[    1.731893] ip (240) used greatest stack depth: 12832 bytes left
[    1.754234] ip (243) used greatest stack depth: 12592 bytes left
[    1.777937] ip (246) used greatest stack depth: 12304 bytes left
[    2.316426] ip (288) used greatest stack depth: 12272 bytes left
[    4.867180] ip (442) used greatest stack depth: 12176 bytes left
[ 1145.660123] blackhole_netdev_xmit(): Dropping skb.
[ 1145.660309] blackhole_netdev_xmit(): Dropping skb.
[ 1145.660350] blackhole_netdev_xmit(): Dropping skb.
[ 1145.660386] blackhole_netdev_xmit(): Dropping skb.
[ 1163.869857] blackhole_netdev_xmit(): Dropping skb.
[ 1163.869926] blackhole_netdev_xmit(): Dropping skb.
[ 1163.869968] blackhole_netdev_xmit(): Dropping skb.
[ 1163.870008] blackhole_netdev_xmit(): Dropping skb.