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

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Message-Id: <20120417141315.703056a6.akpm@linux-foundation.org>
Date:	Tue, 17 Apr 2012 14:13:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Yurij.Plotnikov@...etlabs.ru, Alexandra.Kossovsky@...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, 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.

Wanna help out here please?

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