bug: "Warning: require_once(): Unable to allocate memory for pool" (3 replies)

I got this error msg when browsing the piwik console, every page is like this. rebooting httpd/apache2 fixes this temporarily.

a full pdf printout of the error page is attached. below is a shorter excerpt of the msg


############################################################

There is an error. Please report the message (Piwik 2.4.1) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Warning: require_once(): Unable to allocate memory for pool. in /var/www/html/piwik/core/Loader.php on line 98

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [/var/www/html/piwik/core/Loader.php:98]
#1 Piwik\Loader::tryToLoadClass(...) called at [/var/www/html/piwik/core/Loader.php:98]
#2 Piwik\Loader::tryToLoadClass(...) called at [/var/www/html/piwik/core/Loader.php:84]
#3 Piwik\Loader::loadClass(...) called at [/var/www/html/piwik/core/Loader.php:114]
#4 Piwik\Loader::autoload(...) called at [:]
#5 spl_autoload_call(...) called at [/var/www/html/piwik/core/Singleton.php:37]
#6 Piwik\Singleton::getInstance(...) called at [/var/www/html/piwik/plugins/Events/Widgets.php:19]
#7 Piwik\Plugins\Events\Widgets->configure(...) called at [/var/www/html/piwik/core/WidgetsList.php:87]
#8 Piwik\WidgetsList::addWidgets(...) called at [/var/www/html/piwik/core/WidgetsList.php:57]
#9 Piwik\WidgetsList::get(...) called at [/var/www/html/piwik/plugins/Dashboard/Controller.php:42]
#10 Piwik\Plugins\Dashboard\Controller->_getDashboardView(...) called at [/var/www/html/piwik/plugins/Dashboard/Controller.php:56]
#11 Piwik\Plugins\Dashboard\Controller->embeddedIndex(...) called at [:]
#12 call_user_func_array(...) called at [/var/www/html/piwik/core/FrontController.php:531]
#13 Piwik\FrontController->doDispatch(...) called at [/var/www/html/piwik/core/FrontController.php:84]
#14 Piwik\FrontController->dispatch(...) called at [/var/www/html/piwik/core/dispatch.php:34]
#15 require_once(...) called at [/var/www/html/piwik/index.php:47]