API Platform version(s) affected: 3.3.6

Description
api/vendor/symfony/http-kernel/Kernel.php get stuck at line 420: if (!flock($lock, \LOCK_EX | \LOCK_NB, $wouldBlock) && !flock($lock, $wouldBlock ? \LOCK_SH : \LOCK_EX)) { no pun intended. But it happens after several changes to entity resources and requests to http://localhost/docs.

How to reproduce
Run this project remove VOLUME in order to get var accessible in local filesystem. And make changes to entities resources, then go to http://localhost/docs and see the timout in 30s happen.