[    2.548658] ip (282) used greatest stack depth: 12344 bytes left
[    2.596778] ip (286) used greatest stack depth: 12328 bytes left
[   28.394074] ip (2598) used greatest stack depth: 12312 bytes left
[ 1085.898970] blackhole_netdev_xmit(): Dropping skb.
[ 1085.899055] blackhole_netdev_xmit(): Dropping skb.
[ 1085.899093] blackhole_netdev_xmit(): Dropping skb.
[ 1085.899127] blackhole_netdev_xmit(): Dropping skb.