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Date:	Sat, 28 Jan 2012 08:14:42 +0000 (UTC)
From:	WIMPy <WIMPy@...i.dk>
To:	linux-ext4@...r.kernel.org
Subject: Re: [dm-devel] can't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd

Update:

>> > > this is a problem which apparently occurred when the user went from
> > > v3.1.5 to v3.2, so this looks likes 3.2 regression.)
> 
> I am on 3.2.0 as well.

I didn't spot anything obvious in the logs.
 
> It happened for me on a freshly created FS.
> "mke2fs -j -O sparse_super -O dir_index -O extents -O filetype -O uninit_bg"
> mounted with no additional options for the first time I got an
> "EXT4-fs error (device md127): ext4_mb_generate_buddy:739: group 28671, 32765 
> clusters in bitmap, 32766 in gd"
> after writing about 3TB of data.
> I do not have RO snapshots as the OP, but my md sits on to of luks 
containers. 
> So we do have the device mapper in common.

After I did an fsck and tried to continue, I didn't get that far.
After another 200GB or so it happened again.
And now it's reproducible:
I can run fsck and then try to continue (using rsync). But as soon as writing 
starts, the process hangs for a long time. At least one minute, probably longer.
Then the ext4_mb_generate_buddy comes again.

I upgraded e2fstools from 1.41.14 to 1.42 and the kernel to 3.2.2.
No difference.
That FS is unusable.

> Just for the records: Unlike the contents, the hardware is not new and did 
not 
> have any known issues.
> 
>   Greetings,
>     WIMPy
> 
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