only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
+++ b/core/lib/Drupal/Core/Installer/InstallerServiceProvider.php
@@ -28,9 +28,11 @@ public function register(ContainerBuilder $container) {
     // Replace services with in-memory implementations.
     $definition = $container->getDefinition('cache_factory');
     $definition->setClass('Drupal\Core\Cache\MemoryBackendFactory');
-    $definition->setArguments(array());
+    $definition->setArguments([new Reference('serialization.phpserialize')]);
     $definition->setMethodCalls(array());
     $container
+      ->register('serialization.phpserialize', 'Drupal\Component\Serialization\PhpSerialize');
+    $container
       ->register('keyvalue', 'Drupal\Core\KeyValueStore\KeyValueMemoryFactory');
     $container
       ->register('keyvalue.expirable', 'Drupal\Core\KeyValueStore\KeyValueNullExpirableFactory');
only in patch2:
unchanged:
--- a/core/modules/simpletest/src/KernelTestBase.php
+++ b/core/modules/simpletest/src/KernelTestBase.php
@@ -313,7 +313,10 @@ public function containerBuild(ContainerBuilder $container) {
     $this->container->setParameter('language.default_values', $this->defaultLanguageData());
 
     $container->register('lock', 'Drupal\Core\Lock\NullLockBackend');
-    $container->register('cache_factory', 'Drupal\Core\Cache\MemoryBackendFactory');
+    $container->register('serialization.phpserialize', 'Drupal\Component\Serialization\PhpSerialize');
+    $container
+      ->register('cache_factory', 'Drupal\Core\Cache\MemoryBackendFactory')
+      ->addArgument(new Reference('serialization.phpserialize'));
 
     $container
       ->register('config.storage', 'Drupal\Core\Config\DatabaseStorage')
only in patch2:
unchanged:
--- a/core/modules/simpletest/src/Tests/SimpleTestTest.php
+++ b/core/modules/simpletest/src/Tests/SimpleTestTest.php
@@ -90,6 +90,7 @@ class: $class
   # Swap out a core service.
   cache.backend.database:
     class: Drupal\Core\Cache\MemoryBackendFactory
+    arguments: ['@serialization.phpserialize']
 EOD;
       file_put_contents($this->siteDirectory . '/testing.services.yml', $yaml);
 
only in patch2:
unchanged:
--- a/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php
+++ b/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php
@@ -34,6 +34,7 @@ class: $class
   # Swap out a core service.
   cache.backend.database:
     class: Drupal\Core\Cache\MemoryBackendFactory
+    arguments: ['@serialization.phpserialize']
 EOD;
     file_put_contents($this->siteDirectory . '/services.yml', $doc);
 
only in patch2:
unchanged:
--- a/core/tests/Drupal/KernelTests/KernelTestBase.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBase.php
@@ -596,7 +596,10 @@ public function register(ContainerBuilder $container) {
     $container
       ->register('lock', 'Drupal\Core\Lock\NullLockBackend');
     $container
-      ->register('cache_factory', 'Drupal\Core\Cache\MemoryBackendFactory');
+      ->register('serialization.phpserialize', 'Drupal\Component\Serialization\PhpSerialize');
+    $container
+      ->register('cache_factory', 'Drupal\Core\Cache\MemoryBackendFactory')
+      ->addArgument(new Reference('serialization.phpserialize'));
     $container
       ->register('keyvalue.memory', 'Drupal\Core\KeyValueStore\KeyValueMemoryFactory')
       // Must persist container rebuilds, or all data would vanish otherwise.