symfony/symfony — comment on commit 8fc9547da5a5607e8a1a38a2c9d100d836937062
File: src/Symfony/Bundle/FrameworkBundle/EventListener/TestSessionListener.php line 54
By maomorales:

Hi Fabien, this seems to be causing a fatal error on unit tests, look:

PHP Fatal error: Uncaught exception 'ErrorException' with message 'Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown line 0' in vendor/symfony/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php:65
Stack trace:
#0 [internal function]: Symfony\Component\HttpKernel\Debug\ErrorHandler->handle(2, 'Unknown: Failed...', 'Unknown', 0, NULL)
#1 {main}
thrown in /srv/prod/web/fwupgrade/vendor/symfony/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php on line 65

If you replace session_id('') to session_id('x') it works