On 8/1/23 6:43 PM, thinker.li@gmail.com wrote:
\> @@ -747,6 +750,97 @@ fib_notify_test()

 	cleanup &> /dev/null
 }
 
+fib6_gc_test()
+{
+	echo
+	echo "Fib6 garbage collection test"
+
+	STRACE=$(which strace)
+	if [ -z "$STRACE" ]; then
+	    echo "    SKIP: strace not found"
+	    ret=$ksft_skip
+	    return
+	fi
+
+	EXPIRE=10
+
+	setup
+
+	set -e
+
+	# Check expiration of routes every 3 seconds (GC)
+	$NS_EXEC sysctl -wq net.ipv6.route.gc_interval=300
+
+	$IP link add dummy_10 type dummy
+	$IP link set dev dummy_10 up
+	$IP -6 address add 2001:10::1/64 dev dummy_10
+
+	$NS_EXEC sysctl -wq net.ipv6.route.flush=1
+
+	# Temporary routes
+	for i in $(seq 1 1000); do
+	    # Expire route after $EXPIRE seconds
+	    $IP -6 route add 2001:20::$i \
+		via 2001:10::2 dev dummy_10 expires $EXPIRE
+	done
+	N_EXP=$($IP -6 route list |grep expires|wc -l)
+	if [ $N_EXP -ne 1000 ]; then

race condition here ... that you can install all 1000 routes and then
run this command before any expire. 10 seconds is normally more than
enough time, but on a loaded server it might not be. And really it does
not matter. What matters is that you install routes with an expires and
they disappear when expected - and I believe the flush below should not
be needed to validate they have been removed.