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SubjectRe: ext4_da_release_space:1333: ext4_da_release_space: ino 12, to_free 1 with only 0 reserved data blocks
On Wed 31-07-13 12:39:01, Dave Jones wrote:
> On Wed, Jul 17, 2013 at 11:38:50PM +0200, Jan Kara wrote:
> > On Wed 17-07-13 10:52:18, Dave Jones wrote:
> > > On Wed, Jul 17, 2013 at 02:53:22PM +0200, Jan Kara wrote:
> > > > On Tue 16-07-13 16:25:33, Dave Jones wrote:
> > > > > I've seen this happen a few times this week..
> > > > Thanks for report! Was this when fuzzing or just normal desktop load?
> > > > What is inode with inode number 12 on your filesystem sdb1? What IO happens
> > > > to it? Apparently some delalloc accounting went wrong somewhere and it's
> > > > searching for a needle in a haystack unless we have more details...
> > >
> > > It was running this.. https://github.com/kernelslacker/io-tests/blob/master/setup.sh
> > > in a loop. After about 6 hours, that fell out. It made it all the way through
> > > every test a few times, which is odd, as the test should be fairly deterministic.
> > > Ah, I wasn't capturing the fsx seed. I'll do that on the next run.
> > So inode 12 was likely the file used by fsx. OK. Looking at the script
> > link, fsx is run as:
> > /usr/local/bin/fsx -N 250000 -S0 foo &
> > so the seed is always 0. So it is a deterministic test and there must be
> > some race with writeback or something that is rarely triggered. Drat.
> >
> > Umm, looking at the filesystems this tests, ext4 with 1 KB blocksize is
> > likely the config which hits this (the accounting is more complex there) so
> > it might be interesting to concentrace on this one.
>
> I just retried these tests, and hit this again.
> I can confirm it happens on the 1k block filesystem.
Great, thanks for confirmation. I've just managed to reproduce the
problem yesterday so I'm debugging it...

Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR


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