Re: ext4_da_release_space:1333: ext4_da_release_space: ino 12,to_free 1 with only 0 reserved data blocks

From: Dave Jones
Date: Wed Jul 31 2013 - 12:39:33 EST

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..
> > 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.


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