linux-kernel - Re: commit 7ffb791423c7 breaks steam game

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Message-ID: <7866593f-0322-4fb3-9729-82366940fc85@nvidia.com>
Date: Fri, 14 Mar 2025 17:14:00 +1100
From: Balbir Singh <balbirs@...dia.com>
To: Bert Karwatzki <spasswolf@....de>
Cc: Ingo Molnar <mingo@...nel.org>, Kees Cook <kees@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Peter Zijlstra <peterz@...radead.org>, Andy Lutomirski <luto@...nel.org>,
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org
Subject: Re: commit 7ffb791423c7 breaks steam game

On 3/14/25 09:22, Bert Karwatzki wrote:
> Am Freitag, dem 14.03.2025 um 08:54 +1100 schrieb Balbir Singh:
>> On 3/14/25 05:12, Bert Karwatzki wrote:
>>> Am Donnerstag, dem 13.03.2025 um 22:47 +1100 schrieb Balbir Singh:
>>>>
>>>>
>>>> Anyway, I think the nokaslr result is interesting, it seems like with nokaslr
>>>> even the older kernels have problems with the game
>>>>
>>>> Could you confirm if with nokaslr
>>>>
>>> Now I've tested kernel 6.8.12 with nokaslr
>>>
>>>> 1. Only one single game stellaris is not working?
>>>> 2. The entire laptop does not work?
>>>> 3. Laptop works and other games work? Just one game is not working as
>>> expected?
>>>
>>>
>>> Stellaris is showing the input lag and the entire graphical user interface shows
>>> the same input lag as long as stellaris is running.
>>> Civilization 6 shows the same input lag as stellaris, probably even worse.
>>> Magic the Gathering: Arena (with wine) works normally.
>>> Valheim also works normally.
>>> Crusader Kings 2 works normally
>>> Rogue Heroes: Ruins of Tasos (a Zelda lookalike) works normally.
>>> Baldur's Gate I & II and Icewind Dale work normally.
>>>
>>> Also the input lag is only in the GUI, if I switch to a text console (ctrl + alt
>>> + Fn), input works normally even while the affected games are running.
>>>
>>> Games aside everything else (e.g. compiling kernels) seems to work with nokaslr.
>>>
>>
>> Would it be fair to assume that anything Xorg/Wayland is working fine
>> when the game is not running, even with nokaslr?
>>
> Yes, Xorg (I'm normally using xfce4 as desktop) works fine. I also tested with
> gnome using Xwayland, here the buggy behaviour also exists, with the addtion
> that mouse position is off, i.e. to click a button in the game you have to click
> somewhat above it.

So the issue is narrowed down to just the games you've mentioned with nokaslr/patch?

> 
>> +amd-gfx@...ts.freedesktop.org to see if there are known issues with
>> nokaslr and the games you mentioned.
>>
>>
>> Balbir Singh
>>
>> PS: I came across an interesting link
>> https://www.alex-ionescu.com/behind-windows-x64s-44-bit-memory-addressing-limit/
>>
>> I think SLIST_HEADER is used by wine as well for user space and I am not sure
>> if in this situation the game is hitting this scenario, but surprisingly the other
>> games are not. This is assuming the game uses wine. I am not sure it's related,
>> but the 44 bits caught my attention.
> 
> Stellaris is a native linux game (x86_64), the one game (MTGA) I tested with
> wine worked fine.
> 

Thanks for the update! I wonder if there are any game logs. If you can look for any
warnings/errors it might be interesting to see where the difference is coming from?

> By the way, the warning
> [ T8562] WARNING: CPU: 14 PID: 8562 at mm/slub.c:5028
> __kvmalloc_node_noprof+0x2fd/0x360
> that appeared in the dmesg I sent you is caused by the upgrade of mesa from
> 25.0.0 to 25.0.1. (I'm still bisecting ...)
> 

Thanks!
Balbir