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Date:	Sat, 28 Jan 2012 04:53:26 +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

Mikulas Patocka <mpatocka <at> redhat.com> writes:

> The existence of a snapshot changes I/O completion times significantly, so 
> it may be a race condition in ext4 that gets triggered which changed 
> timings.

The idea that timing might cause issues on a FS is disturbing.

> > 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.

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.

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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