8c5d766cd7
I tried re-ordering ether_ifdetach(), but this created a new race where sometimes, when under heavy receive load (>1Mpps) and running tcpdump, the machine would panic. At panic, the ithread was still in the original (not dead) if_input() path, and was accessing stale BPF data structs. By using a dying flag, I can close the interface prior to if_detach() to be certain the interface cannot send packets up in the middle of ether_ifdetach.