[    2.121585] ip (276) used greatest stack depth: 12320 bytes left
[   12.000117] ip (1357) used greatest stack depth: 12304 bytes left
[   20.378492] ip (2496) used greatest stack depth: 12272 bytes left
[ 1141.168232] blackhole_netdev_xmit(): Dropping skb.
[ 1141.168296] blackhole_netdev_xmit(): Dropping skb.
[ 1141.168329] blackhole_netdev_xmit(): Dropping skb.
[ 1141.168365] blackhole_netdev_xmit(): Dropping skb.
[ 1238.150867] blackhole_netdev_xmit(): Dropping skb.
[ 1238.150929] blackhole_netdev_xmit(): Dropping skb.
[ 1238.150965] blackhole_netdev_xmit(): Dropping skb.
[ 1238.151018] blackhole_netdev_xmit(): Dropping skb.