[    2.335376] ip (276) used greatest stack depth: 12352 bytes left
[    7.976339] ip (662) used greatest stack depth: 12312 bytes left
[  856.208887] blackhole_netdev_xmit(): Dropping skb.
[  856.208968] blackhole_netdev_xmit(): Dropping skb.
[  856.209014] blackhole_netdev_xmit(): Dropping skb.
[  856.209055] blackhole_netdev_xmit(): Dropping skb.
[ 1249.500578] blackhole_netdev_xmit(): Dropping skb.
[ 1249.500647] blackhole_netdev_xmit(): Dropping skb.
[ 1249.500678] blackhole_netdev_xmit(): Dropping skb.
[ 1249.500709] blackhole_netdev_xmit(): Dropping skb.