From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0227C433DB for ; Wed, 6 Jan 2021 17:22:03 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2E04223120 for ; Wed, 6 Jan 2021 17:22:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E04223120 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=S91juqOFYfRllgWRiW2RQD7ZfATuYpgOCb33xXBi52I=; b=2bZ/3SlmA3zyczxdZo0wa+2Y2 7w476hfEcabycd3q8YkFEhI6zV3ATPDiV0YzTJv2okmomOthXWV1vqvVPBWHeSCsyK49G+hKefvNR RCP4GWIxnCMeqN0rbCPYAJtBGFk/5MSrkvD+EkS/k7ldW3WgvuoABaSOsmnSpV2T73tka83nI+Q1E hcPV1upZPPzn2Hy69nKjNA4h9D9ItxFq2tJzT/c7Hb8OJxqbby/xWWvhliXT4xlVWyvJfYsR9dKI9 g7LsA3sc9VrtwZrW6b31ZNkTEZ9H/zLpK1HtJfWIRTU1wytYEKewVyxwVdRBm9vxRCS71bfD9EXqv UFrzcNCCw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxCUE-0001wK-FB; Wed, 06 Jan 2021 17:20:42 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxCUC-0001vh-4Q for linux-arm-kernel@lists.infradead.org; Wed, 06 Jan 2021 17:20:41 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7033123106; Wed, 6 Jan 2021 17:20:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609953638; bh=tG483r6vSnH9q4KcPpc+fYsYrKAgLFenh4LOpI9MOeE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XrEv5AiFCg7oby6QMVQS2REt2mZxeBqgKabR3TufWYYR+rnHN/Y+pCL/etyHK8KY5 yXuJIG8lSFwu9PDqysxCE0Wwv04s53xiA/21+EAN/EdrRfqpn2K/NcM0LPoevRC8YZ Zn6jf36KYBLxvLDfo8H+DlV1nsZpe6PLOqUj0eYM+DTTko+7JOUfd8CLw2+pvq7ZkG SDSEikynYeiOcdrodBp4lgEObuMnGCfEIHXpxuUUc6TTUIqV7A7Al7kps0BmLWZMWf Ca0nfbVxz3SaYqw/CaN8fBGbyRWZCeClW0NG7tJBRTH+ghblhrmqxCw4dDi2OBiljq YvohqFfz2gh3g== Date: Wed, 6 Jan 2021 17:20:34 +0000 From: Will Deacon To: Russell King - ARM Linux admin Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues Message-ID: <20210106172033.GA2165@willie-the-truck> References: <20210105154726.GD1551@shell.armlinux.org.uk> <20210106115359.GB26994@C02TD0UTHF1T.local> <20210106135253.GJ1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210106135253.GJ1551@shell.armlinux.org.uk> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210106_122040_400411_5BF846BF X-CRM114-Status: GOOD ( 21.30 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Theodore Ts'o , linux-kernel@vger.kernel.org, Andreas Dilger , linux-ext4@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jan 06, 2021 at 01:52:53PM +0000, Russell King - ARM Linux admin wrote: > On Wed, Jan 06, 2021 at 11:53:59AM +0000, Mark Rutland wrote: > > ... and are you using defconfig or something else? > > Not sure I replied to this. I'm not using the defconfig, I've my own > .config > > As I mentioned, Will has built a 5.10 kernel using Arnd's gcc 4.9.4 > and hasn't been able to reproduce it. He's sent me his kernel, which > I've booted here, and haven't yet been able to provoke it. > > Meanwhile, my 5.9 kernel continues to exhibit this problem, so I've > sent Will my .config (which I'll include here.) There are differences > in some of the block layer configuration. There's differences in the > errata configuration, but we don't think that's a cause (they're not > relevant for Cortex A72). > > Our plan is: > - Will is switching to 5.9, and using my config as a base for his > platform. > - Will is going to send me his modified version of my config. > - We are both going to build using the same kernel sources and same > config. > - We are going to test our own kernels, and also swap kernel images > and test each others. > > Watch this space for more news... I've managed to reproduce the corruption on my AMD Seattle board (8x A57). I haven't had a chance to dig deeper yet, but here's the recipe which works for me: 1. I'm using GCC 4.9.4 simply to try to get as close as I can to rmk's setup. I don't know if this is necessary or not, but the toolchain is here: https://kernel.org/pub/tools/crosstool/files/bin/arm64/4.9.4/arm64-gcc-4.9.4-nolibc-aarch64-linux-gnu.tar.xz and I needed to pull down an old libmpfr to get cc1 to work: http://ports.ubuntu.com/pool/main/m/mpfr4/libmpfr4_3.1.2-1_arm64.deb 2. I build a 5.9 kernel with the config here: https://mirrors.edge.kernel.org/pub/linux/kernel/people/will/bugs/rmk/config-5.9.0 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. 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? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel