[   13.879365] ip (1087) used greatest stack depth: 12072 bytes left
[  728.324221] blackhole_netdev_xmit(): Dropping skb.
[  728.324279] blackhole_netdev_xmit(): Dropping skb.
[  728.324311] blackhole_netdev_xmit(): Dropping skb.
[  728.324344] blackhole_netdev_xmit(): Dropping skb.
[ 1052.833344] blackhole_netdev_xmit(): Dropping skb.
[ 1052.833412] blackhole_netdev_xmit(): Dropping skb.
[ 1052.833444] blackhole_netdev_xmit(): Dropping skb.
[ 1052.833480] blackhole_netdev_xmit(): Dropping skb.
[ 1098.887231] blackhole_netdev_xmit(): Dropping skb.
[ 1098.887286] blackhole_netdev_xmit(): Dropping skb.
[ 1098.887319] blackhole_netdev_xmit(): Dropping skb.
[ 1098.887362] blackhole_netdev_xmit(): Dropping skb.