[    1.686533] ip (241) used greatest stack depth: 12832 bytes left
[    1.709204] ip (244) used greatest stack depth: 12352 bytes left
[    1.731898] ip (247) used greatest stack depth: 12304 bytes left
[ 1194.803498] blackhole_netdev_xmit(): Dropping skb.
[ 1194.803565] blackhole_netdev_xmit(): Dropping skb.
[ 1194.803599] blackhole_netdev_xmit(): Dropping skb.
[ 1194.803632] blackhole_netdev_xmit(): Dropping skb.