/usr/share/php/Symfony/Bundle/TwigBundle/Resources/views/Exception/traces.xml.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 2 3 4 5 6 7 8 | <traces>
{% for trace in exception.trace %}
<trace>
{% include 'TwigBundle:Exception:trace.txt.twig' with { 'trace': trace } only %}
</trace>
{% endfor %}
</traces>
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