[    2.076537] ip (246) used greatest stack depth: 12328 bytes left
[   21.447237] ip (2130) used greatest stack depth: 12248 bytes left
[  982.249623] blackhole_netdev_xmit(): Dropping skb.
[  982.249696] blackhole_netdev_xmit(): Dropping skb.
[  982.249735] blackhole_netdev_xmit(): Dropping skb.
[  982.249774] blackhole_netdev_xmit(): Dropping skb.
[ 1242.021603] blackhole_netdev_xmit(): Dropping skb.
[ 1242.021662] blackhole_netdev_xmit(): Dropping skb.
[ 1242.021699] blackhole_netdev_xmit(): Dropping skb.
[ 1242.021728] blackhole_netdev_xmit(): Dropping skb.
[ 1250.721735] blackhole_netdev_xmit(): Dropping skb.
[ 1250.721789] blackhole_netdev_xmit(): Dropping skb.
[ 1250.721819] blackhole_netdev_xmit(): Dropping skb.
[ 1250.721846] blackhole_netdev_xmit(): Dropping skb.