Reboot test log.
--- run 1 ---
shutdown -r now -> guest down, ~75s later back at login: prompt. No panic on serial console.
--- run 2 (log watched live via boot.log during shutdown) ---
System shutdown time has arrived -> clean reboot, no panic/fatal/devfs_uninit output on serial console.
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0 x86_64 (INVARIANTS).