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

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Message-ID: <b63b1de8-7eec-4235-b61e-e654e78543ba@nvidia.com>
Date: Fri, 14 Mar 2025 08:54:47 +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 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?

+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.