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

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Message-ID: <20251106142956-d6251eba-c696-4a2f-a3e3-af461530d932@linutronix.de>
Date: Thu, 6 Nov 2025 14:32:56 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Mark Brown <broonie@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>, 
	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>, Heiko Carstens <hca@...ux.ibm.com>, 
	Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev <agordeev@...ux.ibm.com>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, 
	Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, 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, 
	Ryan.Roberts@....com
Subject: Re: [PATCH v4 23/35] vdso/datastore: Map pages through struct page

Hi Mark,

On Thu, Nov 06, 2025 at 01:28:35PM +0000, Mark Brown wrote:
> On Tue, Nov 04, 2025 at 09:44:38AM +0100, Marek Szyprowski wrote:
> > On 03.11.2025 16:24, Mark Brown wrote:
> > > On Tue, Oct 14, 2025 at 08:49:09AM +0200, Thomas Weißschuh wrote:
> 
> Copying in Ryan Roberts who's much more likely to have some idea about
> memory management stuff for arm64 than I am (I have been poking at this
> a bit but not got anywhere notable).  Not deleting context for his
> benefit.

It turned out not even to be an mm problem.
Instead the data pages were not zeroed out on allocation.

> Given that this issue is very disruptive to userspace it's causing us to
> miss huge amounts of test coverage for -next, would it be possible to
> drop these patches until we resolve the issue?

This issue and the observed panics should be fixed in v5 of the series:
https://lore.kernel.org/lkml/20251106-vdso-sparc64-generic-2-v5-0-97ff2b6542f7@linutronix.de/

I'll ping tglx directly.

(...)


Thomas