The kernel being testing is 4.10.0-11-generic, I believe a fix may be in Ubuntu-4.10.0-15.17 that may address this issue. We've seen this sort of issue before, e.g. bug 1654073
I believe the pertinent fix is upstream commit:
commit 449809a66c1d0b1563dee84493e14bf3104d2d7e
Author: Eric Dumazet <email address hidden>
Date: Wed Mar 1 08:39:49 2017 -0800
tcp/dccp: block BH for SYN processing
..and this landed in Ubuntu-4.10.0-15.17 as commit 0c244cdf6da6ddeaa4eed2511a75be8f908763aa
The kernel being testing is 4.10.0-11-generic, I believe a fix may be in Ubuntu-4.10.0-15.17 that may address this issue. We've seen this sort of issue before, e.g. bug 1654073
I believe the pertinent fix is upstream commit:
commit 449809a66c1d0b1 563dee84493e14b f3104d2d7e
Author: Eric Dumazet <email address hidden>
Date: Wed Mar 1 08:39:49 2017 -0800
tcp/dccp: block BH for SYN processing
..and this landed in Ubuntu-4.10.0-15.17 as commit 0c244cdf6da6dde aa4eed2511a75be 8f908763aa