[    2.502719] ip (274) used greatest stack depth: 12344 bytes left
[    8.139073] ip (744) used greatest stack depth: 12328 bytes left
[  638.088620] ip (1398) used greatest stack depth: 12296 bytes left
[  786.542148] blackhole_netdev_xmit(): Dropping skb.
[  786.542213] blackhole_netdev_xmit(): Dropping skb.
[  786.542256] blackhole_netdev_xmit(): Dropping skb.
[  786.542293] blackhole_netdev_xmit(): Dropping skb.
[ 1157.836165] blackhole_netdev_xmit(): Dropping skb.
[ 1157.836222] blackhole_netdev_xmit(): Dropping skb.
[ 1157.836253] blackhole_netdev_xmit(): Dropping skb.
[ 1157.836284] blackhole_netdev_xmit(): Dropping skb.
[ 1238.009970] blackhole_netdev_xmit(): Dropping skb.
[ 1238.010044] blackhole_netdev_xmit(): Dropping skb.
[ 1238.010093] blackhole_netdev_xmit(): Dropping skb.
[ 1238.010155] blackhole_netdev_xmit(): Dropping skb.