize($data));
     $this->assertIdentical($config->get(), $data);
 
     // Re-set each key using Config::set().
diff --git a/core/modules/config/src/Tests/ConfigDiffTest.php b/core/modules/config/src/Tests/ConfigDiffTest.php
index efb5db3..372970f 100644
--- a/core/modules/config/src/Tests/ConfigDiffTest.php
+++ b/core/modules/config/src/Tests/ConfigDiffTest.php
@@ -35,13 +35,10 @@ function testDiff() {
     $add_key = 'biff';
     $add_data = 'bangpow';
     $change_data = 'foobar';
-    $original_data = array(
-      'foo' => 'bar',
-      '404' => 'herp',
-    );
 
     // Install the default config.
     $this->installConfig(array('config_test'));
+    $original_data = \Drupal::config($config_name)->get();
 
     // Change a configuration value in sync.
     $sync_data = $original_data;
diff --git a/core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php b/core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php
index e10dfe0..36697a5 100644
--- a/core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config\Tests;
 
+use Drupal\Component\Utility\Crypt;
 use Drupal\Core\Config\InstallStorage;
 use Drupal\simpletest\WebTestBase;
 use Drupal\Core\Config\FileStorage;
@@ -48,6 +49,7 @@ function testInstallProfileConfigOverwrite() {
         'requirements_error' => 1209600,
       ),
     );
+    $expected_profile_data['_core']['default_config_hash'] = Crypt::hashBase64(serialize($expected_profile_data));
 
     // Verify that the original data matches. We have to read the module config
     // file directly, because the install profile default system.cron.yml
diff --git a/core/modules/config/src/Tests/ConfigSingleImportExportTest.php b/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
index f08c7bd..088129a 100644
--- a/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
+++ b/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
@@ -202,7 +202,7 @@ public function testExport() {
     $this->assertIdentical($expected_options, array_intersect($expected_options, $options), 'The expected configuration files are listed.');
 
     $this->drupalGet('admin/config/development/configuration/single/export/system.simple/system.image');
-    $this->assertFieldByXPath('//textarea[@name="export"]', "toolkit: gd\n", 'The expected system configuration is displayed.');
+    $this->assertFieldByXPath('//textarea[@name="export"]', "toolkit: gd\n_core:\n  default_config_hash: durWHaKeBaq4d9Wpi4RqwADj1OufDepcnJuhVLmKN24\n", 'The expected system configuration is displayed.');
 
     $this->drupalGet('admin/config/development/configuration/single/export/date_format');
     $this->assertFieldByXPath('//select[@name="config_type"]//option[@selected="selected"]', t('Date format'), 'The date format entity type is selected when specified in the URL.');
diff --git a/core/modules/user/src/Tests/Migrate/d7/MigrateUserFloodTest.php b/core/modules/user/src/Tests/Migrate/d7/MigrateUserFloodTest.php
index 786fcd2..020e15c 100644
--- a/core/modules/user/src/Tests/Migrate/d7/MigrateUserFloodTest.php
+++ b/core/modules/user/src/Tests/Migrate/d7/MigrateUserFloodTest.php
@@ -35,6 +35,9 @@ public function testMigration() {
       'ip_window' => 7200,
       'user_limit' => 22,
       'user_window' => 86400,
+      '_core' => [
+        'default_config_hash' => 'UYfMzeP1S8jKm9PSvxf7nQNe8DsNS-3bc2WSNNXBQWs',
+      ],
     ];
     $this->assertIdentical($expected, $this->config('user.flood')->get());
   }