When the issue happens, there is no error message in dmesg or syslog,
and it's just the host side NetVSP driver stops reading from the guest-
to-host ring, and the guest network stops working. So we don't really
have any logs to provide here.

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https://bugs.launchpad.net/bugs/1826416

Title:
  [Xenial] Customer can not SSH to Linux VM due to "VSC State Unhealthy"

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  A mutual customer is reporting ssh is not working on a Xenial based
  VM.  This VM is running the 4.4 based Xenial kernel and not a custom
  linux-azure kernel.

  After an investigation this is a known old signaling issue.  The 4.4
  based Xenial kernels require the following patch:

  vmbus: fix missing signaling in hv_signal_on_read()
  
(https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=13c5e97701091f9b02ded0c68809f8a6b08c747a).

  The patch is not in the upstream stable 4.4 tree, because it’s not
  needed there.

  Compared to the upstream 4.4 tree, Ubuntu 4.4.0-124-generic integrated
  more hv patches from the mainline kernel, e.g. Drivers: hv: vmbus:
  finally fix hv_need_to_signal_on_read(), so it must pick up the above
  patch.

  We checked the latest Ubuntu 4.4 kernel
  (https://kernel.ubuntu.com/git/ubuntu/ubuntu-
  xenial.git/tree/?h=Ubuntu-4.4.0-146.172) and the patch is also absent
  there.

  The patch (13c5e97701091f9b02ded0c68809f8a6b08c747a) can be cleanly
  cherry-picked into Ubuntu-4.4.0-146.172.

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