[   21.994364] ip (2492) used greatest stack depth: 12272 bytes left
[  709.039569] blackhole_netdev_xmit(): Dropping skb.
[  709.039645] blackhole_netdev_xmit(): Dropping skb.
[  709.039692] blackhole_netdev_xmit(): Dropping skb.
[  709.039742] blackhole_netdev_xmit(): Dropping skb.
[  948.078527] blackhole_netdev_xmit(): Dropping skb.
[  948.078603] blackhole_netdev_xmit(): Dropping skb.
[  948.078649] blackhole_netdev_xmit(): Dropping skb.
[  948.078696] blackhole_netdev_xmit(): Dropping skb.
[ 1109.313477] blackhole_netdev_xmit(): Dropping skb.
[ 1109.313539] blackhole_netdev_xmit(): Dropping skb.
[ 1109.313575] blackhole_netdev_xmit(): Dropping skb.
[ 1109.313611] blackhole_netdev_xmit(): Dropping skb.
[ 1238.790752] blackhole_netdev_xmit(): Dropping skb.
[ 1238.790806] blackhole_netdev_xmit(): Dropping skb.
[ 1238.790837] blackhole_netdev_xmit(): Dropping skb.
[ 1238.790869] blackhole_netdev_xmit(): Dropping skb.