Add a test case for kern/52771.


(jruoho)

# $NetBSD: t_repeated_updown.sh,v 1.1 2020/06/25 15:41:40 jruoho Exp $
#
# Copyright (c) 2020 The NetBSD Foundation, Inc.
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# This code is derived from software contributed to The NetBSD Foundation
# by Jukka Ruohonen.
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atf_test_case repeated_updown
repeated_updown_head() {
	atf_set "require.user" "root"
	atf_set "descr" "Test with ifconfig(8) that repeated " \
		"up/down does not cause a panic (PR kern/52771)"
}

repeated_updown_body() {

	# Try to avoid stalling any automated test runs.
	#
	n=35

	for i in $(ifconfig -l); do

		state="up"
		ifconfig -s $i

		if [ $? -eq 1 ]; then
			state="down"
			ifconfig $i up
			echo "Initialized $i up"
		fi

		while [ $n -gt 0 ]; do
			ifconfig $i down
			echo "Test $n: $i down"
			ifconfig $i up
			echo "Test $n: $i up"
			n=$(expr $n - 1)
		done

		ifconfig $i $state
		echo "Restored state of $i to $state"
		sleep 1
	done
}

atf_init_test_cases() {
	atf_add_test_case repeated_updown
}