[    1.709472] ip (241) used greatest stack depth: 12352 bytes left
[    2.192101] ip (275) used greatest stack depth: 12320 bytes left
[  636.865440] ip (12152) used greatest stack depth: 12304 bytes left
[ 1162.545698] blackhole_netdev_xmit(): Dropping skb.
[ 1162.545755] blackhole_netdev_xmit(): Dropping skb.
[ 1162.545786] blackhole_netdev_xmit(): Dropping skb.
[ 1162.545833] blackhole_netdev_xmit(): Dropping skb.
[ 1173.036854] blackhole_netdev_xmit(): Dropping skb.
[ 1173.036904] blackhole_netdev_xmit(): Dropping skb.
[ 1173.036934] blackhole_netdev_xmit(): Dropping skb.
[ 1173.036963] blackhole_netdev_xmit(): Dropping skb.