Hi,
I'm using a Linux 3.7.6 (Gentoo Linux) with btrfs-progs-0.20_rc1_p56 and since few days, I have some uncorrectable errors :
# btrfs scrub status /
scrub status for 6b6ea99b-edee-498d-bf07-f3a3f1cba2f3
scrub started at Thu Mar 7 20:12:31 2013 and finished after 515 seconds
total bytes scrubbed: 31.02GB with 6 errors
error details: csum=6
corrected errors: 0, uncorrectable errors: 6, unverified errors: 0
I don't know what has produced this error (maybe an hard reset or a power cut) but I use an old not-SSD hard-disk.
I have discovered this problem thanks to several errors in dmesg when I try to access to a file :
[ 2985.163718] btrfs: sda2 checksum verify failed on 26326409216 wanted 59A31CB1 found DFB0FE7F level 0
[ 2985.169191] btrfs: sda2 checksum verify failed on 26326409216 wanted 59A31CB1 found DFB0FE7F level 0
[ 2993.102810] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.114213] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.114527] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.114795] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.115097] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.115349] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.115585] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.115956] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.116260] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2993.116558] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2998.100230] csum_tree_block: 27408 callbacks suppressed
[ 2998.100233] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2998.100406] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
[ 2998.100591] btrfs: sda2 checksum verify failed on 272228352 wanted 1A0FCFD3 found 119281BE level 0
If I restart a btrfs scrub, I get these messages :
[ 3047.835131] btrfs: checksum error at logical 272228352 on dev /dev/sda2, sector 548080: metadata leaf (level 0) in tree 5
[ 3047.835134] btrfs: checksum error at logical 272228352 on dev /dev/sda2, sector 548080: metadata leaf (level 0) in tree 5
[ 3047.835137] btrfs: bdev /dev/sda2 errs: wr 0, rd 0, flush 0, corrupt 20, gen 0
[ 3047.953751] btrfs: unable to fixup (regular) error at logical 272228352 on dev /dev/sda2
[ 3052.349518] btrfs: checksum error at logical 556208128 on dev /dev/sda2, sector 1102728: metadata leaf (level 0) in tree 5
[ 3052.349521] btrfs: checksum error at logical 556208128 on dev /dev/sda2, sector 1102728: metadata leaf (level 0) in tree 5
[ 3052.349524] btrfs: bdev /dev/sda2 errs: wr 0, rd 0, flush 0, corrupt 21, gen 0
[ 3055.840357] btrfs: unable to fixup (regular) error at logical 556208128 on dev /dev/sda2
[ 3061.032879] btrfs: checksum error at logical 272228352 on dev /dev/sda2, sector 2645232: metadata leaf (level 0) in tree 5
[ 3061.032882] btrfs: checksum error at logical 272228352 on dev /dev/sda2, sector 2645232: metadata leaf (level 0) in tree 5
[ 3061.032885] btrfs: bdev /dev/sda2 errs: wr 0, rd 0, flush 0, corrupt 22, gen 0
[ 3063.014553] btrfs: unable to fixup (regular) error at logical 272228352 on dev /dev/sda2
[ 3067.758444] btrfs: checksum error at logical 556208128 on dev /dev/sda2, sector 3199880: metadata leaf (level 0) in tree 5
[ 3067.758447] btrfs: checksum error at logical 556208128 on dev /dev/sda2, sector 3199880: metadata leaf (level 0) in tree 5
[ 3067.758450] btrfs: bdev /dev/sda2 errs: wr 0, rd 0, flush 0, corrupt 23, gen 0
[ 3067.822206] btrfs: unable to fixup (regular) error at logical 556208128 on dev /dev/sda2
I tried a LiveCD to make a btrfsck [I have to check its version] but it segfaults during the test.
Today, I can't remove the file (and I can't delete its directory), updatedb runs during hours when it tries to read this file.
So, what is the best way to recover these errors (as I think that some files are definitely lost) ?
I would like to identify the corrupted files and to delete them.
Regards,
Frederic
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