[    1.828574] ip (240) used greatest stack depth: 12832 bytes left
[    1.855556] ip (243) used greatest stack depth: 12376 bytes left
[    2.319922] ip (274) used greatest stack depth: 12344 bytes left
[  671.742106] blackhole_netdev_xmit(): Dropping skb.
[  671.742185] blackhole_netdev_xmit(): Dropping skb.
[  671.742239] blackhole_netdev_xmit(): Dropping skb.
[  671.742289] blackhole_netdev_xmit(): Dropping skb.
[  948.049782] ip (17806) used greatest stack depth: 12328 bytes left
[ 1080.390212] blackhole_netdev_xmit(): Dropping skb.
[ 1080.390290] blackhole_netdev_xmit(): Dropping skb.
[ 1080.390343] blackhole_netdev_xmit(): Dropping skb.
[ 1080.390386] blackhole_netdev_xmit(): Dropping skb.
[ 1159.588093] blackhole_netdev_xmit(): Dropping skb.
[ 1159.588160] blackhole_netdev_xmit(): Dropping skb.
[ 1159.588198] blackhole_netdev_xmit(): Dropping skb.
[ 1159.588245] blackhole_netdev_xmit(): Dropping skb.