We're seeing in new relic some reports of the below when users are adding items to the cart:
E_ERROR: Allowed memory size of 2147483648 bytes exhausted (tried to allocate 24 bytes) in Varien_Simplexml_Element::descend called at /var/www/vhosts/www.domain.com/html/lib/Varien/Simplexml/Element.php (195) in Varien_Simplexml_Element::descend called at /var/www/vhosts/www.domain.com/html/lib/Varien/Simplexml/Config.php (153) in Varien_Simplexml_Config::getNode called at /var/www/vhosts/www.domain.com/html/app/code/local/Mage/Core/Model/Config.php (671) in Mage_Core_Model_Config::getNode called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Catalog/Helper/Data.php (298) in Mage_Catalog_Helper_Data::getOldFieldMap called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Catalog/Model/Product.php (129) in Mage_Catalog_Model_Product::_initOldFieldsMap called at /var/www/vhosts/www.domain.com/html/lib/Varien/Object.php (100) in Varien_Object::__construct called at /var/www/vhosts/www.domain.com/html/lib/Varien/Data/Collection.php (562) in Varien_Data_Collection::getNewEmptyItem called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php (406) in Mage_Catalog_Model_Resource_Product_Collection::getNewEmptyItem called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php (1053) in Mage_Eav_Model_Entity_Collection_Abstract::_loadEntities called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php (871) in Mage_Eav_Model_Entity_Collection_Abstract::load called at /var/www/vhosts/www.domain.com/html/lib/Varien/Data/Collection.php (741) in Varien_Data_Collection::getIterator called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php (1495) in Mage_Catalog_Model_Resource_Product_Collection::addOptionsToResult called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Resource/Quote/Item/Collection.php (182) in Mage_Sales_Model_Resource_Quote_Item_Collection::_assignProducts called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Resource/Quote/Item/Collection.php (139) in Mage_Sales_Model_Resource_Quote_Item_Collection::_afterLoad called at /var/www/vhosts/www.domain.com/html/lib/Varien/Data/Collection/Db.php (581) in Varien_Data_Collection_Db::load called at /var/www/vhosts/www.domain.com/html/lib/Varien/Data/Collection.php (741) in Varien_Data_Collection::getIterator called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Quote.php (1697) in Mage_Sales_Model_Quote::isVirtual called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Quote/Address.php (489) in Mage_Sales_Model_Quote_Address::getAllItems called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Quote/Address.php (541) in Mage_Sales_Model_Quote_Address::getAllNominalItems called at /var/www/vhosts/www.domain.com/html/app/code/core/Mage/Sales/Model/Quote/Address/Total/Nominal/RecurringAbstract.php (98)
Any ideas, please?
I have no idea what can be causing this and google is not turning up much!