group.of.nepali.translators team mailing list archive

[Marcelo Cerri <1826416@xxxxxxxxxxxxxxxxxx>]

** Description changed:

+ [Impact]
+ 
  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.
+ 
+ [Test Case]
+ 
+ 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.
+ 
+ [Regression Potential]
+ 
+ Low risk since that's a simple patch from stable upstream touching only
+ Hyper-V specific code.

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

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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
Status in linux source package in Xenial:
  In Progress

Bug description:
  [Impact]

  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.

  [Test Case]

  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.

  [Regression Potential]

  Low risk since that's a simple patch from stable upstream touching
  only Hyper-V specific code.

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