[ 2.673155] ip (277) used greatest stack depth: 12360 bytes left [ 2.870437] ip (291) used greatest stack depth: 12352 bytes left [ 8.713626] ip (664) used greatest stack depth: 12344 bytes left [ 713.535806] blackhole_netdev_xmit(): Dropping skb. [ 713.535880] blackhole_netdev_xmit(): Dropping skb. [ 713.535923] blackhole_netdev_xmit(): Dropping skb. [ 713.535977] blackhole_netdev_xmit(): Dropping skb. [ 785.560397] blackhole_netdev_xmit(): Dropping skb. [ 785.560468] blackhole_netdev_xmit(): Dropping skb. [ 785.560519] blackhole_netdev_xmit(): Dropping skb. [ 785.560570] blackhole_netdev_xmit(): Dropping skb.