linux-kernel - Re: mmotm 2010-11-09 - lockdep splat in ext4/quota code

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Date:	Thu, 25 Nov 2010 00:35:50 -0500
From:	Valdis.Kletnieks@...edu
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: mmotm 2010-11-09 - lockdep splat in ext4/quota code

On Sat, 13 Nov 2010 00:33:43 +0100, Jan Kara said:

> > Still seeing this just after quotas get turned on ext4. First seen in
> > 2.6.36-mmotm1022, but problem has apparently been there since
> > 2.6.36-rc5-mmotm0922 (oldest kernel I have lying around).
>   Thanks for the report. In fact, it is a false positive caused by the fact
> that EXT4(inode)->i_data_sem for quota file inode would need a special
> locking class (or subclass) but does not have one. I'll have a look into
> implementing that sometime next week hopefully.

> > [   48.967833] =======================================================
> > [   48.968162] [ INFO: possible circular locking dependency detected ]
> > [   48.968411] 2.6.37-rc1-mmotm1109 #1

I haven't spotted the commit that fixed it, but I'm assuming it's in there
now, as I am not seeing it on 2.6.37-rc3-mmotm1123, thanks.

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