[    1.657666] ip (241) used greatest stack depth: 12352 bytes left
[    2.110937] ip (275) used greatest stack depth: 12320 bytes left
[    6.695515] ip (662) used greatest stack depth: 12128 bytes left
[ 1065.676016] blackhole_netdev_xmit(): Dropping skb.
[ 1065.676091] blackhole_netdev_xmit(): Dropping skb.
[ 1065.676127] blackhole_netdev_xmit(): Dropping skb.
[ 1065.676163] blackhole_netdev_xmit(): Dropping skb.
[ 1080.142968] blackhole_netdev_xmit(): Dropping skb.
[ 1080.143037] blackhole_netdev_xmit(): Dropping skb.
[ 1080.143086] blackhole_netdev_xmit(): Dropping skb.
[ 1080.143132] blackhole_netdev_xmit(): Dropping skb.