On Tue, Mar 13, 2007 at 09:50:10PM +0200, Mark Ter Morshuizen wrote:
> db> bt
> cpu_Debugger() at netbsd:cpu_Debugger+0x4
> panic() at netbsd:panic+0x1f8
> trap() at netbsd:trap+0x120
> XentUna() at netbsd:XentUna+0x20
> --- unaligned access fault (from ipl 1) ---
> tcp_sack_option() at netbsd:tcp_sack_option+0x13c
> tcp_dooptions() at netbsd:tcp_dooptions+0x278
> tcp_input() at netbsd:tcp_input+0xa20
> ip_input() at netbsd:ip_input+0xb34
> ipintr() at netbsd:ipintr+0xa0
> netintr() at netbsd:netintr+0xb8
> softintr_dispatch() at netbsd:softintr_dispatch+0x160
> exception_return() at netbsd:exception_return+0x7c
> --- root of call graph ---

This has been fixed, iirc. I suggest you to update the kernel.

Pavel