ext4dev oddity

Eric Sandeen sandeen at redhat.com
Wed Mar 26 21:07:12 UTC 2008


Trever L. Adams wrote:
> I am having some pretty good success on some different machines with
> ext4.
> 
> However, I am getting this message:
> EXT4-fs error (device dm-0): ext4_mb_generate_buddy: EXT4-fs: group 717:
> 23410 blocks in bitmap, 23411 in gd
> 
> EXT4-fs error (device dm-0): ext4_mb_generate_buddy: EXT4-fs: group 721:
> 19309 blocks in bitmap, 19333 in gd
> 
> What do I need to do to help debug this, if anything, and how do I find
> out which files or directories are affected?

Hm, congratulations on finding the first mballoc bug in fedora :)

It looks like freespace accounting got out of sync somehow... and I
assume this is right after a mount, right?

If the fs is still mounted, can you gather up the files in
/proc/fs/ext4/dm-0 and make them available somewhere?

Any idea what sort of load led to this?  Does it persist across mounts?

If you like, you could bring this to the linux-ext4 list, as well.

Thanks,
-Eric




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