[    1.890047] ip (238) used greatest stack depth: 12376 bytes left
[    2.434120] ip (272) used greatest stack depth: 12344 bytes left
[    7.611538] ip (748) used greatest stack depth: 12328 bytes left
[   19.107544] ip (2214) used greatest stack depth: 12168 bytes left
[  788.185701] blackhole_netdev_xmit(): Dropping skb.
[  788.185784] blackhole_netdev_xmit(): Dropping skb.
[  788.185832] blackhole_netdev_xmit(): Dropping skb.
[  788.185872] blackhole_netdev_xmit(): Dropping skb.
[ 1225.382507] blackhole_netdev_xmit(): Dropping skb.
[ 1225.382592] blackhole_netdev_xmit(): Dropping skb.
[ 1225.382642] blackhole_netdev_xmit(): Dropping skb.
[ 1225.382694] blackhole_netdev_xmit(): Dropping skb.