linux-kernel - Re: [PATCH] epoll: clear the tfile_check

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Date:	Wed, 18 Apr 2012 08:56:15 +0400
From:	"Alexandra N. Kossovsky" <Alexandra.Kossovsky@...etlabs.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jason Baron <jbaron@...hat.com>, Yurij.Plotnikov@...etlabs.ru,
	davidel@...ilserver.org, nelhage@...hage.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] epoll: clear the tfile_check_list on -ELOOP

On Tue, Apr 17, 2012 at 02:13:15PM -0700, Andrew Morton wrote:
> On Tue, 17 Apr 2012 10:34:52 -0400
> Jason Baron <jbaron@...hat.com> wrote:
> 
> > An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
> > circular epoll dependencies from being created. However, in that case
> > we do not properly clear the 'tfile_check_list'. Thus, add a call to
> > clear_tfile_check_list() for the -ELOOP case.
> 
> So here I am wondering what effect this bug has upon our users, so I
> can decide which kernel versions should be fixed.  Jason didn't tell me
> so I went to read the description of clear_tfile_check_list().  After a
> brief chuckle, I stopped.
> 
> I then found Yurij's original report, so I know what's going on.  But I
> still can't write your changelog because I don't know whether this is a
> regression and if it is, which patch caused the regression.

It is a regression, somewhere between 3.2.6 and 3.2.9.
Yurij and me blame
commit 203aa5260edca2ab1872ad8b08386d874f7132f3
Author: Jason Baron <jbaron@...hat.com>
Date:   Thu Jan 12 17:17:43 2012 -0800
but we have not tested it.

-- 
Alexandra N. Kossovsky
OKTET Labs (http://www.oktetlabs.ru/)
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