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=-2.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 A9F99C83000 for ; Thu, 30 Apr 2020 01:46:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 881902083B for ; Thu, 30 Apr 2020 01:46:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="UecffErN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726701AbgD3Bq5 (ORCPT ); Wed, 29 Apr 2020 21:46:57 -0400 Received: from mout.gmx.net ([212.227.17.20]:54927 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726634AbgD3Bq4 (ORCPT ); Wed, 29 Apr 2020 21:46:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1588211213; bh=4URtmLtlf+RK81wlvJvrlPFlMtxGS+ECsIs1sHxA32M=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=UecffErNgGpH2sw+4qQwt8JLnHUk3LQDtlknmAIV7t5/pfhz26OU/2hIYJLwtu92R AsZv0XgCqN5hXGeMKoVZsD/hIrOs7Fok8NGFuemov5qUeeOarzrna1jyFBMDGs+1pw djHs8gVAE5wTMGG4TynZWb97Whg0o/lDwf9eIMHM= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.com (mrgmx104 [212.227.17.174]) with ESMTPSA (Nemesis) id 1N63RQ-1j5xES3lM0-016M2g; Thu, 30 Apr 2020 03:46:53 +0200 Subject: Re: many csum warning/errors on qemu guests using btrfs To: Chris Murphy , Michal Soltys Cc: Btrfs BTRFS References: <0ee3844d-830f-9f29-2cd5-61e3c9744979@yandex.pl> <76ec883b-3e44-fcda-d981-93a9e120f56d@yandex.pl> From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0IlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT6JAU4EEwEIADgCGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1oQAKCRDC PZHzoSX+qCY6CACd+mWu3okGwRKXju6bou+7VkqCaHTdyXwWFTsr+/0ly5nUdDtT3yEVggPJ 3VP70wjlrxUjNjFb6iIvGYxiPOrop1NGwGYvQktgRhaIhALG6rPoSSAhGNjwGVRw0km0PlIN D29BTj/lYEk+jVM1YL0QLgAE1AI3krihg/lp/fQT53wLhR8YZIF8ETXbClQG1vJ0cllPuEEv efKxRyiTSjB+PsozSvYWhXsPeJ+KKjFen7ebE5reQTPFzSHctCdPnoR/4jSPlnTlnEvLeqcD ZTuKfQe1gWrPeevQzgCtgBF/WjIOeJs41klnYzC3DymuQlmFubss0jShLOW8eSOOWhLRuQEN BFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcgaCbPEwhLj 1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj/IrRUUka 68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fNGSsRb+pK EKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0q1eW4Jrv 0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEvABEBAAGJ ATwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1rgUJCWpOfwAKCRDCPZHz oSX+qFcEB/95cs8cM1OQdE/GgOfCGxwgckMeWyzOR7bkAWW0lDVp2hpgJuxBW/gyfmtBnUai fnggx3EE3ev8HTysZU9q0h+TJwwJKGv6sUc8qcTGFDtavnnl+r6xDUY7A6GvXEsSoCEEynby 72byGeSovfq/4AWGNPBG1L61Exl+gbqfvbECP3ziXnob009+z9I4qXodHSYINfAkZkA523JG ap12LndJeLk3gfWNZfXEWyGnuciRGbqESkhIRav8ootsCIops/SqXm0/k+Kcl4gGUO/iD/T5 oagaDh0QtOd8RWSMwLxwn8uIhpH84Q4X1LadJ5NCgGa6xPP5qqRuiC+9gZqbq4Nj Message-ID: Date: Thu, 30 Apr 2020 09:46:49 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="2elsNlWMoDLS1naF3lapWn8fAybx4NJLC" X-Provags-ID: V03:K1:v5SIylk+s1HQ2oCRJk7IvlqyNHvlKCpkBm/K1Dp1AR3dUrwTjyL eu7FTLNqM2mFJq5afO9KuW1pY38M0MBvBc9s+I30cM/CIGyRXfb8WR224A6oAmRt9Sic3+V a0pGyuwF6T7Yjinp7Ul5s6mHnYm6xFJD3b5om01f6UgN4zCR5ERZsfLQRIloNzI/6YM38n0 7ef/BIeetnkotSi8Zdcpw== X-UI-Out-Filterresults: notjunk:1;V03:K0:+dplnMF8ZqU=:IzORSRGwf2Kmxvq0TOPal3 8A81qKRo6OGboAj7jkd3VnC059ITCRVSVW6JhZgotdLeHvei1Yhmvl3iP0i+oyVsqVZgiHAWb IPW/oF9wiei3TNgOm/D/4PnrzXfWodOIqDSV6M5SyHa8lejrvlyyvVHz6EnqgsafBblzTgbNU LM0PjtkMtAB76p+mhzNMaD2sS+tJxONhgBM9msWN4/o5bB8tmbQQmXBRDifabX8wr2YQUOnSs KxL6K9QC5pF/ozwaa8EqlPX2sKe2q70e8jVMTzui+loB0HXDmg0hkBf24vh9Oh2Abn9Y99P/B x7S84kupq48CORhNNoc8hz/3BRgHacryZK6y5vG38jo/vkb2s56tbFti0GWOuUpaNrvMdKuo/ 25f2Q8IBs5vu8zwwJT2z9ryYJqcBqZZzFJQxDj3tBffNG63z0A90Frv42u72K4BvQvV6Z1n0W QMChYom99RsOsQQBbN4USUo+ww5RDFKJeesW3eLaf5dEHzZMp45VqxvY//jqRKqYvDXA/aDK7 eMDizv+HNMlwmcOXEcKwSEkWTxVgZaXoB13GT3IVHBBD9t9kQgRrfJDuWkoNY0suuqUWqcMhg gpKj1dIEuyqj9ULAFuggiVZhaOyt1v1e8sJyLGQDZ2mFvKs+rgiFUwbrbyNSfTsazpembM9VG FIDYh0TFtjsGaLKJBs69a8DzBcXvl6fkWo+TFP+N+Vp3xLFhiMO9j+1esMgSD856hZj8zLWZ+ CHnQzGGFZ0idkK+HgpPZkbafJvOM26SBWZ8EXAQ4Fd1Ev9RKk7Kl5IH95u3NbQGW35/f+I0dA pFohlbOv4BBYbYgOc1wkY27Culb+kXLnSmFMrDB88n6uxxc8UbHzAdYozJLQvH7Z4DATj15j4 esEFGuribp9mbZHpocxk+GOoxQHZgBMG/zfqmQtRAZxU5Ikuq6kVCcA9uQzIZEKOvsH3q5esQ X+wQJYJmScpKl6ZXkL5EB3ixNZv6F+eM5rl/P1PEiGZrOc8AGdHOpPEwMDw7Tz/rJxqLZjWY2 nZTClHkGRkd3KssC6bzM5fpbTh5Ow83ChDFVzCI6zgLE0l/aTZxUCm1hyCQExek+6fn4ujfHk PinmJ3Bgp9anH4SJaNyy4FKcbZhkIhmXxbgvcl5NNVmBw2B5yLcmmSkQMFaGlpBybrnfQmb5q NEIO7DNayK2fiJ/heNAvnssRrZdqiJsB2ctZCRuknVFUJxcYYlxUo2wyNCzMJy8wdVr0sykB5 KtLhJyOOD4bJXNVn0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --2elsNlWMoDLS1naF3lapWn8fAybx4NJLC Content-Type: multipart/mixed; boundary="MsOWPtIYmuHjtIRoze0J1hffUOZSwJlaT" --MsOWPtIYmuHjtIRoze0J1hffUOZSwJlaT Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020/4/30 =E4=B8=8A=E5=8D=883:21, Chris Murphy wrote: > On Wed, Apr 29, 2020 at 9:45 AM Michal Soltys wro= te: >> >> Short update: >> >> 1) turned out to not be btrfs fault in any way or form, as we recreate= d >> the same issue with ext4 while manually checksumming the files; so if >> anything, btrfs told us we have actual issues somewhere =3D) Is that related to mixing buffered write with DIO write? If so, maybe changing the qemu cache mode may help? Thanks, Qu >> >> 2) qemu/vm scenario is also not to be blamed, as we recreated the issu= e >> directly on the host as well >> >> So as far as I can see, both of the above narrows the potential culpri= ts >> to either faulty/buggy hardware/firmware somewhere - or - some subtle >> lvm/md/kernel issues. Though so far pinpointing the issue is proving >> rather frustrating. >> >> >> Anyway, sorry for the noise. >=20 > It's not noise. I think it's useful to see how Btrfs can help isolate > such cases. >=20 --MsOWPtIYmuHjtIRoze0J1hffUOZSwJlaT-- --2elsNlWMoDLS1naF3lapWn8fAybx4NJLC Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAl6qLgkACgkQwj2R86El /qgeawf8C0LZ/EVioR1X4cA8PxrSKal/WrbExTuE1olrsyOVO/l6AtZ7ZgIGQMDe tiNPv11wut/k+gIwLkMD5nkaoMNVBE9totdtwsTOEF6QcL+BQWofU3BMPtAxnp7y NTAnmUImy5MoZCEiK7mCN59yOKRGhKRJqZDGF1COnjroudh2aeW5QIEbhuJmUw7R RYPm+12KA22yL1+5+3mq8NrKCD/NaQ53VqZcILe6DbURFFjcwAXQp9ZxDz5InfN8 K5/smWgFTfPt1eeJZDEu1ffq4eToJ7dHlkFGt5wo8/yhgfaVUw6YYWdhDTQ4vgM8 114evnkvsbBt4PpooYuBJjOet/bDrA== =d0rw -----END PGP SIGNATURE----- --2elsNlWMoDLS1naF3lapWn8fAybx4NJLC--