Comment # 1 on bug 918376 from Bruno Pr�mont

This is expected behavior as systemd is "dead" when it crashed.

To reboot you should first remount filesystems read-only (eventually via
/proc/sysreq-trigger) and then reboot without help from init/systemd.

# umount filesystems
# or
echo u > /proc/sysreq-trigger

# reboot
reboot -f
# or
echo b > /proc/sysreq-trigger


When crashed systemd does not react to SIGTERM which should cause it to reexec
itself.