From: Mikulas Patocka <mpatocka@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>,
linux-ext4@vger.kernel.org, linux-kernel@vger.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
Date: Fri, 6 Jan 2012 11:40:17 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.64.1201061133140.6954@hs20-bc2-1.build.redhat.com> (raw)
In-Reply-To: <20120105181535.GB26382@thunk.org>
On Thu, 5 Jan 2012, Ted Ts'o wrote:
> On Thu, Jan 05, 2012 at 05:14:28PM +0100, Sander Eikelenboom wrote:
> >
> > OK spoke too soon, i have been able to trigger it again:
> > - copying files from LV to the same LV without the snapshot went OK
> > - copying from the RO snapshot of a LV to the same LV gave the error while copying the file again:
>
> OK. Originally, you said you did this:
>
> 1) fsck -v -p -f the filesystem
> 2) mount the filesystem
> 3) Try to copy a file
> 4) filesystem will be mounted RO on error (see below)
> 5) fsck again, journal will be recovered, no other errors
> 6) start at 1)
>
> Was this with with a read-only snapshot always being in existence
> through all of these five steps? When was the RO snapshot created?
>
> If a RO snapshot has to be there in order for this to happen, then
> this is almost certainly a device-mapper regression. (dm-devel folks,
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.
Mikulas
> 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.)
>
> - Ted
next prev parent reply other threads:[~2012-01-06 16:40 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-05 10:37 can't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd Sander Eikelenboom
2012-01-05 13:21 ` Sander Eikelenboom
2012-01-05 14:45 ` Theodore Tso
2012-01-05 14:45 ` Theodore Tso
2012-01-05 14:52 ` Sander Eikelenboom
2012-01-05 14:52 ` Sander Eikelenboom
2012-01-05 15:46 ` Sander Eikelenboom
2012-01-05 15:46 ` Sander Eikelenboom
[not found] ` <4910694144.20120105171428@eikelenboom.it>
2012-01-05 18:15 ` Ted Ts'o
2012-01-05 20:04 ` Sander Eikelenboom
2012-01-05 20:04 ` Sander Eikelenboom
2012-01-05 20:45 ` Sander Eikelenboom
2012-01-05 20:45 ` Sander Eikelenboom
2012-01-05 21:31 ` Sander Eikelenboom
2012-01-05 21:31 ` Sander Eikelenboom
2012-01-05 22:43 ` Sander Eikelenboom
2012-01-05 22:43 ` Sander Eikelenboom
2012-01-06 16:40 ` Mikulas Patocka [this message]
2012-01-28 4:53 ` [dm-devel] " WIMPy
2012-01-28 8:14 ` WIMPy
2012-01-28 8:34 ` Andreas Dilger
2012-01-28 15:31 ` WIMPy
2012-01-28 21:04 ` WIMPy
2012-02-03 5:30 ` WIMPy
2012-04-12 6:45 ` Landry Minoza
2012-04-12 6:45 ` Landry Minoza
2012-03-19 23:06 [dm-devel] " Tony Hoyle
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