[    1.766746] ip (241) used greatest stack depth: 12352 bytes left
[    2.158236] ip (275) used greatest stack depth: 12320 bytes left
[    8.529707] ip (917) used greatest stack depth: 12304 bytes left
[    9.077529] ip (959) used greatest stack depth: 12272 bytes left
[  949.541259] blackhole_netdev_xmit(): Dropping skb.
[  949.541324] blackhole_netdev_xmit(): Dropping skb.
[  949.541361] blackhole_netdev_xmit(): Dropping skb.
[  949.541400] blackhole_netdev_xmit(): Dropping skb.
[ 1131.240093] blackhole_netdev_xmit(): Dropping skb.
[ 1131.240144] blackhole_netdev_xmit(): Dropping skb.
[ 1131.240176] blackhole_netdev_xmit(): Dropping skb.
[ 1131.240202] blackhole_netdev_xmit(): Dropping skb.