Maximum call stack size reached. Infinite recursion?

Is xdebug enabled? I remember there were issues with that, although this of course may be unrelated.

Yes, Xdebug is enabled.

Oh and might be worth mentioning, the user.permissions cache context is attached to the role entity, which at some point is added as cacheable dependency.

MR should be updated for 11.x

Nothing major stuck out but definitely seems like something that will need test coverage

@Dieter
I debugged a similar thing lately, it looks like the new permission negitiation code is not robust against some config override cacheability.
Can you grep "implements ConfigFactoryOverrideInterface" modules?

That's it! The following class in my custom code seems to be the culprit. I don't think I'm doing anything wrong there though?

<?php

namespace Drupal\my_module\Config;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Config\ConfigFactoryOverrideInterface;
use Drupal\Core\Config\StorageInterface;
use Drupal\Core\Session\AccountProxyInterface;

class MenuBreadcrumbConfigOverrides implements ConfigFactoryOverrideInterface
{
    public function __construct(
        protected AccountProxyInterface $currentUser,
    ) {
    }

    public function loadOverrides($names): array
    {
        $overrides = [];

        if (!in_array('menu_breadcrumb.settings', $names, true)) {
            return $overrides;
        }

        if ($this->currentUser->hasPermission('access toolbar')) {
            if ($this->currentUser->hasPermission('access editor toolbar')) {
                $overrides['menu_breadcrumb.settings']['menu_breadcrumb_menus']['editor']['enabled'] = 1;
            } else {
                $overrides['menu_breadcrumb.settings']['menu_breadcrumb_menus']['admin']['enabled'] = 1;
            }
        }

        return $overrides;
    }

    public function getCacheSuffix(): string
    {
        return 'MenuBreadcrumbConfigOverrides';
    }

    public function getCacheableMetadata($name): CacheableMetadata
    {
        return (new CacheableMetadata())
            ->addCacheContexts(['user.permissions']);
    }

    public function createConfigObject($name, $collection = StorageInterface::DEFAULT_COLLECTION)
    {
        return null;
    }
}

Yo! I made the same omission in translation_bliss module, now fixed:
You need a $name check in getCacheableMetadata.

That said, imho it's still a core bug if it WSODs on too much config cachability.

You're right, that fixes it for me. Thanks!