[    2.583215] ip (281) used greatest stack depth: 12344 bytes left
[   23.086285] ip (2220) used greatest stack depth: 12304 bytes left
[  633.353623] ip (24449) used greatest stack depth: 12192 bytes left
[  637.369253] ip (24792) used greatest stack depth: 12064 bytes left
[  822.047700] blackhole_netdev_xmit(): Dropping skb.
[  822.047763] blackhole_netdev_xmit(): Dropping skb.
[  822.047799] blackhole_netdev_xmit(): Dropping skb.
[  822.047833] blackhole_netdev_xmit(): Dropping skb.
[  851.962141] blackhole_netdev_xmit(): Dropping skb.
[  851.962196] blackhole_netdev_xmit(): Dropping skb.
[  851.962232] blackhole_netdev_xmit(): Dropping skb.
[  851.962272] blackhole_netdev_xmit(): Dropping skb.
[ 1028.947919] blackhole_netdev_xmit(): Dropping skb.
[ 1028.947976] blackhole_netdev_xmit(): Dropping skb.
[ 1028.948012] blackhole_netdev_xmit(): Dropping skb.
[ 1028.948043] blackhole_netdev_xmit(): Dropping skb.