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

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Message-ID: <fa8d5e76694918bdaae9faee9648776f298f78ca.camel@web.de>
Date: Thu, 13 Mar 2025 23:22:06 +0100
From: Bert Karwatzki <spasswolf@....de>
To: Balbir Singh <balbirs@...dia.com>
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, spasswolf@....de
Subject: Re: commit 7ffb791423c7 breaks steam game

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.

> +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.

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 ...)

Bert Karwatzki