[    1.931583] ip (245) used greatest stack depth: 12384 bytes left
[    2.476225] ip (276) used greatest stack depth: 12368 bytes left
[    5.163901] ip (439) used greatest stack depth: 12352 bytes left
[  921.877146] blackhole_netdev_xmit(): Dropping skb.
[  921.877327] blackhole_netdev_xmit(): Dropping skb.
[  921.877391] blackhole_netdev_xmit(): Dropping skb.
[  921.877442] blackhole_netdev_xmit(): Dropping skb.
[  935.156957] blackhole_netdev_xmit(): Dropping skb.
[  935.157017] blackhole_netdev_xmit(): Dropping skb.
[  935.157051] blackhole_netdev_xmit(): Dropping skb.
[  935.157084] blackhole_netdev_xmit(): Dropping skb.
[  991.086031] blackhole_netdev_xmit(): Dropping skb.
[  991.086099] blackhole_netdev_xmit(): Dropping skb.
[  991.086132] blackhole_netdev_xmit(): Dropping skb.
[  991.086167] blackhole_netdev_xmit(): Dropping skb.
[ 1152.256744] blackhole_netdev_xmit(): Dropping skb.
[ 1152.256816] blackhole_netdev_xmit(): Dropping skb.
[ 1152.256853] blackhole_netdev_xmit(): Dropping skb.
[ 1152.256888] blackhole_netdev_xmit(): Dropping skb.