Bug#923889: google-compute-image-packages - DoS via serial console write
This package instructs journald to duplicate everything sent to the
journal to the serial console. The serial console is a pretty rate
limited log output device and blocking there will make all software with
any log output block.
We have found all life forms in the galaxy are capable of superior
-- Kirk, "The Gamesters of Triskelion", stardate 3211.7