[    1.736136] ip (243) used greatest stack depth: 12352 bytes left
[    2.197534] ip (277) used greatest stack depth: 12320 bytes left
[   19.937499] ip (2340) used greatest stack depth: 12304 bytes left
[  628.882930] ip (16019) used greatest stack depth: 12048 bytes left
[  681.029887] blackhole_netdev_xmit(): Dropping skb.
[  681.029944] blackhole_netdev_xmit(): Dropping skb.
[  681.029978] blackhole_netdev_xmit(): Dropping skb.
[  681.030012] blackhole_netdev_xmit(): Dropping skb.
[  752.989637] blackhole_netdev_xmit(): Dropping skb.
[  752.989696] blackhole_netdev_xmit(): Dropping skb.
[  752.989738] blackhole_netdev_xmit(): Dropping skb.
[  752.989791] blackhole_netdev_xmit(): Dropping skb.
[ 1162.326008] blackhole_netdev_xmit(): Dropping skb.
[ 1162.326090] blackhole_netdev_xmit(): Dropping skb.
[ 1162.326138] blackhole_netdev_xmit(): Dropping skb.
[ 1162.326173] blackhole_netdev_xmit(): Dropping skb.
[ 1181.311689] blackhole_netdev_xmit(): Dropping skb.
[ 1181.311744] blackhole_netdev_xmit(): Dropping skb.
[ 1181.311781] blackhole_netdev_xmit(): Dropping skb.
[ 1181.311815] blackhole_netdev_xmit(): Dropping skb.