linux-kernel - [regression] segfault in Qt apps running on Linux kernel 6.10.8 ARM with LPAE

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Message-ID: <bf8288c9-13a1-47f0-9842-3b8eff37ef65@leemhuis.info>
Date: Wed, 25 Sep 2024 14:23:35 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Linus Walleij <linus.walleij@...aro.org>,
 Catalin Marinas <catalin.marinas@....com>
Cc: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
 linux-arm-kernel@...ts.infradead.org,
 Linux kernel regressions list <regressions@...ts.linux.dev>,
 LKML <linux-kernel@...r.kernel.org>, Andrew <quark@...root.org>
Subject: [regression] segfault in Qt apps running on Linux kernel 6.10.8 ARM
 with LPAE

Hi, Thorsten here, the Linux kernel's regression tracker.

Catalin, Linus, I noticed a report about a regression in
bugzilla.kernel.org that appears to be caused by a change of yours:

7af5b901e84743 ("ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table
walks disablement") [v6.10-rc1]

As many (most?) kernel developers don't keep an eye on the bug tracker,
I decided to write this mail. To quote from https://bugzilla.kernel.org/
show_bug.cgi?id=219247 :

> Trying to run LxQt on a Chromebook XE303C12 with Devuan 4 and Linux
> kernel 6.10.8 results in a segmentation fault (for LxQt). There are
> no such problems with Linux kernel 6.9.12 or earlier. With Linux
> kernel 6.10.8 it is possible to run Xfce4, but trying to run for
> example Kate ends in a segmentation fault. Mesa 20.3.5, patched for
> partial hardware acceleration, preserves this acceleration in Xfce4.
> The mpv works using acceleration regardless of the Linux kernel
> version. dmesg does not give anything significantly new compared to
> previous kernel version.

See the ticket for more details and the bisection log. The reporter is CCed.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

P.S.: let me use this mail to also add the report to the list of tracked
regressions to ensure it's doesn't fall through the cracks:

#regzbot introduced: 7af5b901e84743c608aae90cb0e429702812c324
#regzbot title: ARM: segfault in Qt apps running on Linux kernel 6.10.8
ARM with LPAE
#regzbot from: Andrew
#regzbot duplicate: https://bugzilla.kernel.org/show_bug.cgi?id=219247
#regzbot ignore-activity