dd() hangs after first call when installing symfony/validator in fresh project

[MarStefo]

Hi everyone,

I’ve run into a strange issue and I’d like to check if anyone else has experienced the same problem (and possibly solved it).

Steps to reproduce:

• Clone a fresh Symfony project from GitHub.
• Install the required Symfony components (symfony/twig-bundle, composer require symfony/orm-pack, composer require --dev symfony/maker-bundle, composer require --dev symfony/var-dumper)
• Run composer require symfony/validator.
• Use dd() in a controller or route.

What happens:

• On the first request, dd() works as expected.
• On subsequent requests to the same page, the browser keeps loading indefinitely.
• The PHP container is still running and responds, so it doesn’t crash entirely.
• If I replace dd() with var_dump(), everything works fine — the issue seems to be related specifically to dd() (and die()).

Expected behavior:

• dd() should dump the variable and stop execution consistently, without causing hangs on following requests.

Has anyone else run into this issue after requiring symfony/validator?
If needed, I can upload additional files (composer.json, Symfony config, Docker setup, etc.) to help debug the problem.

Thanks in advance! 🙏

[7-zete-7]

Hi, @MarStefo!

It looks like a similar issue has been reported before (php/frankenphp#1590, php/frankenphp#1423). The issue was supposed to be fixed in php/frankenphp#1592 (since FrankenPHP v1.6.1).

Try to rebuild the image with the latest version of FrankenPHP and, if that doesn't help, create an issue in the FrankenPHP repository.

[MarStefo]

Thanks for your reply! 🙏 @7-zete-7
I’ve checked the version and I’m currently running:

• FrankenPHP v1.9.1
• PHP 8.4.12
• Caddy v2.10.2

The issue still seems to occur, so it’s very likely I should open an issue in the FrankenPHP repository 😬

[MarStefo]

I managed to solve the issue inspired by this thread: dunglas/symfony-docker#846.
I had to sacrifice the worker, but if it doesn’t work properly with it, this step was necessary for now. Later on, I’ll try to reintroduce it.

Cheers! 👋

[maxhelias]

It does not appear to be the same error, even though both occur in worker mode.
It would be interesting to try with version v1.6.1 of FrankenPHP to see if this is a regression or not.

[MarStefo]

Hello @maxhelias
But v1.6.1 is an older release — I’m currently running the latest one (v1.9.1).
It’s worth noting that the hang only occurs after installing symfony/validator. I tested this with two fresh projects, and on the second one I carefully tracked when the issue started.

To reproduce, it’s enough to run dd("hello"); and then reload the page: on the second request, it hangs.