I'm gravely sorry to annoy. I've googled for a little while and found out that IPSec panics are a known issue on amd64. Is it still so? I was surprised that setkey -D causes panic and a memory dump on my 6-Stable box. Come on, it's _FreeBSD_ for crying out loud. We can't live with that. I'm willing to help debugging this nasty thing if help's needed.