[    2.549579] ip (277) used greatest stack depth: 12320 bytes left
[  751.428115] blackhole_netdev_xmit(): Dropping skb.
[  751.428186] blackhole_netdev_xmit(): Dropping skb.
[  751.428239] blackhole_netdev_xmit(): Dropping skb.
[  751.428287] blackhole_netdev_xmit(): Dropping skb.
[  762.869276] blackhole_netdev_xmit(): Dropping skb.
[  762.869329] blackhole_netdev_xmit(): Dropping skb.
[  762.869360] blackhole_netdev_xmit(): Dropping skb.
[  762.869387] blackhole_netdev_xmit(): Dropping skb.
[  848.513897] blackhole_netdev_xmit(): Dropping skb.
[  848.513988] blackhole_netdev_xmit(): Dropping skb.
[  848.514044] blackhole_netdev_xmit(): Dropping skb.
[  848.514105] blackhole_netdev_xmit(): Dropping skb.
[  954.853163] ip (17752) used greatest stack depth: 12160 bytes left