[    2.487513] ip (277) used greatest stack depth: 12360 bytes left
[    2.542394] ip (281) used greatest stack depth: 12352 bytes left
[    9.329285] ip (797) used greatest stack depth: 12344 bytes left
[   28.633517] ip (2494) used greatest stack depth: 12248 bytes left
[  975.975022] blackhole_netdev_xmit(): Dropping skb.
[  975.975100] blackhole_netdev_xmit(): Dropping skb.
[  975.975142] blackhole_netdev_xmit(): Dropping skb.
[  975.975199] blackhole_netdev_xmit(): Dropping skb.
[ 1252.017902] blackhole_netdev_xmit(): Dropping skb.
[ 1252.017977] blackhole_netdev_xmit(): Dropping skb.
[ 1252.018019] blackhole_netdev_xmit(): Dropping skb.
[ 1252.018061] blackhole_netdev_xmit(): Dropping skb.