[    1.872992] ip (242) used greatest stack depth: 12376 bytes left
[    2.502425] ip (276) used greatest stack depth: 12352 bytes left
[    9.652668] ip (786) used greatest stack depth: 12344 bytes left
[   12.085655] ip (1045) used greatest stack depth: 12328 bytes left
[  754.670677] blackhole_netdev_xmit(): Dropping skb.
[  754.670739] blackhole_netdev_xmit(): Dropping skb.
[  754.670769] blackhole_netdev_xmit(): Dropping skb.
[  754.670803] blackhole_netdev_xmit(): Dropping skb.
[ 1014.765027] blackhole_netdev_xmit(): Dropping skb.
[ 1014.765098] blackhole_netdev_xmit(): Dropping skb.
[ 1014.765142] blackhole_netdev_xmit(): Dropping skb.
[ 1014.765189] blackhole_netdev_xmit(): Dropping skb.
[ 1225.904042] blackhole_netdev_xmit(): Dropping skb.
[ 1225.904105] blackhole_netdev_xmit(): Dropping skb.
[ 1225.904139] blackhole_netdev_xmit(): Dropping skb.
[ 1225.904177] blackhole_netdev_xmit(): Dropping skb.