linux-kernel - Re: qemu-arm64: CONFIG_ARM64_64K_PAGES=y kernel crash on qemu-arm64 with Linux next-20241210 and above

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Message-ID: <20241218175716.GD31418@twin.jikos.cz>
Date: Wed, 18 Dec 2024 18:57:16 +0100
From: David Sterba <dsterba@...e.cz>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: qemu-devel@...gnu.org, open list <linux-kernel@...r.kernel.org>,
	Linux Regressions <regressions@...ts.linux.dev>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	lkft-triage@...ts.linaro.org, linux-mm <linux-mm@...ck.org>,
	Linux btrfs <linux-btrfs@...r.kernel.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Dan Carpenter <dan.carpenter@...aro.org>, Qu Wenruo <wqu@...e.com>,
	David Sterba <dsterba@...e.com>
Subject: Re: qemu-arm64: CONFIG_ARM64_64K_PAGES=y kernel crash on qemu-arm64
 with Linux next-20241210 and above

On Wed, Dec 18, 2024 at 09:22:26PM +0530, Naresh Kamboju wrote:
> On Wed, 18 Dec 2024 at 17:33, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> >
> > The following kernel crash noticed on qemu-arm64 while running the
> > Linux next-20241210 tag (to next-20241218) kernel built with
> >  - CONFIG_ARM64_64K_PAGES=y
> >  - CONFIG_ARM64_16K_PAGES=y
> > and running LTP smoke tests.
> >
> > First seen on Linux next-20241210.
> >   Good: next-20241209
> >   Bad:  next-20241210 and next-20241218
> >
> > qemu-arm64: 9.1.2
> >
> > Anyone noticed this ?
> >
> 
> Anders bisected this reported regression and found,
> # first bad commit:
>   [9c1d66793b6faa00106ae4c866359578bfc012d2]
>   btrfs: validate system chunk array at btrfs_validate_super()

Thanks, I'll drop the patch from linux-next for now.