Symfony version(s) affected

4.4.44, up to 6.1.x

Description

The race condition is appears when several processes are attempting to create a same Doctrine Proxy directory which does not yet exist and \RuntimeException is thrown in \Symfony\Bridge\Doctrine\CacheWarmer\ProxyCacheWarmer at line 53:

51            if (!is_dir($proxyCacheDir = $em->getConfiguration()->getProxyDir())) {
52                if (false === @mkdir($proxyCacheDir, 0777, true)) {
53                    throw new \RuntimeException(sprintf('Unable to create the Doctrine Proxy directory "%s".', $proxyCacheDir));
54               }

How to reproduce

This issue is difficult to reproduce, as any concurrency-related issues are. It appears when several processes are attempting to create a directory which does not yet exist. Specifically, when one process is between !is_dir() and @mkdir() after another process has already managed to create the directory.

Possible Solution

Add an extra check to \Symfony\Bridge\Doctrine\CacheWarmer\ProxyCacheWarmer to line 52:

52                if (false === @mkdir($proxyCacheDir, 0777, true) && !is_dir($proxyCacheDir)) {

Additional Context

No response