[    1.727544] ip (244) used greatest stack depth: 12304 bytes left
[  702.626729] blackhole_netdev_xmit(): Dropping skb.
[  702.626785] blackhole_netdev_xmit(): Dropping skb.
[  702.626816] blackhole_netdev_xmit(): Dropping skb.
[  702.626847] blackhole_netdev_xmit(): Dropping skb.
[  752.112175] blackhole_netdev_xmit(): Dropping skb.
[  752.112244] blackhole_netdev_xmit(): Dropping skb.
[  752.112292] blackhole_netdev_xmit(): Dropping skb.
[  752.112339] blackhole_netdev_xmit(): Dropping skb.
[  939.360386] ip (26631) used greatest stack depth: 12272 bytes left
[ 1048.614022] blackhole_netdev_xmit(): Dropping skb.
[ 1048.614076] blackhole_netdev_xmit(): Dropping skb.
[ 1048.614108] blackhole_netdev_xmit(): Dropping skb.
[ 1048.614141] blackhole_netdev_xmit(): Dropping skb.