[    1.753871] ip (242) used greatest stack depth: 12352 bytes left
[    2.238799] ip (276) used greatest stack depth: 12320 bytes left
[   21.844153] ip (2612) used greatest stack depth: 12272 bytes left
[  688.894587] blackhole_netdev_xmit(): Dropping skb.
[  688.894654] blackhole_netdev_xmit(): Dropping skb.
[  688.894693] blackhole_netdev_xmit(): Dropping skb.
[  688.894730] blackhole_netdev_xmit(): Dropping skb.
[  767.221808] blackhole_netdev_xmit(): Dropping skb.
[  767.221886] blackhole_netdev_xmit(): Dropping skb.
[  767.221941] blackhole_netdev_xmit(): Dropping skb.
[  767.221993] blackhole_netdev_xmit(): Dropping skb.
[  877.041171] blackhole_netdev_xmit(): Dropping skb.
[  877.041240] blackhole_netdev_xmit(): Dropping skb.
[  877.041274] blackhole_netdev_xmit(): Dropping skb.
[  877.041308] blackhole_netdev_xmit(): Dropping skb.
[ 1136.181288] blackhole_netdev_xmit(): Dropping skb.
[ 1136.181367] blackhole_netdev_xmit(): Dropping skb.
[ 1136.181409] blackhole_netdev_xmit(): Dropping skb.
[ 1136.181455] blackhole_netdev_xmit(): Dropping skb.