some weird corruption in net-2.6.24

Every so often some piece of userland dies, and often it's
bad enough that my desktop session logs out.

I've been trying to find some clues and it seems to happen
about as often as openswan rekeys my VPN, so one suspect
area is the netlink cleanups to xfrm_user.

I plan to do some auditing of those changes looking for
errors, but if someone can beat me to it... :-)