Hello, I regulary (3 times a month) met a fatal error (500) on immediate login with php_memory_limit set to 256 Mo. From /user/login page. I don't know how to reproduce this issue. But when I meet it, the issue persists until I make an action (or wait few days). **Sometime login return error 500 and requires 1Go of memory limit !** Meet with and without reddis, on apache and nginx, Drupal 11.4, PHP 8.4 and 8.5. **I could solve this issue**, setting : * Memory_limit to 1024Mo (!) (768Mo fails) * or disable flood ($config\['crowdsec.settings'\]\['plugins'\]\['flood'\]\['enable'\] = FALSE;, from settings.php since I can't login). ``` Here the backtrace : [24-Jul-2026 08:11:50 Europe/Paris] **PHP Fatal error**: Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) in web/core/lib/Drupal/Component/Serialization/PhpSerialize.php on line 21 Stack trace: #0 web/core/lib/Drupal/Component/Serialization/PhpSerialize.php(21): unserialize() #1 web/core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php(91): Drupal\Component\Serialization\PhpSerialize::decode() #2 web/core/lib/Drupal/Core/KeyValueStore/StorageBase.php(35): Drupal\Core\KeyValueStore\DatabaseStorage->getMultiple() #3 web/modules/contrib/crowdsec/src/Buffer.php(174): Drupal\Core\KeyValueStore\StorageBase->get() #4 web/modules/contrib/crowdsec/src/ScenarioPluginBase.php(86): **Drupal\crowdsec\Buffer->addSignal()** #5 web/modules/contrib/crowdsec/src/EventSubscriber/CrowdSec.php(77): Drupal\crowdsec\ScenarioPluginBase->addSignal() #6 vendor/symfony/event-dispatcher/EventDispatcher.php(246): Drupal\crowdsec\EventSubscriber\CrowdSec->onBlockIp() #7 vendor/symfony/event-dispatcher/EventDispatcher.php(206): Symfony\Component\EventDispatcher\EventDispatcher::{closure:Symfony\Component\EventDispatcher\EventDispatcher::optimizeListeners():241}() #8 vendor/symfony/event-dispatcher/EventDispatcher.php(56): Symfony\Component\EventDispatcher\EventDispatcher->callListeners() #9 web/core/modules/user/src/UserFloodControl.php(72): Symfony\Component\EventDispatcher\EventDispatcher->dispatch() #10 web/core/modules/user/src/Form/UserLoginForm.php(219): Drupal\user\UserFloodControl->isAllowed() #11 web/core/lib/Drupal/Core/Form/FormValidator.php(87): Drupal\user\Form\UserLoginForm->validateAuthentication() #12 web/core/lib/Drupal/Core/Form/FormValidator.php(280): Drupal\Core\Form\FormValidator->executeValidateHandlers() #13 web/core/lib/Drupal/Core/Form/FormValidator.php(123): Drupal\Core\Form\FormValidator->doValidateForm() #14 web/core/lib/Drupal/Core/Form/FormBuilder.php(616): Drupal\Core\Form\FormValidator->validateForm() #15 web/core/lib/Drupal/Core/Form/FormBuilder.php(343): Drupal\Core\Form\FormBuilder->processForm() #16 web/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\Core\Form\FormBuilder->buildForm() #17 [internal function]: Drupal\Core\Controller\FormController->getContentResult() #18 web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array() #19 web/core/lib/Drupal/Core/Render/Renderer.php(638): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::wrapControllerExecutionInRenderContext():121}() #20 [internal function]: Drupal\Core\Render\Renderer::{closure:Drupal\Core\Render\Renderer::executeInRenderContext():638}() #21 web/core/lib/Drupal/Core/Render/Renderer.php(653): Fiber->resume() #22 web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(121): Drupal\Core\Render\Renderer->executeInRenderContext() #23 web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() #24 vendor/symfony/http-kernel/HttpKernel.php(183): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::onController():96}() #25 vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw() #26 web/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle() #27 web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(30): Drupal\Core\StackMiddleware\Session->handle() #28 web/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle() #29 web/core/modules/big_pipe/src/StackMiddleware/ContentLength.php(32): Drupal\Core\StackMiddleware\ContentLength->handle() #30 web/core/modules/page_cache/src/StackMiddleware/PageCache.php(118): Drupal\big_pipe\StackMiddleware\ContentLength->handle() #31 web/core/modules/page_cache/src/StackMiddleware/PageCache.php(92): Drupal\page_cache\StackMiddleware\PageCache->pass() #32 web/modules/contrib/crowdsec/src/Middleware.php(62): Drupal\page_cache\StackMiddleware\PageCache->handle() #33 web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\crowdsec\Middleware->handle() #34 web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() #35 web/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(61): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() #36 web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(54): Drupal\Core\StackMiddleware\AjaxPageState->handle() #37 web/core/lib/Drupal/Core/DrupalKernel.php(753): Drupal\Core\StackMiddleware\StackedHttpKernel->handle() #38 vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php(34): Drupal\Core\DrupalKernel->handle() #39 vendor/autoload_runtime.php(32): Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run() #40 web/autoload_runtime.php(22): require('...') #41 web/index.php(13): require_once('...') #42 {main} ```