linux-kernel - Re: [PATCH v4 23/35] vdso/datastore: Map pages through struct page

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Message-ID: <aQn8G9r2OWv_yEQp@finisterre.sirena.org.uk>
Date: Tue, 4 Nov 2025 13:14:03 +0000
From: Mark Brown <broonie@...nel.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>,
	Nick Alcock <nick.alcock@...cle.com>,
	John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Shuah Khan <shuah@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Theodore Ts'o <tytso@....edu>,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	Russell King <linux@...linux.org.uk>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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	Alexander Gordeev <agordeev@...ux.ibm.com>,
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	Shannon Nelson <sln@...main.com>, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
	linux-s390@...r.kernel.org, Aishwarya.TCV@....com
Subject: Re: [PATCH v4 23/35] vdso/datastore: Map pages through struct page

On Tue, Nov 04, 2025 at 09:44:38AM +0100, Marek Szyprowski wrote:
> On 03.11.2025 16:24, Mark Brown wrote:

> > We do have some other serious breakage affecting arm64 in -next which
> > are making it hard to get a clear picture of which platforms are
> > affected, at least the FVP and O6 are unaffected by those other issues
> > (due to using MTE on platforms that don't have it, those platforms do
> > have MTE).

> I got almost the same result while bisecting on ARM 32bit Exynos-based 
> boards, so the issue with this patchset is not fully ARM64 specific. For 
> some reasons it also doesn't affect all systems though. It is even 
> worse, because it affected only a subset of boards, but different for 
> each tested commit. The observed failure looks exactly the same:

I've now got the results for this specific commit, it looks like every
single arm64 system is failing.  I didn't test any other architectures.

> Then I've tested it on ARM64bit (RaspberrryPi3b+ board) and got the 
> following panic on 6a011a228293 ("vdso/datastore: Map pages through 
> struct page") commit:

I'm seeing the same thing on at least some of the systems - this is with
arm64 defconfig (I suspect that's what Marek is doing too).  For
example:

   https://lava.sirena.org.uk/scheduler/job/2039543#L1109

I didn't check every single failure.  Feeding one of the backtraces
through addr2line says:

/build/stage/linux/include/linux/page-flags.h:284 (discriminator 2)
/build/stage/linux/mm/mmap.c:1438
/build/stage/linux/mm/memory.c:5280
/build/stage/linux/mm/memory.c:5698
/build/stage/linux/mm/memory.c:6487
/build/stage/linux/arch/arm64/mm/fault.c:696
/build/stage/linux/arch/arm64/mm/fault.c:793
/build/stage/linux/arch/arm64/mm/fault.c:929 (discriminator 1)
/build/stage/linux/arch/arm64/include/asm/irqflags.h:55
/build/stage/linux/arch/arm64/kernel/entry-common.c:767
/build/stage/linux/arch/arm64/kernel/entry.S:596

(this is for this specific commit.)

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