[    1.874664] ip (240) used greatest stack depth: 12616 bytes left
[    2.445569] ip (274) used greatest stack depth: 12344 bytes left
[   24.342033] ip (2459) used greatest stack depth: 12328 bytes left
[  640.631674] ip (10432) used greatest stack depth: 12296 bytes left
[  826.319788] blackhole_netdev_xmit(): Dropping skb.
[  826.319847] blackhole_netdev_xmit(): Dropping skb.
[  826.319883] blackhole_netdev_xmit(): Dropping skb.
[  826.319931] blackhole_netdev_xmit(): Dropping skb.
[  843.561403] blackhole_netdev_xmit(): Dropping skb.
[  843.561455] blackhole_netdev_xmit(): Dropping skb.
[  843.561490] blackhole_netdev_xmit(): Dropping skb.
[  843.561523] blackhole_netdev_xmit(): Dropping skb.