[    1.986994] ip (241) used greatest stack depth: 12352 bytes left
[    2.567910] ip (275) used greatest stack depth: 12320 bytes left
[    5.233776] ip (411) used greatest stack depth: 12304 bytes left
[   14.356875] ip (1410) used greatest stack depth: 12160 bytes left
[   18.586153] ip (2149) used greatest stack depth: 12144 bytes left
[  725.725438] blackhole_netdev_xmit(): Dropping skb.
[  725.725526] blackhole_netdev_xmit(): Dropping skb.
[  725.725574] blackhole_netdev_xmit(): Dropping skb.
[  725.725621] blackhole_netdev_xmit(): Dropping skb.
[ 1115.394003] blackhole_netdev_xmit(): Dropping skb.
[ 1115.394081] blackhole_netdev_xmit(): Dropping skb.
[ 1115.394124] blackhole_netdev_xmit(): Dropping skb.
[ 1115.394163] blackhole_netdev_xmit(): Dropping skb.
[ 1142.113115] blackhole_netdev_xmit(): Dropping skb.
[ 1142.113187] blackhole_netdev_xmit(): Dropping skb.
[ 1142.113236] blackhole_netdev_xmit(): Dropping skb.
[ 1142.113295] blackhole_netdev_xmit(): Dropping skb.