Symfony version(s) affected

6.3.2

Description

Currently when one is in debug mode and has a large error message, it might that the following error occurs:

[TypeError]
HTTP 500 Internal Server Error
Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer::formatFileFromText(): Return value must be of type string, null returned

Which is not due to the original error, but rather a problem in the error rendering.

The problematic place seems to be: https://github.com/symfony/error-handler/blob/6.3/ErrorRenderer/HtmlErrorRenderer.php#L307 which returns null in that case. When I dug deeper into the code, I found that this preg_replace_callback method errors out (preg_last_error_msg()) with the error: Backtrack limit exhausted and hence the type error is thrown.

How to reproduce

Not sure how to general reproduce the error, in my case it was a twig error, with a large context.

To reproduce this particular error, use Shopware, and create an invalid twig template, e.g. add for example a {{ at the end of this line (without closing): https://github.com/shopware/platform/blob/trunk/src/Storefront/Resources/views/storefront/base.html.twig#L15

In my case this produces an error text, with 6_547_276 characters.

Possible Solution

I tried to solve this error, by cutting the text or returning early, if the $text exceeds a particular length. But with these changes I do not give any response (the error message still shows up in the log though).

As far as I can tell, the regex does not match anything within the twig error text, as it is mostly the context of the twig templates, so I am not sure how to properly proceed, or where this should be fixed.

Additional Context

No response