[    2.355057] ip (277) used greatest stack depth: 12352 bytes left
[  907.726558] blackhole_netdev_xmit(): Dropping skb.
[  907.726622] blackhole_netdev_xmit(): Dropping skb.
[  907.726656] blackhole_netdev_xmit(): Dropping skb.
[  907.726689] blackhole_netdev_xmit(): Dropping skb.
[  933.291091] blackhole_netdev_xmit(): Dropping skb.
[  933.291145] blackhole_netdev_xmit(): Dropping skb.
[  933.291180] blackhole_netdev_xmit(): Dropping skb.
[  933.291208] blackhole_netdev_xmit(): Dropping skb.