Testbot 2948 failed three different patches in the same way in a row

For example: https://qa.drupal.org/pifr/test/1038148 (as long as no one submits a retest...

The fails are:

Test name	Pass	Fail	Exception
Drupal\config\Tests\ConfigImportAllTest	385	1	1
Drupal\node\Tests\NodeTranslationUITest	400	1	0
Drupal\system\Tests\Installer\StandardInstallerTest	40	3	1
Drupal\system\Tests\Module\InstallUninstallTest	1348	225	0
Drupal\toolbar\Tests\ToolbarAdminMenuTest	447	3	0

It is really odd that exactly the same tests should fail.