/usr/share/php/Symfony/Bundle/TwigBundle/Resources/views/Exception/exception.atom.twig is in php-symfony-twig-bundle 2.3.21+dfsg-4+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | {% include 'TwigBundle:Exception:exception.xml.twig' with { 'exception': exception } %}
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