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

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Message-ID: <87jz9d5cdp.wl-tiwai@suse.de>
Date: Wed, 26 Feb 2025 09:38:42 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: Takashi Iwai <tiwai@...e.de>,
	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 Sun, 23 Feb 2025 16:18:41 +0100,
Chuck Lever wrote:
> 
> 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.

Do you know where to report to?  The reported stuff are no distro
packages, and I myself have no experience with them, hence have no
idea about the upstream development.
If you have more clue about Chrome development, it'd be appreciated if
you can report / ask from your side.  Of course, feel free to put me
to Cc.


thanks,

Takashi