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

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Message-ID: <87h64g4wr1.wl-tiwai@suse.de>
Date: Wed, 26 Feb 2025 15:16:18 +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 Wed, 26 Feb 2025 15:11:04 +0100,
Chuck Lever wrote:
> 
> On 2/26/25 3:38 AM, Takashi Iwai wrote:
> > 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?
> 
> You'll need to drive this, since you currently have a working
> reproducer.

No, I don't have, I'm merely a messenger.


Takashi