Hi,
One of my disks, partitioned into a single btrfs partition, is showing
media errors. The problem is that these errors lead to kernel panic from
btrfs - that make the filesystem unusable until reboot - and therefore
it is very hard for me to do a full backup of the data prior to changing
the disk.
My current kernel is 3.2.0-8-generic from Ubuntu/precise (based on linux
3.2-final) but I quickly tested and get the same error with an older 3.1
kernel (and I can probably reproduce it with a vanilla kernel if necessary).
I assume that the filesystem should not panic even in case of a media
error... Is there any procedure I can follow / patch I could apply to
salvage my data while ignoring media errors ?
logs/OOPS at the end of this mail, please let me know if more
information is needed,
Best regards,
Vincent
-----------------------------------------------------------------------
[ 129.241636] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 129.241640] ata6.00: BMDMA stat 0x24
[ 129.241643] ata6.00: failed command: READ DMA EXT
[ 129.241649] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 129.241651] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 129.241654] ata6.00: status: { DRDY ERR }
[ 129.241656] ata6.00: error: { UNC }
[ 129.256243] ata6.00: configured for UDMA/133
[ 129.256261] ata6: EH complete
[ 131.640911] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 131.640915] ata6.00: BMDMA stat 0x24
[ 131.640918] ata6.00: failed command: READ DMA EXT
[ 131.640922] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 131.640923] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 131.640926] ata6.00: status: { DRDY ERR }
[ 131.640927] ata6.00: error: { UNC }
[ 131.656244] ata6.00: configured for UDMA/133
[ 131.656260] ata6: EH complete
[ 134.317351] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 134.317355] ata6.00: BMDMA stat 0x24
[ 134.317359] ata6.00: failed command: READ DMA EXT
[ 134.317365] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 134.317366] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 134.317369] ata6.00: status: { DRDY ERR }
[ 134.317371] ata6.00: error: { UNC }
[ 134.332234] ata6.00: configured for UDMA/133
[ 134.332248] ata6: EH complete
[ 136.894260] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 136.894264] ata6.00: BMDMA stat 0x24
[ 136.894268] ata6.00: failed command: READ DMA EXT
[ 136.894274] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 136.894275] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 136.894278] ata6.00: status: { DRDY ERR }
[ 136.894280] ata6.00: error: { UNC }
[ 136.924255] ata6.00: configured for UDMA/133
[ 136.924269] ata6: EH complete
[ 139.437990] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 139.437994] ata6.00: BMDMA stat 0x24
[ 139.437998] ata6.00: failed command: READ DMA EXT
[ 139.438004] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 139.438005] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 139.438008] ata6.00: status: { DRDY ERR }
[ 139.438010] ata6.00: error: { UNC }
[ 139.468239] ata6.00: configured for UDMA/133
[ 139.468253] ata6: EH complete
[ 141.937488] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 141.937493] ata6.00: BMDMA stat 0x24
[ 141.937497] ata6.00: failed command: READ DMA EXT
[ 141.937503] ata6.00: cmd 25/00:08:5f:dc:2f/00:00:70:00:00/e0 tag
0 dma 4096 in
[ 141.937504] res 51/40:00:61:dc:2f/40:00:70:00:00/e0
Emask 0x9 (media error)
[ 141.937507] ata6.00: status: { DRDY ERR }
[ 141.937509] ata6.00: error: { UNC }
[ 141.952236] ata6.00: configured for UDMA/133
[ 141.952253] sd 5:0:0:0: [sdd] Unhandled sense code
[ 141.952256] sd 5:0:0:0: [sdd] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 141.952260] sd 5:0:0:0: [sdd] Sense Key : Medium Error [current]
[descriptor]
[ 141.952264] Descriptor sense data with sense descriptors (in hex):
[ 141.952266] 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
[ 141.952275] 70 2f dc 61
[ 141.952279] sd 5:0:0:0: [sdd] Add. Sense: Unrecovered read error
- auto reallocate failed
[ 141.952284] sd 5:0:0:0: [sdd] CDB: Read(10): 28 00 70 2f dc 5f 00
00 08 00
[ 141.952293] end_request: I/O error, dev sdd, sector 1882184801
[ 141.952313] ata6: EH complete
[ 141.952335] BUG: unable to handle kernel NULL pointer dereference
at (null)
[ 141.952383] IP: [<ffffffffa018e439>]
extent_range_uptodate+0x59/0xe0 [btrfs]
[ 141.952440] PGD 21caae067 PUD 221e55067 PMD 0
[ 141.952466] Oops: 0000 [#1] SMP
[ 141.952485] CPU 1
[ 141.952496] Modules linked in: ip6table_filter ip6_tables rfcomm
bnep bluetooth ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM
iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge
stp kvm_intel kvm parport_pc ppdev nfsd nfs lockd fscache
auth_rpcgss nfs_acl sunrpc binfmt_misc dm_crypt snd_usb_audio
snd_usbmidi_lib joydev snd_hda_codec_realtek snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi
snd_seq_midi_event snd_seq snd_timer snd_seq_device snd psmouse
soundcore snd_page_alloc serio_raw lp parport btrfs zlib_deflate
libcrc32c hid_logitech ff_memless usbhid hid i915 r8169
drm_kms_helper drm i2c_algo_bit video pata_jmicron
[ 141.952823]
[ 141.952830] Pid: 945, comm: btrfs-endio-met Not tainted
3.2.0-8-generic #14-Ubuntu Gigabyte Technology Co., Ltd.
G33-DS3R/G33-DS3R
[ 141.952873] RIP: 0010:[<ffffffffa018e439>]
[<ffffffffa018e439>]
extent_range_uptodate+0x59/0xe0 [btrfs]
[ 141.952916] RSP: 0018:ffff88021ca0fde0 EFLAGS: 00010246
[ 141.952936] RAX: 0000000000000000 RBX: 000000df57385000 RCX:
0000000000000000
[ 141.952960] RDX: 0000000000000001 RSI: 000000000df57385 RDI:
0000000000000000
[ 141.952984] RBP: ffff88021ca0fe00 R08: 0000000000000000 R09:
ffff8801c8065200
[ 141.953008] R10: ffff8801c8d03010 R11: 0000000000001000 R12:
ffff8802182fc030
[ 141.953032] R13: 000000df573853ff R14: ffff88022121dc40 R15:
ffff88022154e590
[ 141.953057] FS: 0000000000000000(0000) GS:ffff88022fc80000(0000)
knlGS:0000000000000000
[ 141.953085] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 141.953104] CR2: 0000000000000000 CR3: 000000021f8d9000 CR4:
00000000000406e0
[ 141.953128] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 141.953152] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 141.953176] Process btrfs-endio-met (pid: 945, threadinfo
ffff88021ca0e000, task ffff88022121dc40)
[ 141.953207] Stack:
[ 141.953215] ffff88021ca0fdf0 ffff8801d310d638 ffff8801d2c73f00
ffff88021f526000
[ 141.953245] ffff88021ca0fe10 ffffffffa016824d ffff88021ca0fe40
ffffffffa01682d6
[ 141.953275] ffff88021ca0fe88 ffff88022154e540 ffff88021ca0fe88
ffff88021ca0fe98
[ 141.953304] Call Trace:
[ 141.953323] [<ffffffffa016824d>]
bio_ready_for_csum.isra.108+0xbd/0xc0 [btrfs]
[ 141.953356] [<ffffffffa01682d6>] end_workqueue_fn+0x86/0xa0
[btrfs]
[ 141.953388] [<ffffffffa01974e0>] worker_loop+0xa0/0x2b0 [btrfs]
[ 141.953413] [<ffffffff8164fb2c>] ? __schedule+0x3cc/0x6f0
[ 141.953442] [<ffffffffa0197440>] ?
check_pending_worker_creates.isra.2+0xf0/0xf0 [btrfs]
[ 141.953472] [<ffffffff8108833c>] kthread+0x8c/0xa0
[ 141.953491] [<ffffffff8165c734>] kernel_thread_helper+0x4/0x10
[ 141.953513] [<ffffffff810882b0>] ? flush_kthread_worker+0xa0/0xa0
[ 141.953535] [<ffffffff8165c730>] ? gs_change+0x13/0x13
[ 141.953553] Code: 01 f0 48 09 f0 a9 ff 0f 00 00 75 4e 49 39 dd b8
01 00 00 00 72 36 0f 1f 40 00 49 8b 7c 24 18 48 89 de 48 c1 ee 0c e8
b7 86 f8 e0 <48> 8b 10 83 e2 08 74 5f 48 89 c7 48 81 c3 00 10 00 00
e8 40 43
[ 141.953697] RIP [<ffffffffa018e439>]
extent_range_uptodate+0x59/0xe0 [btrfs]
[ 141.953738] RSP <ffff88021ca0fde0>
[ 141.953750] CR2: 0000000000000000
[ 142.018534] ---[ end trace 1d226c0f6e9b247e ]---
--
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
Niels de Carpentier
2012-Jan-09 23:01 UTC
Re: btrfs-related kernel oops due to media error
> Hi, > > One of my disks, partitioned into a single btrfs partition, is showing > media errors. The problem is that these errors lead to kernel panic from > btrfs - that make the filesystem unusable until reboot - and therefore > it is very hard for me to do a full backup of the data prior to changing > the disk. > My current kernel is 3.2.0-8-generic from Ubuntu/precise (based on linux > 3.2-final) but I quickly tested and get the same error with an older 3.1 > kernel (and I can probably reproduce it with a vanilla kernel if > necessary). > I assume that the filesystem should not panic even in case of a media > error... Is there any procedure I can follow / patch I could apply to > salvage my data while ignoring media errors ?I don''t know about btrfs, but writing the sector with hdparm --write-sector will usually cause it to be remapped. You can use dd or another tool to read the entire disk to find out if there are more bad sectors. Niels -- 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
On Tue, Jan 10, 2012 at 00:01, Niels de Carpentier
<niels@decarpentier.com <mailto:niels@decarpentier.com>> wrote:
> Hi,
>
> One of my disks, partitioned into a single btrfs partition, is
showing
> media errors. The problem is that these errors lead to kernel
panic from
> btrfs - that make the filesystem unusable until reboot - and
therefore
> it is very hard for me to do a full backup of the data prior to
changing
> the disk.
> My current kernel is 3.2.0-8-generic from Ubuntu/precise (based
on linux
> 3.2-final) but I quickly tested and get the same error with an
older 3.1
> kernel (and I can probably reproduce it with a vanilla kernel if
> necessary).
> I assume that the filesystem should not panic even in case of a media
> error... Is there any procedure I can follow / patch I could apply to
> salvage my data while ignoring media errors ?
I don''t know about btrfs, but writing the sector with hdparm
--write-sector will usually cause it to be remapped. You can use dd or
another tool to read the entire disk to find out if there are more bad
sectors.
Niels
Thanks you for the hint !
I''ll probably try this but since I''ve already managed to make
a copy of
all my interesting data, I think I''ll keep the disk in the same state
(with the bad sectors not remapped) for a few days, hoping the btrfs
developers are interested in fixing this bug... Who will trust a
filesystem that OOPs on media failure ? ;-)
Vincent
--
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