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

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Message-ID: <874j0lvy89.wl-tiwai@suse.de>
Date: Sun, 23 Feb 2025 09:53:10 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: regressions@...ts.linux.dev,
    linux-fsdevel@...r.kernel.org,
    stable@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [REGRESSION] Chrome and VSCode breakage with the commit b9b588f22a0c

[ 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