[ 2.379615] ip (274) used greatest stack depth: 12320 bytes left [ 24.169250] ip (2497) used greatest stack depth: 12144 bytes left [ 881.988711] blackhole_netdev_xmit(): Dropping skb. [ 881.988769] blackhole_netdev_xmit(): Dropping skb. [ 881.988801] blackhole_netdev_xmit(): Dropping skb. [ 881.988835] blackhole_netdev_xmit(): Dropping skb.