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Message-ID: <20120604230404.GB6525@thunk.org>
Date: Mon, 4 Jun 2012 19:04:04 -0400
From: Ted Ts'o <tytso@....edu>
To: Sander Eikelenboom <linux@...elenboom.it>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
dm-devel@...hat.com, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: EXT4-fs error (device dm-42): ext4_mb_generate_buddy:741:
group 1904, 32254 clusters in bitmap, 32258 in gd
On Mon, Jun 04, 2012 at 07:20:48PM +0200, Sander Eikelenboom wrote:
> Hello Ted,
>
> I have a problem back that occured , but didn't receive much respons in debugging:
>
> [ 4688.270789] EXT4-fs error (device dm-42): ext4_mb_generate_buddy:741: group 1904, 32254 clusters in bitmap, 32258 in gd
> [ 4688.279172] Aborting journal on device dm-42-8.
> [ 4688.288634] EXT4-fs (dm-42): Remounting filesystem read-only
> [ 4688.299011] EXT4-fs (dm-42): ext4_da_writepages: jbd2_start: 6144 pages, ino 15597569; err -30
Ah, sorry, I didn't see this message when I responded to your earlier
message (you didn't mail thread it). I also didn't recall your
earlier complaint until I did an search of my mail archives.
The main problem is that we don't have an easy reproduction case.
It's not a problem which has been showing up on any of my testing.
Earlier you had said that this happened after a read-only snapshot, so
I had assumed it was an DM issue.
But you say this time it's not happening without a snapshot. OK, how
frequently does this happen? How easily can you reproduce it? Can
you do it pretty much on demand? And are the numbers *always* the same?
>
> Running: Fsck -D -f -v -p, results in:
>
Can you run this command instead? e2fsck -f /dev/XXXX
And send me the output? The -p overrides the -f option, so it wasn't
doing a full fsck check. It should have done a full check if the file
system was marked as containing an error, regardless of the -p, but
there was a bug that was fixed in 3.5-rc1 which prevented that. I'm
at a loss to explain why you were still seeing problem in 3.5-rc1 ---
was the fsck log from after running a kernel running 3.5-rc1? In any
case, please do a full fsck using "e2fsck -f /dev/XXX" and send me the
output from that command.
Regards,
- Ted
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