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

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Message-ID: <2025022626-octane-rickety-304a@gregkh>
Date: Wed, 26 Feb 2025 15:35:34 +0100
From: Greg KH <gregkh@...uxfoundation.org>
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, Feb 26, 2025 at 03:26:44PM +0100, Greg KH wrote:
> On Wed, Feb 26, 2025 at 09:20:20AM -0500, Chuck Lever wrote:
> > On 2/26/25 9:16 AM, Takashi Iwai wrote:
> > > 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.
> > 
> > Whoever was the original reporter has the ability to reproduce this and
> > answer any questions the Chrome team might have. Please have them drive
> > this. I'm already two steps removed, so it doesn't make sense for me to
> > report a problem for which I have no standing.
> 
> Ugh, no.  The bug was explictly bisected to the offending commit.  We
> should just revert that commit for now and it can come back in the
> future if the root-cause is found.
> 
> As the revert seems to be simple, and builds here for me, I guess I'll
> have to send it in. {sigh}
> 
> Takashi, thanks for the report and the bisection, much appreciated.

Now sent:
	https://lore.kernel.org/r/2025022644-blinked-broadness-c810@gregkh