[    2.355720] ip (246) used greatest stack depth: 12376 bytes left
[    2.928164] ip (277) used greatest stack depth: 12344 bytes left
[  649.578200] ip (20159) used greatest stack depth: 12328 bytes left
[  754.312120] blackhole_netdev_xmit(): Dropping skb.
[  754.312208] blackhole_netdev_xmit(): Dropping skb.
[  754.312255] blackhole_netdev_xmit(): Dropping skb.
[  754.312310] blackhole_netdev_xmit(): Dropping skb.
[  778.996555] blackhole_netdev_xmit(): Dropping skb.
[  778.996622] blackhole_netdev_xmit(): Dropping skb.
[  778.996660] blackhole_netdev_xmit(): Dropping skb.
[  778.996696] blackhole_netdev_xmit(): Dropping skb.