In the parent task, we have a timeout in PHP-FPM, but debugging is hard without a stacktrace.
We used to have these logs in `/var/log/mediawiki/debuglogs`, but I have [[ https://github.com/miraheze/puppet/commit/129035eed468e063c3b0f78e153f395d3fea3302#diff-020f803ae7cff3dd88f248e3aa9d0e67a2dd6584d44f7e09705b28571133bab1L60-L61 | removed ]] them because PHP-FPM does not log these to syslog.