[    2.675002] ip (276) used greatest stack depth: 12344 bytes left
[    2.873729] ip (290) used greatest stack depth: 12328 bytes left
[   13.732962] ip (1143) used greatest stack depth: 12312 bytes left
[  690.221136] blackhole_netdev_xmit(): Dropping skb.
[  690.221195] blackhole_netdev_xmit(): Dropping skb.
[  690.221226] blackhole_netdev_xmit(): Dropping skb.
[  690.221253] blackhole_netdev_xmit(): Dropping skb.
[ 1241.126173] blackhole_netdev_xmit(): Dropping skb.
[ 1241.126245] blackhole_netdev_xmit(): Dropping skb.
[ 1241.126282] blackhole_netdev_xmit(): Dropping skb.
[ 1241.126316] blackhole_netdev_xmit(): Dropping skb.