| 2021-04-15 12:17:18 |
Tim Gardner |
bug |
|
|
added bug |
| 2021-04-15 12:17:28 |
Tim Gardner |
nominated for series |
|
Ubuntu Bionic |
|
| 2021-04-15 12:17:28 |
Tim Gardner |
bug task added |
|
linux (Ubuntu Bionic) |
|
| 2021-04-15 12:17:40 |
Tim Gardner |
linux (Ubuntu Bionic): status |
New |
In Progress |
|
| 2021-04-15 12:17:45 |
Tim Gardner |
linux (Ubuntu Bionic): importance |
Undecided |
Medium |
|
| 2021-04-15 12:17:51 |
Tim Gardner |
linux (Ubuntu Bionic): assignee |
|
Tim Gardner (timg-tpi) |
|
| 2021-04-15 12:18:02 |
Tim Gardner |
tags |
|
bot-stop-nagging |
|
| 2021-04-15 12:30:19 |
Ubuntu Kernel Bot |
linux (Ubuntu): status |
New |
Incomplete |
|
| 2021-04-16 17:19:13 |
Terry Rudd |
bug |
|
|
added subscriber Terry Rudd |
| 2021-04-30 13:00:44 |
Tim Gardner |
bug task added |
|
linux-azure-4.15 (Ubuntu) |
|
| 2021-04-30 13:00:58 |
Tim Gardner |
linux-azure-4.15 (Ubuntu Bionic): status |
New |
In Progress |
|
| 2021-04-30 13:01:03 |
Tim Gardner |
linux-azure-4.15 (Ubuntu Bionic): importance |
Undecided |
Medium |
|
| 2021-04-30 13:01:08 |
Tim Gardner |
linux-azure-4.15 (Ubuntu Bionic): assignee |
|
Tim Gardner (timg-tpi) |
|
| 2021-04-30 13:02:08 |
Tim Gardner |
description |
[SRU Justification]
[Impact]
A soft lockup is happening to Azure cloud customers due to a bug in netvsc_poll.
Ubuntu 4.15.0-1103 has CONFIG_NET_POLL_CONTROLLER=y in kernel config file, there is a bug in netvsc that may cause CPU lockup with POLL_CONTROLLER. This bug has been fixed by the following patch:
commit 2a7f8c3b1d3feedee3aa319ac220cbde3725b5d5 ("hv_netvsc: remove ndo_poll_controller")
This commit is in mainline as of 4.20-rc1.
Microsoft would like to request this patch in 4.15 based Azure kernels.
[Test Plan]
Run high stress network traffic on an Azure instance.
[Where problems could occur]
There could be a decrease in performance or dropped packets due to NAPI not being able to keep up. |
[SRU Justification]
SF#00308239
[Impact]
A soft lockup is happening to Azure cloud customers due to a bug in netvsc_poll.
Ubuntu 4.15.0-1103 has CONFIG_NET_POLL_CONTROLLER=y in kernel config file, there is a bug in netvsc that may cause CPU lockup with POLL_CONTROLLER. This bug has been fixed by the following patch:
commit 2a7f8c3b1d3feedee3aa319ac220cbde3725b5d5 ("hv_netvsc: remove ndo_poll_controller")
This commit is in mainline as of 4.20-rc1.
Microsoft would like to request this patch in 4.15 based Azure kernels.
[Test Plan]
Run high stress network traffic on an Azure instance.
[Where problems could occur]
There could be a decrease in performance or dropped packets due to NAPI not being able to keep up. |
|
| 2021-04-30 13:21:44 |
Tim Gardner |
linux-azure-4.15 (Ubuntu Bionic): status |
In Progress |
Fix Committed |
|
| 2021-04-30 13:22:07 |
Tim Gardner |
linux (Ubuntu Bionic): status |
In Progress |
Invalid |
|
| 2021-04-30 13:22:12 |
Tim Gardner |
linux (Ubuntu Bionic): assignee |
Tim Gardner (timg-tpi) |
|
|
| 2021-05-18 17:04:22 |
Ubuntu Kernel Bot |
tags |
bot-stop-nagging |
bot-stop-nagging verification-needed-bionic |
|
| 2021-05-24 19:00:02 |
Tim Gardner |
tags |
bot-stop-nagging verification-needed-bionic |
bot-stop-nagging verification-done-bionic |
|
| 2021-06-02 19:32:43 |
Launchpad Janitor |
linux-azure-4.15 (Ubuntu Bionic): status |
Fix Committed |
Fix Released |
|
