[    2.713641] ip (274) used greatest stack depth: 12344 bytes left
[    4.743079] ip (407) used greatest stack depth: 12328 bytes left
[  632.432697] ip (2116) used greatest stack depth: 12184 bytes left
[  909.540758] blackhole_netdev_xmit(): Dropping skb.
[  909.540826] blackhole_netdev_xmit(): Dropping skb.
[  909.540861] blackhole_netdev_xmit(): Dropping skb.
[  909.540892] blackhole_netdev_xmit(): Dropping skb.
[ 1207.277865] blackhole_netdev_xmit(): Dropping skb.
[ 1207.277927] blackhole_netdev_xmit(): Dropping skb.
[ 1207.277961] blackhole_netdev_xmit(): Dropping skb.
[ 1207.277998] blackhole_netdev_xmit(): Dropping skb.