[    1.765225] ip (240) used greatest stack depth: 12376 bytes left
[    2.256895] ip (274) used greatest stack depth: 12344 bytes left
[  644.389645] ip (5669) used greatest stack depth: 12328 bytes left
[  711.517222] blackhole_netdev_xmit(): Dropping skb.
[  711.517282] blackhole_netdev_xmit(): Dropping skb.
[  711.517317] blackhole_netdev_xmit(): Dropping skb.
[  711.517357] blackhole_netdev_xmit(): Dropping skb.
[  718.867650] blackhole_netdev_xmit(): Dropping skb.
[  718.867720] blackhole_netdev_xmit(): Dropping skb.
[  718.867767] blackhole_netdev_xmit(): Dropping skb.
[  718.867807] blackhole_netdev_xmit(): Dropping skb.
[  725.574413] blackhole_netdev_xmit(): Dropping skb.
[  725.574463] blackhole_netdev_xmit(): Dropping skb.
[  725.574497] blackhole_netdev_xmit(): Dropping skb.
[  725.574526] blackhole_netdev_xmit(): Dropping skb.
[ 1147.576056] blackhole_netdev_xmit(): Dropping skb.
[ 1147.576138] blackhole_netdev_xmit(): Dropping skb.
[ 1147.576195] blackhole_netdev_xmit(): Dropping skb.
[ 1147.576257] blackhole_netdev_xmit(): Dropping skb.