[    2.345782] ip (280) used greatest stack depth: 12360 bytes left
[    2.393420] ip (284) used greatest stack depth: 12344 bytes left
[    7.546744] ip (652) used greatest stack depth: 12192 bytes left
[ 1124.751793] blackhole_netdev_xmit(): Dropping skb.
[ 1124.751869] blackhole_netdev_xmit(): Dropping skb.
[ 1124.751906] blackhole_netdev_xmit(): Dropping skb.
[ 1124.751944] blackhole_netdev_xmit(): Dropping skb.
[ 1216.023671] blackhole_netdev_xmit(): Dropping skb.
[ 1216.023726] blackhole_netdev_xmit(): Dropping skb.
[ 1216.023770] blackhole_netdev_xmit(): Dropping skb.
[ 1216.023807] blackhole_netdev_xmit(): Dropping skb.