Computers Won't Turn Off or Reboot

Hey All,

I'm on r249745 on amd64. For the past few weeks, my box hasn't been able to
completely turn off or reboot. The box sits at the console at the "All
buffers synced" message. I'm running root on ZFS in a two-disk mirror
setup. No kernel panics or dumps or anything.

Let me know if there's anything I can do or more information  you need.

Thanks,

Shawn