If using MVCEvents::INTERACTIVE_LOGIN listener, when the wrapped user is serialized to the session if fails at it gets stuck in a loop.  When serializing the location of the the user content it also has content and it in turn is serialized and begins the loop.

To reproduce

From a clean install add 

https://gist.github.com/wizhippo/06f480a44ff8d114852385b478eee726

vendor/symfony/security-http/Firewall/ContextListener.php:178 is where the serialization occurs