syslog-ng python patterndb bug

python-bug-pattern.xml

<?xml version='1.0' encoding='UTF-8'?>
<patterndb version='4' pub_date='2017-09-21'>
    <ruleset name='python_template_test' id='fab7ae24-5a2b-43a9-9ad6-39bc6c82a15b'>
        <pattern>myprg</pattern>
        <rules>
            <rule id='ID:minimal_pattern' provider='user' class='CLS:minimal_pattern'>
                <patterns>
                    <pattern>Some test value: @ESTRING:some_test_value:.@</pattern>
                </patterns>
                <tags></tags>
                <values></values>
                <examples>
                    <example>
                        <test_message program='myprg'>Some test value: macilaci.</test_message>
                        <test_values>
                            <test_value name='some_test_value'>macilaci</test_value>
                        </test_values>
                    </example>
                </examples>
            </rule>
        </rules>
    </ruleset>
</patterndb>

python-bug-test-file

myprg Some test value: lacika.

python-bug.conf

python {
def this_is_where_the_segfault_happens(log_msg):
    return log_msg['some_test_value']
};

log {
    source { file("/etc/syslog-ng/conf.d/python-bug-test-file"); };
    parser { db-parser(file("/etc/syslog-ng/conf.d/python-bug-pattern.xml")); };
    destination { file("/dev/null" template("$(python this_is_where_the_segfault_happens)\n")); };
};