[    2.526835] ip (280) used greatest stack depth: 12360 bytes left
[    2.713545] ip (294) used greatest stack depth: 12344 bytes left
[   22.825108] ip (2224) used greatest stack depth: 12192 bytes left
[  885.080040] blackhole_netdev_xmit(): Dropping skb.
[  885.080211] blackhole_netdev_xmit(): Dropping skb.
[  885.080252] blackhole_netdev_xmit(): Dropping skb.
[  885.080301] blackhole_netdev_xmit(): Dropping skb.
[  907.044342] blackhole_netdev_xmit(): Dropping skb.
[  907.044399] blackhole_netdev_xmit(): Dropping skb.
[  907.044432] blackhole_netdev_xmit(): Dropping skb.
[  907.044467] blackhole_netdev_xmit(): Dropping skb.