Ubuntu
btrfs-tools package

  1. Bug #1654057
  2. Comment #3

Comment 3 for bug 1654057

Revision history for this message
MichaelE (michael-eitelwein) wrote :

Btrfs ran into this issue a couple of times on this partition, always falling back to read-only.

A btrfs check produced the following log entries:

Jan 5 18:44:01 mothership kernel: [1451559.293128] BTRFS warning (device dm-19): checksum error at logical 105529344 on dev /dev/mapper/VGinternal02-root--backup, sector 206112: metadata leaf (level 0) in tree 7
Jan 5 18:44:01 mothership kernel: [1451559.293134] BTRFS warning (device dm-19): checksum error at logical 105529344 on dev /dev/mapper/VGinternal02-root--backup, sector 206112: metadata leaf (level 0) in tree 7
Jan 5 18:44:01 mothership kernel: [1451559.293140] BTRFS error (device dm-19): bdev /dev/mapper/VGinternal02-root--backup errs: wr 0, rd 0, flush 0, corrupt 1, gen 0
Jan 5 18:44:01 mothership kernel: [1451559.293144] BTRFS error (device dm-19): unable to fixup (regular) error at logical 105529344 on dev /dev/mapper/VGinternal02-root--backup
Jan 5 18:44:02 mothership kernel: [1451559.601334] BTRFS warning (device dm-19): checksum error at logical 105545728 on dev /dev/mapper/VGinternal02-root--backup, sector 206144: metadata leaf (level 0) in tree 7
Jan 5 18:44:02 mothership kernel: [1451559.601336] BTRFS warning (device dm-19): checksum error at logical 105545728 on dev /dev/mapper/VGinternal02-root--backup, sector 206144: metadata leaf (level 0) in tree 7
Jan 5 18:44:02 mothership kernel: [1451559.601338] BTRFS error (device dm-19): bdev /dev/mapper/VGinternal02-root--backup errs: wr 0, rd 0, flush 0, corrupt 2, gen 0
Jan 5 18:44:02 mothership kernel: [1451559.601352] BTRFS error (device dm-19): unable to fixup (regular) error at logical 105545728 on dev /dev/mapper/VGinternal02-root--backup

As the content on the disk did not change since I converted from ext4 to btrfs, I think that the inconsistency must have been produced by btrfs. To be sure, I am now also checking the underlying partition for errors - it is a raid 1 with 3 active disks and lvm on top of it. So far neither dm nor lvm reported errors.

Then I will backup to tape and buld a new btrfs partition from scratch.