[   22.815758] ip (2152) used greatest stack depth: 12192 bytes left
[  833.749638] blackhole_netdev_xmit(): Dropping skb.
[  833.749699] blackhole_netdev_xmit(): Dropping skb.
[  833.749727] blackhole_netdev_xmit(): Dropping skb.
[  833.749753] blackhole_netdev_xmit(): Dropping skb.
[ 1148.920372] blackhole_netdev_xmit(): Dropping skb.
[ 1148.920459] blackhole_netdev_xmit(): Dropping skb.
[ 1148.920507] blackhole_netdev_xmit(): Dropping skb.
[ 1148.920549] blackhole_netdev_xmit(): Dropping skb.