[    1.980666] ip (276) used greatest stack depth: 12320 bytes left
[    5.381768] ip (615) used greatest stack depth: 12304 bytes left
[   14.784432] ip (2149) used greatest stack depth: 12048 bytes left
[  856.293011] blackhole_netdev_xmit(): Dropping skb.
[  856.293078] blackhole_netdev_xmit(): Dropping skb.
[  856.293122] blackhole_netdev_xmit(): Dropping skb.
[  856.293160] blackhole_netdev_xmit(): Dropping skb.
[  867.338258] blackhole_netdev_xmit(): Dropping skb.
[  867.338324] blackhole_netdev_xmit(): Dropping skb.
[  867.338356] blackhole_netdev_xmit(): Dropping skb.
[  867.338394] blackhole_netdev_xmit(): Dropping skb.
[ 1010.788996] blackhole_netdev_xmit(): Dropping skb.
[ 1010.789066] blackhole_netdev_xmit(): Dropping skb.
[ 1010.789106] blackhole_netdev_xmit(): Dropping skb.
[ 1010.789148] blackhole_netdev_xmit(): Dropping skb.
[ 1126.157888] blackhole_netdev_xmit(): Dropping skb.
[ 1126.157953] blackhole_netdev_xmit(): Dropping skb.
[ 1126.157992] blackhole_netdev_xmit(): Dropping skb.
[ 1126.158038] blackhole_netdev_xmit(): Dropping skb.