[    1.802029] ip (242) used greatest stack depth: 12352 bytes left
[    2.252461] ip (276) used greatest stack depth: 12320 bytes left
[    9.059617] ip (961) used greatest stack depth: 12272 bytes left
[  980.202608] blackhole_netdev_xmit(): Dropping skb.
[  980.202673] blackhole_netdev_xmit(): Dropping skb.
[  980.202704] blackhole_netdev_xmit(): Dropping skb.
[  980.202730] blackhole_netdev_xmit(): Dropping skb.
[ 1132.074875] blackhole_netdev_xmit(): Dropping skb.
[ 1132.074921] blackhole_netdev_xmit(): Dropping skb.
[ 1132.074956] blackhole_netdev_xmit(): Dropping skb.
[ 1132.074985] blackhole_netdev_xmit(): Dropping skb.
[ 1176.196361] blackhole_netdev_xmit(): Dropping skb.
[ 1176.196418] blackhole_netdev_xmit(): Dropping skb.
[ 1176.196454] blackhole_netdev_xmit(): Dropping skb.
[ 1176.196490] blackhole_netdev_xmit(): Dropping skb.