linux-ext4 - Re: EXT4 ENOSPC Bug

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Date:	Mon, 16 Feb 2009 10:01:56 -0500
From:	Theodore Tso <tytso@....edu>
To:	Andres Freund <andres@...razel.de>
Cc:	adilger@....com, LKML <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	Jonathan Bastien-Filiatrault <joe@....org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: EXT4 ENOSPC Bug

On Mon, Feb 16, 2009 at 12:37:19PM +0100, Andres Freund wrote:
> Hi All,
>
> "Luckily", to prove that I am not completly mad I recently found this  
> problem again. On a more recent kernel:
> 2.6.29-rc3-andres-00498-g68e80d5
> (upstream 2.6.29 + Theodore's ext4 debug patches)
>
> Again I got:
> open("/home/andres/tt", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK, 0666) = -1  
> ENOSPC (No space left on device)

So /home/andres/tt does not exist, correct?  Does this happen for any
attempt to create a new zero-length file using the "touch" command?
(Even in other directories)   Can you append to a file using "cat
/etc/mailcap >> some_existing_file"?

If it is "yes" to the first two questions, and "no" the third, it
looks like this might be an inode allocation failure as opposed to a
block allocation failure.

Once this triggers, does it reliably continue to fail if you reboot?
Or does it go away when you reboot?

					- Ted
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