Drupal 8 cv & civix cli tools not working
In our Drupal 8 - CiviCRM setup we found that both cv & civix were not working properly due to issues with the autoloading.
We fixed it by simplifying the $autoloader code in the loadBootStrap() method in CRM/Utils/System/Drupal8.php. The $autoloader var already contains the result of the getLoader() method by requiring the autoload from Drupal.
See my pull request on civicrm-core: https://github.com/civicrm/civicrm-core/pull/12496