From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:33125 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752026AbbBLJQR (ORCPT ); Thu, 12 Feb 2015 04:16:17 -0500 Date: Thu, 12 Feb 2015 17:16:04 +0800 From: Liu Bo To: Tobias Holst Cc: "linux-btrfs@vger.kernel.org" Subject: Re: Repair broken btrfs raid6? Message-ID: <20150212091603.GE2416@localhost.localdomain> Reply-To: bo.li.liu@oracle.com References:

MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, Feb 11, 2015 at 03:46:33PM +0100, Tobias Holst wrote: > Hmm, it looks like it is getting worse... Here are some parts of my > syslog, including two crashed btrfs-threads: > > So I am still getting many of these: > > BTRFS (device dm-5): parent transid verify failed on 25033166798848 wanted 108976 found 108958 > > BTRFS warning (device dm-5): page private not zero on page 25033166798848 > > BTRFS warning (device dm-5): page private not zero on page 25033166802944 > > BTRFS warning (device dm-5): page private not zero on page 25033166807040 > > BTRFS warning (device dm-5): page private not zero on page 25033166811136 First we probably make sure that your device is well setup, since these messages usually occur after a drive is removed(the device is somehow droping writes), the below -EIO also implies btrfs cannot read/write data from or to that drive. And in theory, RAID6 can tolerate two drive failures, so what's your mkfs.btrfs option? Thanks, -liubo > > BTRFS info (device dm-5): force lzo compression > > BTRFS info (device dm-5): disk space caching is enabled > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > BTRFS: dm-5 checksum verify failed on 30525304061952 wanted 55270A94 found B18E3934 level 0 > > Then there is this crash of "super"/btrfs_abort_transaction: > > ------------[ cut here ]------------ > > WARNING: CPU: 0 PID: 30526 at /home/kernel/COD/linux/fs/btrfs/super.c:260 __btrfs_abort_transaction+0x5f/0x140 [btrfs]() > > BTRFS: Transaction aborted (error -5) > > Modules linked in: ufs(E) qnx4(E) hfsplus(E) hfs(E) minix(E) ntfs(E) msdos(E) jfs(E) xfs(E) libcrc32c(E) btrfs(E) xor(E) raid6_pq(E) iosf_mbi(E) dm_crypt(E) kvm_intel(E) kvm(E) crct10dif_pclmul(E) crc32_pclmul(E) ppdev(E) ghash_clmulni_intel(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) 8250_fintek(E) serio_raw(E) virtio_rng(E) parport_pc(E) mac_hid(E) pvpanic(E) i2c_piix4(E) lp(E) parport(E) cirrus(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) ttm(E) mpt2sas(E) drm_kms_helper(E) raid_class(E) floppy(E) psmouse(E) drm(E) scsi_transport_sas(E) > > CPU: 0 PID: 30526 Comm: kworker/u16:6 Tainted: G W E 3.19.0-031900-generic #201502091451 > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > > Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs] > > 0000000000000104 ffff880002743c18 ffffffff817c4c00 0000000000000007 > > ffff880002743c68 ffff880002743c58 ffffffff81076e87 ffff880002743c58 > > ffff88020a8694d0 ffff8801fb715800 00000000fffffffb 0000000000000ae8 > > Call Trace: > > [] dump_stack+0x45/0x57 > > [] warn_slowpath_common+0x97/0xe0 > > [] warn_slowpath_fmt+0x46/0x50 > > [] __btrfs_abort_transaction+0x5f/0x140 [btrfs] > > [] btrfs_run_delayed_refs.part.82+0x175/0x290 [btrfs] > > [] btrfs_run_delayed_refs+0x17/0x20 [btrfs] > > [] delayed_ref_async_start+0x37/0x90 [btrfs] > > [] normal_work_helper+0x7e/0x1b0 [btrfs] > > [] btrfs_extent_refs_helper+0x12/0x20 [btrfs] > > [] process_one_work+0x14d/0x460 > > [] worker_thread+0x11b/0x3f0 > > [] ? create_worker+0x1e0/0x1e0 > > [] kthread+0xc9/0xe0 > > [] ? flush_kthread_worker+0x90/0x90 > > [] ret_from_fork+0x7c/0xb0 > > [] ? flush_kthread_worker+0x90/0x90 > > ---[ end trace dd65465954546462 ]--- > > BTRFS: error (device dm-5) in btrfs_run_delayed_refs:2792: errno=-5 IO failure > > BTRFS info (device dm-5): forced readonly > > and this crash of "delayed-ref"/btrfs_select_ref_head: > > ------------[ cut here ]------------ > > WARNING: CPU: 7 PID: 3159 at /home/kernel/COD/linux/fs/btrfs/delayed-ref.c:438 btrfs_select_ref_head+0x120/0x130 [btrfs]() > > Modules linked in: ufs(E) qnx4(E) hfsplus(E) hfs(E) minix(E) ntfs(E) msdos(E) jfs(E) xfs(E) libcrc32c(E) btrfs(E) xor(E) raid6_pq(E) iosf_mbi(E) dm_crypt(E) kvm_intel(E) kvm(E) crct10dif_pclmul(E) crc32_pclmul(E) ppdev(E) ghash_clmulni_intel(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) 8250_fintek(E) serio_raw(E) virtio_rng(E) parport_pc(E) mac_hid(E) pvpanic(E) i2c_piix4(E) lp(E) parport(E) cirrus(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) ttm(E) mpt2sas(E) drm_kms_helper(E) raid_class(E) floppy(E) psmouse(E) drm(E) scsi_transport_sas(E) > > CPU: 7 PID: 3159 Comm: btrfs-transacti Tainted: G W E 3.19.0-031900-generic #201502091451 > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > > 00000000000001b6 ffff8801cb687c48 ffffffff817c4c00 0000000000000007 > > 0000000000000000 ffff8801cb687c88 ffffffff81076e87 0000000000000001 > > ffff8801fe80bf00 0000000000000000 ffff8801fe80bfc8 ffff8802345d8280 > > Call Trace: > > [] dump_stack+0x45/0x57 > > [] warn_slowpath_common+0x97/0xe0 > > [] warn_slowpath_null+0x1a/0x20 > > [] btrfs_select_ref_head+0x120/0x130 [btrfs] > > [] __btrfs_run_delayed_refs+0x1e1/0x5f0 [btrfs] > > [] btrfs_run_delayed_refs.part.82+0x6a/0x290 [btrfs] > > [] ? join_transaction.isra.31+0x13c/0x380 [btrfs] > > [] btrfs_run_delayed_refs+0x17/0x20 [btrfs] > > [] btrfs_commit_transaction+0xb0/0xa70 [btrfs] > > [] transaction_kthread+0x1d5/0x250 [btrfs] > > [] ? open_ctree+0x1f40/0x1f40 [btrfs] > > [] kthread+0xc9/0xe0 > > [] ? flush_kthread_worker+0x90/0x90 > > [] ret_from_fork+0x7c/0xb0 > > [] ? flush_kthread_worker+0x90/0x90 > > ---[ end trace dd65465954546463 ]--- > > BTRFS warning (device dm-5): Skipping commit of aborted transaction. > > BTRFS: error (device dm-5) in cleanup_transaction:1670: errno=-5 IO failure > > > Any thoughts? Would it help to unplug the "dm5"-device which seems to > be causing this errors and then balance the array? > > Regards, > Tobias > > 2015-02-09 23:45 GMT+01:00 Tobias Holst : > > Hi > > > > I'm having some trouble with my six-drives btrfs raid6 (each drive > > encrypted with LUKS). At first: Yes, I do have backups, but it may > > take at least days, maybe weeks or even some month to restore > > everything from the (offside) backups. So it is not essential to > > recover the data, but would be great ;-) > > > > OS: Ubuntu 14.04 > > Kernel: 3.19.0 > > btrfs-progs: 3.19-rc2 > > > > When booting my server I am getting this in the syslog: > >> [ 8.026362] BTRFS: device label tobby-btrfs devid 3 transid 108721 /dev/dm-0 > >> [ 8.118896] BTRFS: device label tobby-btrfs devid 6 transid 108721 /dev/dm-1 > >> [ 8.202477] BTRFS: device label tobby-btrfs devid 1 transid 108721 /dev/dm-2 > >> [ 8.520988] BTRFS: device label tobby-btrfs devid 4 transid 108721 /dev/dm-3 > >> [ 8.555570] BTRFS info (device dm-3): force lzo compression > >> [ 8.555574] BTRFS info (device dm-3): disk space caching is enabled > >> [ 8.556310] BTRFS: failed to read the system array on dm-3 > >> [ 8.592135] BTRFS: open_ctree failed > >> [ 9.039187] BTRFS: device label tobby-btrfs devid 2 transid 108721 /dev/dm-4 > >> [ 9.107779] BTRFS: device label tobby-btrfs devid 5 transid 108721 /dev/dm-5 > > Looks like there is something wrong on drive 3, giving me "open_ctree > > failed". I have to press "S" to skip mounting of the btrfs volume. It > > boots and with "sudo mount --all" I can successfully mount the btrfs > > volume. Sometimes it takes one or two minutes but it will mount. > > > > After a while I am sometimes/randomly getting this in the syslog: > >> [ 1161.283246] BTRFS: dm-5 checksum verify failed on 39099619901440 wanted BB5B0AD5 found 6B6F5040 level 0 > > Looks like something else is broken on dm-5... But shouldn't this be > > repaired with the new raid56-repair-features of kernel 3.19? > > > > After some more time I am getting this: > >> [637017.631044] BTRFS (device dm-4): parent transid verify failed on 39099305132032 wanted 108722 found 108719 > > Then it is not possible to access the mounted volume anymore. I have > > to "umount -l" to unmount it and then I can remount it. Until it > > happens again (after some time)... > > > > I also tried a balance and a scrub but they "crash". Syslog is full of > > messages like the following examples: > >> [ 3355.523157] csum_tree_block: 53 callbacks suppressed > >> [ 3355.523160] BTRFS: dm-5 checksum verify failed on 39099306917888 wanted F90D8231 found 5981C697 level 0 > >> [ 4006.935632] BTRFS (device dm-5): parent transid verify failed on 30525418536960 wanted 108975 found 108767 > > and "btrfs scrub status /[device]" gives me the following output: > >> "scrub status for [UUID] > >> scrub started at Mon Feb 9 18:16:38 2015 and was aborted after 2008 seconds > >> total bytes scrubbed: 113.04GiB with 0 errors" > > > > So a short summary: > > - btrfs raid6 on 3.19.0 with btrfs-progs 3.19-rc2 > > - does not mount at boot up, "open_ctree failed" (disk 3) > > - mounts successfully after bootup > > - randomly "checksum verify failed" (disk 5) > > - balance and scrub crash after some time > > - after a while the volume gets unreadable, saying "parent transid > > verify failed" (disk 4 or 5) > > > > And it looks like there still is no way to btrfsck a raid6. > > > > Any ideas how to repair this filesystem? > > > > Regards, > > Tobias > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html