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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C43BC433EF for ; Tue, 12 Oct 2021 12:59:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3442461040 for ; Tue, 12 Oct 2021 12:59:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236636AbhJLNBs (ORCPT ); Tue, 12 Oct 2021 09:01:48 -0400 Received: from mout.gmx.net ([212.227.15.19]:56069 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236644AbhJLNBs (ORCPT ); Tue, 12 Oct 2021 09:01:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1634043584; bh=rP/0mCTXimGhqNWB790DoIN8q91sy/KFE+LyZ42QCfk=; h=X-UI-Sender-Class:Date:Subject:To:References:From:In-Reply-To; b=M+IpxHrernWPudmCuti9+0+ADbz5/1sGDsaQfH+6Or0R8ucAX/jsGU1ry7ncDjaKC 6CddUJOFOfbgc4dCbVi0EtQj3LDblMdtTGlyO/PiKcDDoAGLhMdvMYaVW+yMjh922Y EsSmRjUdAk9cezHf7O5vIfk+ShHu4nb29IsDxi08= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.net (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MxUs7-1myA102Vcv-00xsSc; Tue, 12 Oct 2021 14:59:44 +0200 Content-Type: multipart/mixed; boundary="------------ZviG02GsNzpNz59h4BdH8RHA" Message-ID: <3a913681-58ee-6fe0-c414-3e33deafdf1e@gmx.com> Date: Tue, 12 Oct 2021 20:59:40 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.1 Subject: Re: All Three Superblocks Damaged After Kernel Panic Content-Language: en-US To: K Chapman , linux-btrfs@vger.kernel.org References: <91bf1af1-494b-ee3a-01c9-07a4ad836eb7@gmx.com> <5d8526c2-425d-fef6-833f-2164c0bf754a@kchapman.de> <8553dafa-14c5-b09f-d10f-83d995d062e0@kchapman.de> From: Qu Wenruo In-Reply-To: <8553dafa-14c5-b09f-d10f-83d995d062e0@kchapman.de> X-Provags-ID: V03:K1:3re8wMRKNfcMSOoilg5Hnxs/N3T8+3MaGVUoidEiYs7pNVTxvDM 5U2IULVcHsmV8wVgBcJVh4kcE+N33TQan0ZDMbAiIrvr+D8iRUuiNGpmJehSdClCpjTLldP +onDeYorI7nhtKtC7u63z5QYSE/AZoOyeZ8H+xDOvqxgx6IH8qlq54ygq6VqIDAVFnIu67u 8jO54VAx4qFh805Lu1F6w== X-UI-Out-Filterresults: notjunk:1;V03:K0:eg6vzrgKxg0=:FRRTMmBXyX7cBN6rr8JqVE PM3mDm1B5dEDdCzC2VIfdmwai/kRvXk9dMBQZ3HUD5ViBMOviRH5p+CGMZr6uRXhRuCYSO8tk 3Kf5L2IIw95MqFYG9gNqgaoK7DS6c6h+qqhySJoj4CCqcWPJhsXOn+bokDk9nYxKX39WA6/ml 4ZIKl/25PKE9xha3G3AQTEHyyr7UKF9PPo4SNiyph0hPknGKb9yXJA/EFXBylp0YUrKgQJbif VSi6LZZbuyWkJgy/BsqQM8dF3OEdljbZ5R3jR6Mz8bEQ3oCx6eFCx3KPZSsuiEav/59jC7OoL Nhv9VNwC12ZANfMRrrKIlFfJDPqNaZoMrBOgc+L5OA/WKOtQaC0GswLLTLFMD8VBjw3tXqNNj 3xX9QQ6+BkqtJ878WDOkdEok1HS6/I1hQHs+Vx8S2LkvLkep6rqdisdg9aKqbbCeXpltxxvcb jJo7PFvQJFliw8jnjd1L/aIX+iL+Mt7SsyPgavF3+4J9Yuwy9ILyrTArdbx3AD3vBNuy7c3aT KaV8ti3sIpi4lQest3k1smjuvnreqgaw0TvDE2I00d+ITw2hJFcV41+nsdjxo6puemjLOdOiB CwhF+wWTCmTKwU+rV/txYhvA+lT35QgzypFtUCrfsQwHj6+cs2Hd+pXC881rQHZTuUYxHBQs2 j2q6UfFGrDTVMzN3Nr1cgvGCr/U4TJbe+nc8TLjqpiapfkPSD1KRKut14rztwYNNs1wL75e7t OkkvAVctxQaiLAEVldkKSTcJFB286gs/xuznxZNcejXXfglCeCCHwyOL49WHGvzwAWtmjcdak BSPGiJ2cSvpAR4+6RpUxZupPJ8CMIkOfHIp1UqhCmD6cvrjoeTOqPUi4qPH9H3XiIHw0SXKfa 35KzhjcV0totqI3iKw3LMkkp+JrSu+1/T16JSRE+/IP8EUJWqDtNsJZCcxXTv0WVGilq7uIhD JyVC28ySobaUrsdn2MRbeesQHK96ETSgY+JbVlYX15PjVCQGhEDfas7uj0mW7KaSwEHBWPn2a fQdOsyeVqyzn2KbZ8Fq6JVAuO2in+E/GtefmIa3VDFO7GsraIRj3X+cilGeXMJ3UgwJVAbZIe 64oG50n2yVlTL4= Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is a multi-part message in MIME format. --------------ZviG02GsNzpNz59h4BdH8RHA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2021/10/12 18:35, K Chapman wrote: > Qu, > > RE: If you don't have the tool to do it by your own, please send the 4K > super block (dd if=3D/dev/mapper/home bs=3D1 skip=3D65536 count=3D4096 > of=3D/tmp/sb.dump) to me so I could do that for you. > > See attached. Re-csumed super block is attached. It passes my local test using btrfs-ins-dump-super. Thus the csum should be correct. Wish you good luck salvaging your data. I would try mount with "-o ro,rescue=3Dall" first, if no luck then btrfs-restore --dry-run to see what can be salvaged. But I doubt how many can be salvaged, consider how corrupted the backup super blocks are. Thanks, Qu > > RE: Power loss and data writes. > > I believe the possibility is present but remote. I have not had a panic > on x86 in many years during general work, this is more of an indication > of some sort of problem than simply removing power at a bad time. It > seems more likely, that for whatever reason, the kernel wrote spurious > data to certain sectors, it will be interesting to see. > > Thank you! > > Kyle C. --------------ZviG02GsNzpNz59h4BdH8RHA Content-Type: application/octet-stream; name="sb.dump" Content-Disposition: attachment; filename="sb.dump" Content-Transfer-Encoding: base64 yt72HAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAC9WHKtj+5NkLBIuBEgzjJUAAABAAAA AAABAAAAAAAAAF9CSFJmU19NHnUCAAAAAAAAQL7YqQMAAAAAUAEAAAAAAAAAAAAAAAAAAAAA AAAAAABgfYGjAwAAAIAiMJwDAAAGAAAAAAAAAAEAAAAAAAAAABAAAABAAAAAQAAAABAAAIEA AAAgXQIAAAAAAAAAAAAAAAAAAAAAAAAAAABhAQAAAAAAAAAAAQEAAQAAAAAAAAAAYH2BowMA AAAAbcGiAwAAABAAAAAQAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAR1k8 TWidTh6jENx7irJsUb1Ycq2P7k2QsEi4ESDOMlQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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