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 ]---
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