#!/bin/sh
# DF-3450: race kldunload ip_mrace against in-flight encap4_input dispatch.
# ip_mroute MOD_UNLOAD NULLs the ipip_input hook under mroute_token -- but
# encap4_input() reads/calls it with no token and the unload path performs
# no netisr drain -- so the call can land in module text that the linker
# has already unmapped.
KMOD=/usr/obj/usr/src/sys/net/ip_mroute/ip_mroute.ko
i=0
while :; do
	kldload $KMOD 2>/dev/null
	kldunload ip_mroute 2>/dev/null
	i=$((i+1))
	if [ $((i % 50)) -eq 0 ]; then
		echo "racer: $i load/unload cycles"
	fi
done