I've setup a new instance of owncloud 10 on Ubuntu 16.04, and it has been working great. I was using APCu for memcache, but decided to install Redis to get rid of the pesky warning about Transactional File Locking.
When I add 'memcache.locking' => '\OC\Memcache\Redis' (and all the redis server info) to config.php, any new users are unable to login. Existing users are fine, but any new users created while Redis is enabled have to be deleted and recreated after it is disabled. For what it's worth, I don't see any issues when I add 'memcache.local' => '\OC\Memcache\Redis', but its hard to say if it is really working or not.
I think I probably have something wrong in my Redis server config. Would anyone be willing to post theirs?