[    1.947626] ip (244) used greatest stack depth: 12352 bytes left
[    2.369225] ip (275) used greatest stack depth: 12320 bytes left
[  628.560395] ip (983) used greatest stack depth: 12160 bytes left
[  889.755020] blackhole_netdev_xmit(): Dropping skb.
[  889.755081] blackhole_netdev_xmit(): Dropping skb.
[  889.755118] blackhole_netdev_xmit(): Dropping skb.
[  889.755159] blackhole_netdev_xmit(): Dropping skb.
[ 1205.356081] blackhole_netdev_xmit(): Dropping skb.
[ 1205.356173] blackhole_netdev_xmit(): Dropping skb.
[ 1205.356215] blackhole_netdev_xmit(): Dropping skb.
[ 1205.356266] blackhole_netdev_xmit(): Dropping skb.