[    1.817834] ip (242) used greatest stack depth: 12352 bytes left
[    2.245031] ip (273) used greatest stack depth: 12320 bytes left
[    4.345262] ip (406) used greatest stack depth: 12304 bytes left
[    7.454429] ip (781) used greatest stack depth: 12224 bytes left
[  638.084891] ip (16765) used greatest stack depth: 12128 bytes left
[  651.273400] blackhole_netdev_xmit(): Dropping skb.
[  651.273459] blackhole_netdev_xmit(): Dropping skb.
[  651.273496] blackhole_netdev_xmit(): Dropping skb.
[  651.273531] blackhole_netdev_xmit(): Dropping skb.
[  901.441314] blackhole_netdev_xmit(): Dropping skb.
[  901.441366] blackhole_netdev_xmit(): Dropping skb.
[  901.441396] blackhole_netdev_xmit(): Dropping skb.
[  901.441424] blackhole_netdev_xmit(): Dropping skb.
[ 1157.023553] blackhole_netdev_xmit(): Dropping skb.
[ 1157.023610] blackhole_netdev_xmit(): Dropping skb.
[ 1157.023643] blackhole_netdev_xmit(): Dropping skb.
[ 1157.023678] blackhole_netdev_xmit(): Dropping skb.
[ 1206.529042] blackhole_netdev_xmit(): Dropping skb.
[ 1206.529102] blackhole_netdev_xmit(): Dropping skb.
[ 1206.529139] blackhole_netdev_xmit(): Dropping skb.
[ 1206.529174] blackhole_netdev_xmit(): Dropping skb.