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From: Arnd Bergmann <arnd@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>,
	Mark Rutland <mark.rutland@arm.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues
Date: Wed, 6 Jan 2021 22:04:53 +0100	[thread overview]
Message-ID: <CAK8P3a2u=WtQ_98F2934QEZM19YaDPkfzQzHoiCgnaBYi3Qw3g@mail.gmail.com> (raw)
In-Reply-To: <20210106172033.GA2165@willie-the-truck>

On Wed, Jan 6, 2021 at 6:22 PM Will Deacon <will@kernel.org> wrote:
> On Wed, Jan 06, 2021 at 01:52:53PM +0000, Russell King - ARM Linux admin wrote:

>
>    and the resulting Image is here:
>
>    https://mirrors.edge.kernel.org/pub/linux/kernel/people/will/bugs/rmk/Image-5.9.0
>
> 3. Using that kernel, I boot into a 64-bit Debian 10 filesystem and open a
>    couple of terminals over SSH.
>
> 4. In one terminal, I run:
>
>    $ while (true); do find /var /usr /bin /sbin -type f -print0 | xargs -0
>      md5sum > /dev/null; echo 2 | sudo tee /proc/sys/vm/drop_caches; done
>
>    (note that sudo will prompt you for a password on the first iteration)
>
> 5. In the other terminal, I run:
>
>    $ while (true); do ./hackbench ; sleep 1; done
>
>    where hackbench is built from:
>
>    https://people.redhat.com/mingo/cfs-scheduler/tools/hackbench.c
>
>    and compiled according to comment in the source code.

I tried the Image-5.9.0 on a virtual machine with seven CPUs (two clusters)
running in an M1 mac mini and ran these commands inside.

> With that, I see the following after ten seconds or so:
>
>   EXT4-fs error (device sda2): ext4_lookup:1707: inode #674497: comm md5sum: iget: checksum invalid
>
> Russell, Mark -- does this recipe explode reliably for you too?

Negative unfortunately -- no checksum mismatch so far, with 10 minutes
elapsed. I'll keep it running a bit longer.

        arnd

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Theodore Ts'o <tytso@mit.edu>,
	Russell King - ARM Linux admin <linux@armlinux.org.uk>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Ext4 Developers List <linux-ext4@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues
Date: Wed, 6 Jan 2021 22:04:53 +0100	[thread overview]
Message-ID: <CAK8P3a2u=WtQ_98F2934QEZM19YaDPkfzQzHoiCgnaBYi3Qw3g@mail.gmail.com> (raw)
In-Reply-To: <20210106172033.GA2165@willie-the-truck>

On Wed, Jan 6, 2021 at 6:22 PM Will Deacon <will@kernel.org> wrote:
> On Wed, Jan 06, 2021 at 01:52:53PM +0000, Russell King - ARM Linux admin wrote:

>
>    and the resulting Image is here:
>
>    https://mirrors.edge.kernel.org/pub/linux/kernel/people/will/bugs/rmk/Image-5.9.0
>
> 3. Using that kernel, I boot into a 64-bit Debian 10 filesystem and open a
>    couple of terminals over SSH.
>
> 4. In one terminal, I run:
>
>    $ while (true); do find /var /usr /bin /sbin -type f -print0 | xargs -0
>      md5sum > /dev/null; echo 2 | sudo tee /proc/sys/vm/drop_caches; done
>
>    (note that sudo will prompt you for a password on the first iteration)
>
> 5. In the other terminal, I run:
>
>    $ while (true); do ./hackbench ; sleep 1; done
>
>    where hackbench is built from:
>
>    https://people.redhat.com/mingo/cfs-scheduler/tools/hackbench.c
>
>    and compiled according to comment in the source code.

I tried the Image-5.9.0 on a virtual machine with seven CPUs (two clusters)
running in an M1 mac mini and ran these commands inside.

> With that, I see the following after ten seconds or so:
>
>   EXT4-fs error (device sda2): ext4_lookup:1707: inode #674497: comm md5sum: iget: checksum invalid
>
> Russell, Mark -- does this recipe explode reliably for you too?

Negative unfortunately -- no checksum mismatch so far, with 10 minutes
elapsed. I'll keep it running a bit longer.

        arnd

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  parent reply	other threads:[~2021-01-06 21:05 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05 15:47 Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues Russell King - ARM Linux admin
2021-01-05 15:47 ` Russell King - ARM Linux admin
2021-01-05 18:27 ` Darrick J. Wong
2021-01-05 18:27   ` Darrick J. Wong
2021-01-05 19:50   ` Russell King - ARM Linux admin
2021-01-05 19:50     ` Russell King - ARM Linux admin
2021-01-06 11:53 ` Mark Rutland
2021-01-06 11:53   ` Mark Rutland
2021-01-06 12:13   ` Russell King - ARM Linux admin
2021-01-06 12:13     ` Russell King - ARM Linux admin
2021-01-06 13:52   ` Russell King - ARM Linux admin
2021-01-06 17:20     ` Will Deacon
2021-01-06 17:20       ` Will Deacon
2021-01-06 17:46       ` Russell King - ARM Linux admin
2021-01-06 17:46         ` Russell King - ARM Linux admin
2021-01-06 21:04       ` Arnd Bergmann [this message]
2021-01-06 21:04         ` Arnd Bergmann
2021-01-06 22:00         ` Arnd Bergmann
2021-01-06 22:00           ` Arnd Bergmann
2021-01-06 22:32       ` Russell King - ARM Linux admin
2021-01-06 22:32         ` Russell King - ARM Linux admin
2021-01-07 11:18         ` Russell King - ARM Linux admin
2021-01-07 11:18           ` Russell King - ARM Linux admin
2021-01-07 12:45           ` Russell King - ARM Linux admin
2021-01-07 12:45             ` Russell King - ARM Linux admin
2021-01-07 13:16             ` Arnd Bergmann
2021-01-07 13:16               ` Arnd Bergmann
2021-01-07 13:37               ` Russell King - ARM Linux admin
2021-01-07 13:37                 ` Russell King - ARM Linux admin
2021-01-07 16:27                 ` Theodore Ts'o
2021-01-07 16:27                   ` Theodore Ts'o
2021-01-07 17:00                   ` Florian Weimer
2021-01-07 17:00                     ` Florian Weimer
2021-01-07 21:48                   ` Arnd Bergmann
2021-01-07 21:48                     ` Arnd Bergmann
2021-01-07 22:14                     ` Russell King - ARM Linux admin
2021-01-07 22:14                       ` Russell King - ARM Linux admin
2021-01-07 22:41                       ` Eric Biggers
2021-01-07 22:41                         ` Eric Biggers
2021-01-08  8:21                         ` Ard Biesheuvel
2021-01-08  8:21                           ` Ard Biesheuvel
2021-01-07 22:27                     ` Eric Biggers
2021-01-07 22:27                       ` Eric Biggers
2021-01-07 23:53                       ` Darrick J. Wong
2021-01-07 23:53                         ` Darrick J. Wong
2021-01-08  8:05                         ` Arnd Bergmann
2021-01-08  8:05                           ` Arnd Bergmann
2021-01-08  9:13                   ` Peter Zijlstra
2021-01-08  9:13                     ` Peter Zijlstra
2021-01-08 10:31                   ` Pavel Machek
2021-01-08 10:31                     ` Pavel Machek
2021-01-07 21:20                 ` Arnd Bergmann
2021-01-07 21:20                   ` Arnd Bergmann
2021-01-08  9:21                   ` Peter Zijlstra
2021-01-08  9:21                     ` Peter Zijlstra
2021-01-08  9:26                     ` Will Deacon
2021-01-08  9:26                       ` Will Deacon
2021-01-08 20:02                       ` Linus Torvalds
2021-01-08 20:02                         ` Linus Torvalds
2021-01-08 20:22                         ` Arnd Bergmann
2021-01-08 20:22                           ` Arnd Bergmann
2021-01-08 21:20                           ` Nick Desaulniers
2021-01-08 21:20                             ` Nick Desaulniers
2021-01-08 20:29                         ` Russell King - ARM Linux admin
2021-01-08 20:29                           ` Russell King - ARM Linux admin
2021-01-12 13:20                         ` Lukas Wunner
2021-01-12 13:31                           ` Florian Weimer
2021-01-12 13:31                             ` Florian Weimer
2021-01-12 13:46                             ` David Laight
2021-01-12 13:46                               ` David Laight
2021-01-12 17:28                           ` Linus Torvalds
2021-01-12 17:28                             ` Linus Torvalds
2021-01-14 13:13                             ` Lukas Wunner

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