| 2019-04-25 14:35:56 |
Joseph Salisbury |
bug |
|
|
added bug |
| 2019-04-25 14:38:59 |
Joseph Salisbury |
summary |
[Xenial] Customer could not SSH to Linux VM due to "VSC State Unhealthy" |
[Xenial] Customer can not SSH to Linux VM due to "VSC State Unhealthy" |
|
| 2019-04-25 15:30:05 |
Ubuntu Kernel Bot |
linux (Ubuntu): status |
New |
Incomplete |
|
| 2019-04-25 15:30:06 |
Ubuntu Kernel Bot |
tags |
kernel-hyper-v |
kernel-hyper-v xenial |
|
| 2019-04-25 16:54:07 |
Dexuan Cui |
bug |
|
|
added subscriber Dexuan Cui |
| 2019-04-25 23:39:17 |
Terry Rudd |
bug |
|
|
added subscriber Terry Rudd |
| 2019-05-13 14:25:54 |
Marcelo Cerri |
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. |
[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. |
|
| 2019-05-13 14:26:01 |
Marcelo Cerri |
nominated for series |
|
Ubuntu Xenial |
|
| 2019-05-13 14:26:01 |
Marcelo Cerri |
bug task added |
|
linux (Ubuntu Xenial) |
|
| 2019-05-13 14:26:09 |
Marcelo Cerri |
linux (Ubuntu Xenial): status |
New |
In Progress |
|
| 2019-06-04 13:30:41 |
Kleber Sacilotto de Souza |
linux (Ubuntu Xenial): status |
In Progress |
Fix Committed |
|
| 2019-06-18 16:04:14 |
Ubuntu Kernel Bot |
tags |
kernel-hyper-v xenial |
kernel-hyper-v verification-needed-xenial xenial |
|
| 2019-06-18 19:19:35 |
Dexuan Cui |
tags |
kernel-hyper-v verification-needed-xenial xenial |
kernel-hyper-v verification-done-xenial xenial |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
linux (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2018-12126 |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2018-12127 |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2018-12130 |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2019-11091 |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2019-11833 |
|
| 2019-07-24 20:29:02 |
Launchpad Janitor |
cve linked |
|
2019-2054 |
|
