[    1.893340] ip (244) used greatest stack depth: 12352 bytes left
[    2.464426] ip (275) used greatest stack depth: 12320 bytes left
[    2.674130] ip (289) used greatest stack depth: 12032 bytes left
[  859.256264] blackhole_netdev_xmit(): Dropping skb.
[  859.256338] blackhole_netdev_xmit(): Dropping skb.
[  859.256376] blackhole_netdev_xmit(): Dropping skb.
[  859.256416] blackhole_netdev_xmit(): Dropping skb.
[ 1085.067062] blackhole_netdev_xmit(): Dropping skb.
[ 1085.067132] blackhole_netdev_xmit(): Dropping skb.
[ 1085.067179] blackhole_netdev_xmit(): Dropping skb.
[ 1085.067223] blackhole_netdev_xmit(): Dropping skb.
[ 1091.442015] blackhole_netdev_xmit(): Dropping skb.
[ 1091.442064] blackhole_netdev_xmit(): Dropping skb.
[ 1091.442092] blackhole_netdev_xmit(): Dropping skb.
[ 1091.442117] blackhole_netdev_xmit(): Dropping skb.