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 6EB36C433EF for ; Tue, 12 Oct 2021 12:35:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42AE960E74 for ; Tue, 12 Oct 2021 12:35:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236323AbhJLMhi (ORCPT ); Tue, 12 Oct 2021 08:37:38 -0400 Received: from kchapman.de ([185.230.160.25]:34414 "EHLO kchapman.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232900AbhJLMhh (ORCPT ); Tue, 12 Oct 2021 08:37:37 -0400 Received: from [10.68.21.78] (unknown [141.70.80.5]) by kchapman.de (Postfix) with ESMTPSA id 0E0DF60056; Tue, 12 Oct 2021 14:35:35 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kchapman.de; s=20180107; t=1634042135; bh=GQf56ZT8poThOk5MGDXz1Mlugu0JPmwpwt3qffV05GQ=; h=Date:Subject:To:References:From:In-Reply-To; b=QeS/p77Fn3fHvGf+GEc8F5tSbtkBC5Prbii/AQw9TewnEbjaZliYOIodpWmVM4uHP 9uSdF0Nsqu0PAwiy6yvHTAVLf47n7VbPftMAXhKylrhkvTZTk8s4DVctkW1ZavX8FZ fqUOl5Jrqh14CnnxOKWHKsAKE3si+Y4+Fw5wbkqepdngw3RQFxwfK4EMqab9eQWi0B dTXSR9pDCOLHyPAKG7OMrwcwh5b0PSMekzKB8RQLfV+IxvAyZ/JIN2NWDgtAzG3JNg KLyT+Rq5dWrdxhzr9C5Pwp9ZUOjbtctdssThriTCVlVHLQ7KrbaaXX52v1PAp3qUhW aGtNfZO0g9Rwg== Content-Type: multipart/mixed; boundary="------------SppwQR5moo0ouYokb54OYUhF" Message-ID: <8553dafa-14c5-b09f-d10f-83d995d062e0@kchapman.de> Date: Tue, 12 Oct 2021 12:35:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: All Three Superblocks Damaged After Kernel Panic Content-Language: en-DK To: Qu Wenruo , linux-btrfs@vger.kernel.org References: <91bf1af1-494b-ee3a-01c9-07a4ad836eb7@gmx.com> <5d8526c2-425d-fef6-833f-2164c0bf754a@kchapman.de> From: K Chapman In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is a multi-part message in MIME format. --------------SppwQR5moo0ouYokb54OYUhF Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Qu, RE: If you don't have the tool to do it by your own, please send the 4K super block (dd if=/dev/mapper/home bs=1 skip=65536 count=4096 of=/tmp/sb.dump) to me so I could do that for you. See attached. 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! 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