I have tested the patch referenced in comment #5 and it appears to
resolve the network hang.

I first built and tested the Ubuntu LTS 3.19.0-31.36~14.04.1 kernel and
reproduced the issue using the methodology described in the original bug
description.  This is commit

commit 15e42c329445b4e0f0aecefc39e205c44755c2ba
Author: Luis Henriques <luis.henriq...@canonical.com>
Date:   Thu Oct 8 10:26:57 2015 +0100

    UBUNTU: Ubuntu-lts-3.19.0-31.36~14.04.1

in the lts-backport-vivid branch of git://kernel.ubuntu.com/ubuntu
/ubuntu-trusty.git

I then applied the referenced patch and tested again and was unable to
reproduce the issue after roughly an hour of testing.

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https://bugs.launchpad.net/bugs/1508706

Title:
  Networking hangs on azure using hv_netvsc; bisected

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