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On my Ubuntu Server 12.04 I got this errors (via dmesg):

[ 1104.544121] EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10771, 0 clusters in bitmap, 32768 in gd
[ 1104.549227] EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10772, 0 clusters in bitmap, 32768 in gd
[ 1151.872640] EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10784, 28639 clusters in bitmap, 28640 in gd

I have absolutely no idea why these errors are showing up.

My server configuration:

  • 1 x SATA HDD for the OS
  • 4 x 2TB SATA HDD (device md0): RAID 5 on EXT4

Possible sources of the errors:

  • I (or the system automatically) did a resync, because one SATA cable was damaged.
  • I copied some files from an external hdd with NTFS to the EXT4 Raid system (but this shouldn't be a problem I guess).

I googled, but didn't found a solution. I may try:

  • The command fsck (can't provide link, because of superuser.com spam protection..) to repair something? Maybe it helps...
  • Wait for a solution on this Linux Kernel Bug entry
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Okay I think the resync and fsck command fixed the problem. The errors do not show up again. –  Юнгвирт Тони Dec 29 '12 at 10:59
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1 Answer

up vote 0 down vote accepted

You should try umounting the disk and running fsck on it. What does this command show?

cat /proc/mdstat

Your disks should be in sync so you can repair the filesystem.

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Okay I think the resync and fsck command fixed the problem. The errors do not show up again. –  Юнгвирт Тони Apr 26 '13 at 12:23
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