From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f172.google.com ([209.85.213.172]:37631 "EHLO mail-ig0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751512AbbHYSMM (ORCPT ); Tue, 25 Aug 2015 14:12:12 -0400 Received: by igui7 with SMTP id i7so17699946igu.0 for ; Tue, 25 Aug 2015 11:12:12 -0700 (PDT) Subject: Re: BTRFS raid6 unmountable after a couple of days of usage. To: Chris Murphy , Btrfs BTRFS References: <55A4F74D.9000305@gmail.com> <55A50DBF.1080602@gmail.com> <55A63F03.2080207@gmail.com> <20150715161546.GR10539@carfax.org.uk> <55A79854.6020309@gmail.com> From: Austin S Hemmelgarn Message-ID: <55DCAFF6.3020007@gmail.com> Date: Tue, 25 Aug 2015 14:12:06 -0400 MIME-Version: 1.0 In-Reply-To: <55A79854.6020309@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms020008010100050007090402" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms020008010100050007090402 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-07-16 07:41, Austin S Hemmelgarn wrote: > On 2015-07-15 17:29, Chris Murphy wrote: >> On Wed, Jul 15, 2015 at 10:15 AM, Hugo Mills wrot= e: >> >>> There is at least one superblock on every device, usually two, an= d >>> often three. Each superblock contains the virtual address of the root= s >>> of the root tree, the chunk tree and the log tree. Those are useless >>> without having the chunk tree, so there's also some information about= >>> the chunk tree appended to the end of each superblock to bootstrap th= e >>> virtual address space lookup. >> >> So maybe Austin can use btrfs-show-super -a on every device and see if= >> there's anything different on some of the devices, that shouldn't be >> different? There must be something the kernel is tripping over that >> the use space tools aren't for some reason. >> >> >> >> > I actually did do so when this happened most recently (I just didn't > think to mention it in the most recent e-mail), and nothing appeared to= > be different either between devices or within a given device (IIRC, > there's 2 sb per device in each of the filesystems in question). > > I'm going to try and reproduce this in a VM for inspection as all the > filesystems I had this issue with now seem to be working fine (with the= > exception of some errors in the data blocks of one that got caught by > scrub). > After an a long time of trying to reproduce this in a Virtual Machine=20 with no success, and increasing issues from the motherboard in the=20 system in question culminating in it dying completely, I'm pretty sure=20 now that this was in fact a hardware problem and not a bug in BTRFS.=20 I've been unable to reproduce it at all after replacing the motherboard. --------------ms020008010100050007090402 Content-Type: application/pkcs7-signature; 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