[    1.795715] ip (243) used greatest stack depth: 12352 bytes left
[    2.404205] ip (277) used greatest stack depth: 12320 bytes left
[   24.502934] ip (2466) used greatest stack depth: 12304 bytes left
[  327.668115] ip (28023) used greatest stack depth: 12272 bytes left
[  835.265987] blackhole_netdev_xmit(): Dropping skb.
[  835.266041] blackhole_netdev_xmit(): Dropping skb.
[  835.266071] blackhole_netdev_xmit(): Dropping skb.
[  835.266097] blackhole_netdev_xmit(): Dropping skb.
[ 1028.187311] blackhole_netdev_xmit(): Dropping skb.
[ 1028.187371] blackhole_netdev_xmit(): Dropping skb.
[ 1028.187400] blackhole_netdev_xmit(): Dropping skb.
[ 1028.187434] blackhole_netdev_xmit(): Dropping skb.