From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:36543 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750845AbdAPExk (ORCPT ); Sun, 15 Jan 2017 23:53:40 -0500 Message-ID: <1484542415.21166.1.camel@scientia.net> Subject: Re: corruption: yet another one after deleting a ro snapshot From: Christoph Anton Mitterer To: Qu Wenruo , linux-btrfs@vger.kernel.org Date: Mon, 16 Jan 2017 05:53:35 +0100 In-Reply-To: <657ea421-0058-b641-ef31-c7d371fa58ca@cn.fujitsu.com> References: <1484183243.10253.5.camel@scientia.net> <1484188092.29002.4.camel@scientia.net> <25993bdf-d1fe-30df-7236-b9d5d6e5cfb2@cn.fujitsu.com> <1484499869.17186.1.camel@scientia.net> <4d7e21ed-a8f6-6c75-4a14-ff43201bd27b@cn.fujitsu.com> <1484535383.7577.53.camel@scientia.net> <657ea421-0058-b641-ef31-c7d371fa58ca@cn.fujitsu.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-dg/P2nRurwcMhZdBZmee" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-dg/P2nRurwcMhZdBZmee Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2017-01-16 at 11:16 +0800, Qu Wenruo wrote: > It would be very nice if you could paste the output of > "btrfs-debug-tree -t extent " and "btrfs-debug-tree -t > root=C2=A0 > " >=20 > That would help us to fix the bug in lowmem mode. I'll send you the link in a private mail ... if any other developer needs it, just ask me or Qu for the link. > BTW, if it's possible, would you please try to run btrfs-check > before=C2=A0 > your next deletion on ro-snapshots? You mean in general, when I do my next runs of backups respectively snaphot-cleanup? Sure, actually I did this this time as well (in original mode, though), and no error was found. For what should I look out? > Not really needed, as all corruption happens on tree block of root > 6403, > it means, if it's a real corruption, it will only disturb you(make > fs=C2=A0 > suddenly RO) when you try to modify something(leaves under that node) > in=C2=A0 > that subvolume. Ah... and it couldn't cause corruption to the same data blocks if they were used by another snaphshot? > And I highly suspect if the subvolume 6403 is the RO snapshot you > just=C2=A0removed. I guess there is no way to find out whether it was that snapshot, is there? > If 'btrfs subvolume list' can't find that subvolume, then I think > it's=C2=A0 > mostly OK for you to RW mount and wait the subvolume to be fully > deleted. > > And I think you have already provided enough data for us to, at > least=C2=A0 > try to, reproduce the bug. I won't do the remount,rw this night, so you have the rest of your day/night time to think of anything further I should test or provide you with from that fs... then it will be "gone" (in the sense of mounted RW). Just give your veto if I should wait :) Thanks, Chris. --=-dg/P2nRurwcMhZdBZmee Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCCEmow ggXiMIIDyqADAgECAhBctkhuRwyYxn/2gNtkSuKNMA0GCSqGSIb3DQEBCwUAMH0xCzAJBgNVBAYT AklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0 aWZpY2F0ZSBTaWduaW5nMSkwJwYDVQQDEyBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 eTAeFw0xNTEyMTYwMTAwMDVaFw0zMDEyMTYwMTAwMDVaMHUxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSkwJwYDVQQLEyBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 eTEjMCEGA1UEAxMaU3RhcnRDb20gQ2xhc3MgMiBDbGllbnQgQ0EwggEiMA0GCSqGSIb3DQEBAQUA A4IBDwAwggEKAoIBAQDuD1CMlQkjhKz1UGqP1jeiTiH9MgllRz6vOPrVG/eE0H/J4QQLV/PeL8RT 4xc44bEzsoJu0IhwnEchb+TxE/qw88w7hxODuw3N8Faxix6a1jp83+RWvZHZf78+O+3GYBpekZfT Oe9A/FoTXbcgwZfLTMQodn+ckNnX31M/1M2f2/7VA7QBlvihontyHQOlIlryQXnGI0UMCD21oopK 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