You _need_ to use a recent kernel; 2.6.32 is nearly 3 years old, which is prehistoric in btrfs terms.
It may Just Work in 3.5; if it doesn't, try 3.5 with -o recovery. On Fri, Aug 24, 2012 at 2:30 PM, Stefan Harwarth <mailingli...@harwarth.de> wrote: > Hi btrfs people, > > I've been using btrfs for 2 months or so. After an incident where apparently > my eSATA connection got lost (according to syslog, see end of mail), the > partition cannot be mounted anymore. Even worse, all btrfs tools report > there is no btrfs filesystem on the partition (and parted/gdisk/... all show > no filesystem indication at all for the partition). I have included the > syslog excerpts from when the error happened and the syslog when I first > retried to mount the volume. > > I took a look at the raw data in the partition (dd if=/dev/sdb1 ...) and - > which is not a good sign, I guess - the first non-null Bytes are around 6,4 > MB from the start of the partition, and they do not look like file system > information but more like a windows ISO which was stored on the drive. The > HDD does not report any damages in the SMART-report. > > Is there any chance to get the data back from the drive? It won't kill me if > it's lost, but recovery would save me a hell lot of work. > > Thanks in advance, > > Stefan > > First syslog when the error occured: > > Aug 9 05:30:26 debian kernel: [23735.292560] sda: detected capacity change > from 2000398934016 to 0 > Aug 9 05:31:50 debian kernel: [23819.504883] lost page write due to I/O > error on sda1 > Aug 9 05:31:50 debian kernel: [23819.504944] lost page write due to I/O > error on sda1 > Aug 9 05:31:50 debian kernel: [23819.505007] end_request: I/O error, dev > sda, sector 536872960 > Aug 9 05:31:50 debian kernel: [23819.505049] lost page write due to I/O > error on sda1 > Aug 9 05:31:50 debian kernel: [23819.505058] btrfs: 1 errors while writing > supers > Aug 9 05:31:50 debian kernel: [23819.505128] ------------[ cut here > ]------------ > Aug 9 05:31:50 debian kernel: [23819.505164] kernel BUG at > /build/buildd-linux-2.6_2.6.32-45-i386-yQfQSv/linux-2.6-2.6.32/debian/build/source_i386_none/fs/btrfs/disk-io.c:2302! > Aug 9 05:31:50 debian kernel: [23819.505243] invalid opcode: 0000 [#1] SMP > Aug 9 05:31:50 debian kernel: [23819.505281] last sysfs file: > /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/PNP0C0A:00/power_supply/BAT0/energy_full > Aug 9 05:31:50 debian kernel: [23819.505356] Modules linked in: btrfs > zlib_deflate crc32c libcrc32c loop joydev i915 drm_kms_helper pcmcia > thinkpad_acpi rfkill drm parport_pc snd_intel8x0 snd_ac97_codec ac97_bus > led_class yenta_socket i2c_algo_bit snd_pcm i2c_i801 parport rsrc_nonstatic > psmouse serio_raw snd_timer video pcmcia_core nvram pcspkr i2c_core output > evdev snd rng_core soundcore battery ac processor button snd_page_alloc ext3 > jbd mbcache ata_generic sd_mod crc_t10dif ata_piix uhci_hcd ahci sata_sil24 > tg3 thermal ehci_hcd usbcore libata scsi_mod libphy thermal_sys nls_base > [last unloaded: scsi_wait_scan] > Aug 9 05:31:50 debian kernel: [23819.505772] > Aug 9 05:31:50 debian kernel: [23819.505803] Pid: 775, comm: > btrfs-transacti Not tainted (2.6.32-5-686 #1) 18714AG > Aug 9 05:31:50 debian kernel: [23819.505865] EIP: 0060:[<f8a27a8d>] EFLAGS: > 00010282 CPU: 0 > Aug 9 05:31:50 debian kernel: [23819.505935] EIP is at > write_all_supers+0x20f/0x21f [btrfs] > Aug 9 05:31:50 debian kernel: [23819.505973] EAX: 0000003a EBX: f6f47658 > ECX: f6773f18 EDX: f8a5e117 > Aug 9 05:31:50 debian kernel: [23819.506014] ESI: 00000001 EDI: 00000003 > EBP: f6d22000 ESP: f6773f14 > Aug 9 05:31:50 debian kernel: [23819.506054] DS: 007b ES: 007b FS: 00d8 > GS: 00e0 SS: 0068 > Aug 9 05:31:50 debian kernel: [23819.506095] Process btrfs-transacti (pid: > 775, ti=f6772000 task=f6495980 task.ti=f6772000) > Aug 9 05:31:50 debian kernel: [23819.506157] Stack: > Aug 9 05:31:50 debian kernel: [23819.506184] f8a5e117 00000001 00000000 > f66bd800 f6f47658 f6d22c2f 00000001 00000000 > Aug 9 05:31:50 debian kernel: [23819.506239] <0> 00000000 f6d22d3a f6d22d4a > f6f47600 f6991030 f6d22c2f f6d2375a f66bd800 > Aug 9 05:31:50 debian kernel: [23819.506316] <0> f8a2a868 f6991030 f6b2d04c > 00000003 00000000 00000000 f6b2d064 f6b2d000 > Aug 9 05:31:50 debian kernel: [23819.506412] Call Trace: > Aug 9 05:31:50 debian kernel: [23819.506473] [<f8a2a868>] ? > btrfs_commit_transaction+0x4c0/0x5a1 [btrfs] > Aug 9 05:31:50 debian kernel: [23819.506523] [<c104432e>] ? > autoremove_wake_function+0x0/0x2d > Aug 9 05:31:50 debian kernel: [23819.506588] [<f8a26805>] ? > transaction_kthread+0x133/0x19e [btrfs] > Aug 9 05:31:50 debian kernel: [23819.506634] [<c1024a6f>] ? > complete+0x28/0x36 > Aug 9 05:31:50 debian kernel: [23819.506696] [<f8a266d2>] ? > transaction_kthread+0x0/0x19e [btrfs] > Aug 9 05:31:50 debian kernel: [23819.506739] [<c10440fc>] ? > kthread+0x61/0x66 > Aug 9 05:31:50 debian kernel: [23819.506777] [<c104409b>] ? > kthread+0x0/0x66 > Aug 9 05:31:50 debian kernel: [23819.506816] [<c1003d47>] ? > kernel_thread_helper+0x7/0x10 > Aug 9 05:31:50 debian kernel: [23819.506853] Code: 75 c4 8b 54 24 04 8b 82 > 14 01 00 00 8b 80 b8 1c 00 00 83 c0 44 e8 3f 6b 84 c8 3b 74 24 14 7e 11 56 > 68 17 e1 a5 f8 e8 18 5c 84 c8 <0f> 0b 58 5a eb fe 83 c4 28 31 c0 5b 5e 5f 5d > c3 89 d0 89 ca e9 > Aug 9 05:31:50 debian kernel: [23819.507072] EIP: [<f8a27a8d>] > write_all_supers+0x20f/0x21f [btrfs] SS:ESP 0068:f6773f14 > Aug 9 05:31:50 debian kernel: [23819.507474] ---[ end trace > 31cd148f196f7433 ]--- > > > Second syslog when I first tried to remount the drive: > > Aug 13 23:59:00 debian kernel: [435848.980197] BUG: unable to handle kernel > NULL pointer dereference at 0000001c > Aug 13 23:59:00 debian kernel: [435848.980269] IP: [<f8a21d84>] > btrfs_print_leaf+0xe/0x765 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.980341] *pde = 00000000 > Aug 13 23:59:00 debian kernel: [435848.980374] Oops: 0000 [#2] SMP > Aug 13 23:59:00 debian kernel: [435848.980410] last sysfs file: > /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/PNP0C0A:00/power_supply/BAT0/energy_full > Aug 13 23:59:00 debian kernel: [435848.980486] Modules linked in: btrfs > zlib_deflate crc32c libcrc32c loop joydev i915 drm_kms_helper pcmcia > thinkpad_acpi rfkill drm parport_pc snd_intel8x0 snd_ac97_codec ac97_bus > led_class yenta_socket i2c_algo_bit snd_pcm i2c_i801 parport rsrc_nonstatic > psmouse serio_raw snd_timer video pcmcia_core nvram pcspkr i2c_core output > evdev snd rng_core soundcore battery ac processor button snd_page_alloc ext3 > jbd mbcache ata_generic sd_mod crc_t10dif ata_piix uhci_hcd ahci sata_sil24 > tg3 thermal ehci_hcd usbcore libata scsi_mod libphy thermal_sys nls_base > [last unloaded: scsi_wait_scan] > Aug 13 23:59:00 debian kernel: [435848.980901] > Aug 13 23:59:00 debian kernel: [435848.980931] Pid: 8795, comm: umount > Tainted: G D (2.6.32-5-686 #1) 18714AG > Aug 13 23:59:00 debian kernel: [435848.980995] EIP: 0060:[<f8a21d84>] > EFLAGS: 00010292 CPU: 0 > Aug 13 23:59:00 debian kernel: [435848.981057] EIP is at > btrfs_print_leaf+0xe/0x765 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.981095] EAX: f66be800 EBX: f66be800 > ECX: c1ba0140 EDX: 00000000 > Aug 13 23:59:00 debian kernel: [435848.981135] ESI: 00000000 EDI: f69f4000 > EBP: 00000000 ESP: f629fcdc > Aug 13 23:59:00 debian kernel: [435848.981176] DS: 007b ES: 007b FS: 00d8 > GS: 00e0 SS: 0068 > Aug 13 23:59:00 debian kernel: [435848.981216] Process umount (pid: 8795, > ti=f629e000 task=f60b9540 task.ti=f629e000) > Aug 13 23:59:00 debian kernel: [435848.981276] Stack: > Aug 13 23:59:00 debian kernel: [435848.981304] 00000000 00000000 00000000 > 00000086 8777d000 f69f4000 f66be800 f6802c00 > Aug 13 23:59:00 debian kernel: [435848.981359] <0> f28c0d40 b7766000 > c108c611 ffffffff 000000b0 0000000b 00000001 00000000 > Aug 13 23:59:00 debian kernel: [435848.981436] <0> 868777d0 a8000000 > 00001000 00000000 00000005 00000000 f69f4000 00000000 > Aug 13 23:59:00 debian kernel: [435848.981532] Call Trace: > Aug 13 23:59:00 debian kernel: [435848.981572] [<c108c611>] ? > __alloc_pages_nodemask+0xf3/0x4d9 > Aug 13 23:59:00 debian kernel: [435848.981636] [<f8a1eb7d>] ? > __btrfs_free_extent+0xe3/0x743 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.981700] [<f8a1ed9d>] ? > __btrfs_free_extent+0x303/0x743 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.981765] [<f8a1f6a7>] ? > run_one_delayed_ref+0x4ca/0x4df [btrfs] > Aug 13 23:59:00 debian kernel: [435848.981811] [<c1001f10>] ? > __switch_to+0xcf/0x141 > Aug 13 23:59:00 debian kernel: [435848.981872] [<f8a215e9>] ? > run_clustered_refs+0x1f2/0x22d [btrfs] > Aug 13 23:59:00 debian kernel: [435848.981938] [<f8a216d9>] ? > btrfs_run_delayed_refs+0xb5/0x138 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.982007] [<f8a2a411>] ? > btrfs_commit_transaction+0x69/0x5a1 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.982077] [<f8a2a118>] ? > start_transaction+0x19/0x110 [btrfs] > Aug 13 23:59:00 debian kernel: [435848.983197] [<c104432e>] ? > autoremove_wake_function+0x0/0x2d > Aug 13 23:59:00 debian kernel: [435848.983241] [<c10e4d02>] ? > sync_quota_sb+0x3a/0xca > Aug 13 23:59:00 debian kernel: [435848.983282] [<c10ccd78>] ? > __sync_filesystem+0x3a/0x60 > Aug 13 23:59:00 debian kernel: [435848.983325] [<c10b5513>] ? > generic_shutdown_super+0x19/0xc6 > Aug 13 23:59:00 debian kernel: [435848.983367] [<c10e3e16>] ? > vfs_quota_off+0x0/0xd > Aug 13 23:59:00 debian kernel: [435848.983406] [<c10b55f5>] ? > kill_anon_super+0x9/0x3b > Aug 13 23:59:00 debian kernel: [435848.983446] [<c10b5b77>] ? > deactivate_super+0x4a/0x5f > Aug 13 23:59:00 debian kernel: [435848.983488] [<c10c5b5b>] ? > sys_umount+0x2a5/0x2cb > Aug 13 23:59:00 debian kernel: [435848.983528] [<c10c5b8c>] ? > sys_oldumount+0xb/0xe > Aug 13 23:59:00 debian kernel: [435848.983567] [<c10030fb>] ? > sysenter_do_call+0x12/0x28 > Aug 13 23:59:00 debian kernel: [435848.983603] Code: 24 08 ff 74 24 18 ff 74 > 24 18 52 50 68 03 d7 a5 f8 e8 36 b9 84 c8 83 c4 30 5b 5e 5f c3 55 89 d5 57 > 56 53 89 c3 81 ec 88 00 00 00 <8b> 42 1c ba 03 00 00 00 e8 52 db 5f c8 8b 50 > 60 89 54 24 20 ba > Aug 13 23:59:00 debian kernel: [435848.983823] EIP: [<f8a21d84>] > btrfs_print_leaf+0xe/0x765 [btrfs] SS:ESP 0068:f629fcdc > Aug 13 23:59:00 debian kernel: [435848.983914] CR2: 000000000000001c > Aug 13 23:59:00 debian kernel: [435848.984328] ---[ end trace > 31cd148f196f7434 ]--- > > -- > Stefan Harwarth > 85051 Ingolstadt > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
