MBR zapped when panicking?

[Tilman Linneweh]

* Dimitry Andric [Di, 21 Okt 2003 at 20:19 GMT]:
> 
> Today I had a -CURRENT machine panic on me with a page fault, and
> something happened that I have seen before: the machine refused to
> come up afterwards. Closer inspection revealed that the MBR on the
> boot disk was totally zapped, filled with seemingly random characters.
> Luckily the disk label was still intact, allowing me to recover the
> machine reasonably easy. The MBRs on the other disks (see attached
> dmesg.txt for more info) wasn't touched by the panic.

Same happened to me last week,
It is a known problem, see 3. point on 
http://www.freebsd.org/releases/5.2R/todo.html

regards
tilman