OK so now I'm able to reproduce this with Fedora 20 alpha RC4 on a HDD, which
uses:
kernel-3.11.1-300.fc20.x86_64
btrfs-progs-0.20.rc1.20130917git194aa4a-1.fc20.x86_64
Since it's HDD, metadata profile DUP is used. But I still get munged checksums
with balance, and the corruption isn't fixable by a subsequent scrub. So even
though the data is probably OK and this is just a checksum problem, it's
apparently not fixable (?).
[root@oldlaptop ~]# btrfs balance start /
Done, had to relocate 5 out of 5 chunks
[root@oldlaptop ~]# dmesg (snippet)
[ 390.770699] btrfs: relocating block group 1103101952 flags 1
[ 406.639113] btrfs: found 10341 extents
[ 414.172873] btrfs: found 10331 extents
[ 414.530059] btrfs: relocating block group 29360128 flags 36
[ 418.761208] btrfs: found 9281 extents
[ 419.136338] btrfs: relocating block group 20971520 flags 34
[ 419.536539] btrfs: found 1 extents
[ 419.880757] btrfs: relocating block group 12582912 flags 1
[ 420.380511] btrfs: found 282 extents
[ 421.080667] btrfs: found 282 extents
[ 421.426891] btrfs: relocating block group 4194304 flags 4
[root@oldlaptop ~]# btrfs scrub start /
scrub started on /, fsid 1463a31b-472a-47cd-a8c8-86bf09f978fa (pid=894)
[root@oldlaptop ~]# dmesg (snippet)
[ 460.533990] btrfs: checksum error at logical 2607853568 on dev /dev/sda5,
sector 7207000, root 256, inode 24622, offset 4247552, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.534045] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 1, gen 0
[ 460.534082] btrfs: unable to fixup (regular) error at logical 2607853568 on
dev /dev/sda5
[ 460.534581] btrfs: checksum error at logical 2607869952 on dev /dev/sda5,
sector 7207032, root 256, inode 24622, offset 4263936, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.534594] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 2, gen 0
[ 460.534614] btrfs: unable to fixup (regular) error at logical 2607869952 on
dev /dev/sda5
[ 460.535128] btrfs: checksum error at logical 2607886336 on dev /dev/sda5,
sector 7207064, root 256, inode 24622, offset 4280320, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.535140] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 3, gen 0
[ 460.535161] btrfs: unable to fixup (regular) error at logical 2607886336 on
dev /dev/sda5
[ 460.535607] btrfs: checksum error at logical 2607902720 on dev /dev/sda5,
sector 7207096, root 256, inode 24622, offset 4296704, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.535619] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 4, gen 0
[ 460.535639] btrfs: unable to fixup (regular) error at logical 2607902720 on
dev /dev/sda5
[ 460.536421] btrfs: checksum error at logical 2608025600 on dev /dev/sda5,
sector 7207336, root 256, inode 24622, offset 4313088, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.536437] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 5, gen 0
[ 460.536457] btrfs: unable to fixup (regular) error at logical 2608025600 on
dev /dev/sda5
[ 460.779192] btrfs: checksum error at logical 2626674688 on dev /dev/sda5,
sector 7243760, root 256, inode 24622, offset 4595712, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.779210] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 6, gen 0
[ 460.779245] btrfs: unable to fixup (regular) error at logical 2626674688 on
dev /dev/sda5
[ 460.779822] btrfs: checksum error at logical 2626715648 on dev /dev/sda5,
sector 7243840, root 256, inode 24622, offset 4231168, length 4096, links 1
(path: var/log/journal/d212cf4a840f4e78a33781c56189a7da/system.journal)
[ 460.779834] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 7, gen 0
[ 460.779854] btrfs: unable to fixup (regular) error at logical 2626715648 on
dev /dev/sda5
And now on reboot:
[root@f20s ~]# dmesg | grep -i btrfs
[ 1.725224] Btrfs loaded
[ 1.980491] btrfs: disk space caching is enabled
[ 2.001684] btrfs: bdev /dev/sda5 errs: wr 0, rd 0, flush 0, corrupt 7, gen 0
[ 3.011628] SELinux: initialized (dev sda5, type btrfs), uses xattr
[ 5.092593] btrfs: disk space caching is enabled
[ 8.703883] btrfs no csum found for inode 24622 start 4235264
[ 8.844562] btrfs no csum found for inode 24622 start 4251648
[ 8.844589] btrfs no csum found for inode 24622 start 4272128
[ 8.844611] btrfs no csum found for inode 24622 start 4288512
[ 8.844632] btrfs no csum found for inode 24622 start 4304896
[ 8.844658] btrfs no csum found for inode 24622 start 4321280
[ 8.856069] BTRFS info (device sda5): csum failed ino 24622 off 4251648 csum
1113579642 private 0
[ 8.856084] BTRFS info (device sda5): csum failed ino 24622 off 4272128 csum
2433646103 private 0
[ 8.856092] BTRFS info (device sda5): csum failed ino 24622 off 4288512 csum
2276263411 private 0
[ 8.857248] BTRFS info (device sda5): csum failed ino 24622 off 4304896 csum
1156822344 private 0
[ 8.857424] BTRFS info (device sda5): csum failed ino 24622 off 4321280 csum
3967991073 private 0
[ 8.867242] BTRFS info (device sda5): csum failed ino 24622 off 4235264 csum
172180530 private 0
Other info:
[root@oldlaptop ~]# btrfs fi show
bfailed to open /dev/sr0: No medium found
Label: 'fedora' uuid: 1463a31b-472a-47cd-a8c8-86bf09f978fa
Total devices 1 FS bytes used 700.04MB
devid 1 size 432.62GB used 3.04GB path /dev/sda5
Btrfs v0.20-rc1
[root@oldlaptop ~]# btrfs fi df /
Data: total=1.01GB, used=662.47MB
System, DUP: total=8.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.00GB, used=37.57MB
Metadata: total=8.00MB, used=0.00
Chris Murphy--
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