100% CPU load and mem usage with render and unexisting service access

[valeriangalliat]

I ran into this problem while I had a typo in a service class name; when trying to load a page that renders another action accessing this service, the CPU load and mem usage of my computer started to increase until saturation.

I could reproduce this on a fresh Symfony 2.7 installation with very few lines of code.

I'm using the built-in development server app/console server:run (this bug doesn't happen with Apache); here's the verbose output:

Server running on http://127.0.0.1:8000

Quit the server with CONTROL-C.
  RUN  '/usr/bin/php5' '-S' '127.0.0.1:8000' '/home/hap/public_html/symfo/test2/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/router_dev.php'
  RES  137 Command did not run successfully
Built-in server terminated unexpectedly

Here's a capture of htop while loading /app/example:

I'm running Debian Wheezy, x86_64, and PHP is 5.4.36.

Is there anything I can do to help targeting more precisely this bug?

[cordoval]

@valeriangalliat

[Fri Apr  3 01:27:35 2015] PHP Fatal error:  Class 'AppBundle\Troll' not found in /Users/cordoval/Sites/symfony-standard/app/cache/dev/appDevDebugProjectContainer.php on line 2934
[Fri Apr  3 01:27:35 2015] ::1:56798 [500]: /app_dev.php/app/example - Class 'AppBundle\Troll' not found in /Users/cordoval/Sites/symfony-standard/app/cache/dev/appDevDebugProjectContainer.php on line 2934
[Fri Apr  3 01:27:35 2015] ::1:56799 [200]: /bundles/framework/css/structure.css
[Fri Apr  3 01:27:35 2015] ::1:56800 [200]: /bundles/framework/css/body.css
[Fri Apr  3 01:27:35 2015] ::1:56801 [200]: /bundles/framework/css/exception.css
[Fri Apr  3 01:27:35 2015] PHP Deprecated:  The Symfony\Component\Security\Core\SecurityContextInterface interface is deprecated since version 2.6 and will be removed in 3.0. in /Users/cordoval/Sites/symfony-standard/app/cache/dev/classes.php on line 2565
[Fri Apr  3 01:27:35 2015] PHP Deprecated:  The Symfony\Component\Security\Core\SecurityContext class is deprecated since version 2.6 and will be removed in 3.0. Use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage or Symfony\Component\Security\Core\Authorization\AuthorizationChecker instead. in /Users/cordoval/Sites/symfony-standard/app/cache/dev/classes.php on line 2577
[Fri Apr  3 01:27:39 2015] PHP Fatal error:  Allowed memory size of 2147483648 bytes exhausted (tried to allocate 32 bytes) in /Users/cordoval/Sites/symfony-standard/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php on line 40
[Fri Apr  3 01:27:39 2015] ::1:56802 [500]: /app_dev.php/_wdt/13c56b - Allowed memory size of 2147483648 bytes exhausted (tried to allocate 32 bytes) in /Users/cordoval/Sites/symfony-standard/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php on line 40

i also get an error on the page showing the first error which is your class Troll does not exist or is missing an use statement. The memory leaks after that error has happened. I believe the ClassNotFoundFatalErrorHandler starts the leak since it builds up a huge array of classes of all the autoloaders. Then after that comes the datacollector which is going to use the memory that finally exhausts it. Did you try to investigate where the leak happens and what can be done about it @valeriangalliat ? 👴

[valeriangalliat]

Thanks for your answer @cordoval. I didn't took the time to investigate further with this bug yet. However I just tried again with the exact same project I captured the first screenshot with (vendors were not updated, code was not changed) but I cannot reproduce anymore.

Since the last time I just upgraded PHP to 5.4.39. I tried to compile 5.4.36 again but I still can't reproduce. Really odd.

[jakzal]

Feel free to reopen if you manage to reproduce this problem again. I've just tried your example and it works as expected (shows an error class is not found).