Re: Serious regression on 6.1.x-stable caused by "bounds: support non-power-of-two CONFIG_NR_CPUS"

["Михаил Новоселов" <m.novosyolov@rosalinux.ru>]

(Resending in plain text, sorry for accodently sending in HTML)

----- Исходное сообщение -----
> От: "Matthew Wilcox" <willy@infradead.org>
> Кому: "Михаил Новоселов" <m.novosyolov@rosalinux.ru>
> Копия: riel@surriel.com, mgorman@techsingularity.net, peterz@infradead.org, mingo@kernel.org, akpm@linux-foundation.org,
> stable@vger.kernel.org, sashal@kernel.org, "Бетхер Александр" <a.betkher@rosalinux.ru>, "i gaptrakhmanov"
> <i.gaptrakhmanov@rosalinux.ru>
> Отправленные: Понедельник, 29 Апрель 2024 г 5:56:29
> Тема: Re: Serious regression on 6.1.x-stable caused by "bounds: support non-power-of-two CONFIG_NR_CPUS"

> On Sun, Apr 28, 2024 at 05:58:08PM +0300, Mikhail Novosyolov wrote:
>> Hello, colleagues.
>> 
>> Commit f2d5dcb48f7ba9e3ff249d58fc1fa963d374e66a "bounds: support
>> non-power-of-two CONFIG_NR_CPUS"
>> (https://github.com/torvalds/linux/commit/f2d5dcb48f7ba9e3ff249d58fc1fa963d374e66a)
>> was backported to 6.1.x-stable
>> (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=428ca0000f0abd5c99354c52a36becf2b815ca21),
>> but causes a serious regression on quite a lot of hardware with AMD GPUs,
>> kernel panics.
>> 
>> It was backported to 6.1.84, 6.1.84 has problems, 6/1/83 does not, the newest
>> 6.1.88 still has this problem.
> 
> Does v6.8.3 (which contains cf778fff03be) have this problem?
> How about current Linus master?

6.1.88 - has problem
6.6.27 - does not have problem
6.9-rc from commit efdfbbc4dcc8f98754056971f88af0f7ff906144 https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git - does not have problem

6.8.3 was not tested, but we can test it if needed.


> 
> What kernel config were you using?  I don't see that info on
> https://linux-hardware.org/?probe=9c92ac1222
> (maybe my tired eyes can't see it)

Kernel config for 6.1: https://abf.io/import/kernel-6.1/blob/bcb3e9611f/kernel-x86_64.config
For 6.6: https://abf.io/import/kernel-6.6/blob/7404a4d3d5/kernel-x86_64.config
6.9-rc was built with copypastied config from 6.6 (https://abf.io/build_lists/5028240)