From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from james.kirk.hungrycats.org ([174.142.39.145]:34842 "EHLO james.kirk.hungrycats.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751109AbcFUEaz (ORCPT ); Tue, 21 Jun 2016 00:30:55 -0400 Date: Mon, 20 Jun 2016 23:53:24 -0400 From: Zygo Blaxell To: Chris Murphy Cc: Roman Mamedov , Btrfs BTRFS Subject: Re: Adventures in btrfs raid5 disk recovery Message-ID: <20160621035324.GN15597@hungrycats.org> References: <20160620034427.GK15597@hungrycats.org> <20160620231351.1833a341@natsu> <20160620191112.GL15597@hungrycats.org> <20160620204049.GA1986@hungrycats.org> <20160621015559.GM15597@hungrycats.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="nhAUiXSLan16V5i8" In-Reply-To: <20160621015559.GM15597@hungrycats.org> Sender: linux-btrfs-owner@vger.kernel.org List-ID: --nhAUiXSLan16V5i8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jun 20, 2016 at 09:55:59PM -0400, Zygo Blaxell wrote: > In this current case, I'm getting things like this: >=20 > [12008.243867] BTRFS info (device vdc): csum failed ino 4420604 extent 26= 805825306624 csum 4105596028 wanted 787343232 mirror 0 [...] > The other other weird thing here is that I can't find an example in the > logs of an extent with an EIO that isn't compressed. I've been looking > up a random sample of the extent numbers, matching them up to filefrag > output, and finding e.g. the one compressed extent in the middle of an > otherwise uncompressed git pack file. That's...odd. Maybe there's a > problem with compressed extents in particular? I'll see if I can > script something to check all the logs at once... No need for a script: this message wording appears only in fs/btrfs/compression.c so it can only ever be emitted by reading a compressed extent. Maybe there's a problem specific to raid5, degraded mode, and compressed extents? --nhAUiXSLan16V5i8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAldoujQACgkQgfmLGlazG5yqfACdE5fUAvffeTIISS86CW9s+ppI bdkAnjLSce5S/FsBCLCadgdYYtyIzn5o =GFnK -----END PGP SIGNATURE----- --nhAUiXSLan16V5i8--