linux-kernel - Re: [REGRESSION] Chrome and VSCode breakage with the commit b9b588f22a0c

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Message-ID: <dede396a-4424-4e0f-a223-c1008d87a6a8@oracle.com>
Date: Sun, 23 Feb 2025 10:18:41 -0500
From: Chuck Lever <chuck.lever@...cle.com>
To: Takashi Iwai <tiwai@...e.de>
Cc: regressions@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] Chrome and VSCode breakage with the commit
 b9b588f22a0c

On 2/23/25 3:53 AM, Takashi Iwai wrote:
> [ resent due to a wrong address for regression reporting, sorry! ]
> 
> Hi,
> 
> we received a bug report showing the regression on 6.13.1 kernel
> against 6.13.0.  The symptom is that Chrome and VSCode stopped working
> with Gnome Scaling, as reported on openSUSE Tumbleweed bug tracker
>   https://bugzilla.suse.com/show_bug.cgi?id=1236943
> 
> Quoting from there:
> """
> I use the latest TW on Gnome with a 4K display and 150%
> scaling. Everything has been working fine, but recently both Chrome
> and VSCode (installed from official non-openSUSE channels) stopped
> working with Scaling.
> ....
> I am using VSCode with:
> `--enable-features=UseOzonePlatform --enable-features=WaylandWindowDecorations --ozone-platform-hint=auto` and for Chrome, I select `Preferred Ozone platform` == `Wayland`.
> """
> 
> Surprisingly, the bisection pointed to the backport of the commit
> b9b588f22a0c049a14885399e27625635ae6ef91 ("libfs: Use d_children list
> to iterate simple_offset directories").
> 
> Indeed, the revert of this patch on the latest 6.13.4 was confirmed to
> fix the issue.  Also, the reporter verified that the latest 6.14-rc
> release is still affected, too.
> 
> For now I have no concrete idea how the patch could break the behavior
> of a graphical application like the above.  Let us know if you need
> something for debugging.  (Or at easiest, join to the bugzilla entry
> and ask there; or open another bug report at whatever you like.)
> 
> BTW, I'll be traveling tomorrow, so my reply will be delayed.
> 
> 
> thanks,
> 
> Takashi
> 
> #regzbot introduced: b9b588f22a0c049a14885399e27625635ae6ef91
> #regzbot monitor: https://bugzilla.suse.com/show_bug.cgi?id=1236943

We received a similar report a few days ago, and are likewise puzzled at
the commit result. Please report this issue to the Chrome development
team and have them come up with a simple reproducer that I can try in my
own lab. I'm sure they can quickly get to the bottom of the application
stack to identify the misbehaving interaction between OS and app.


-- 
Chuck Lever