[    1.817123] ip (238) used greatest stack depth: 12376 bytes left
[    2.366691] ip (272) used greatest stack depth: 12344 bytes left
[    6.912320] ip (656) used greatest stack depth: 12296 bytes left
[   24.457890] ip (2501) used greatest stack depth: 12072 bytes left
[  764.419827] blackhole_netdev_xmit(): Dropping skb.
[  764.419887] blackhole_netdev_xmit(): Dropping skb.
[  764.419922] blackhole_netdev_xmit(): Dropping skb.
[  764.419948] blackhole_netdev_xmit(): Dropping skb.
[ 1111.456180] blackhole_netdev_xmit(): Dropping skb.
[ 1111.456251] blackhole_netdev_xmit(): Dropping skb.
[ 1111.456294] blackhole_netdev_xmit(): Dropping skb.
[ 1111.456331] blackhole_netdev_xmit(): Dropping skb.