[    1.719467] ip (244) used greatest stack depth: 12352 bytes left
[    1.742452] ip (247) used greatest stack depth: 12304 bytes left
[    6.614495] ip (661) used greatest stack depth: 12272 bytes left
[  838.509783] blackhole_netdev_xmit(): Dropping skb.
[  838.509913] blackhole_netdev_xmit(): Dropping skb.
[  838.509950] blackhole_netdev_xmit(): Dropping skb.
[  838.509988] blackhole_netdev_xmit(): Dropping skb.
[ 1124.504473] blackhole_netdev_xmit(): Dropping skb.
[ 1124.504536] blackhole_netdev_xmit(): Dropping skb.
[ 1124.504573] blackhole_netdev_xmit(): Dropping skb.
[ 1124.504610] blackhole_netdev_xmit(): Dropping skb.