linux-kernel - Re: [PATCH, RESEND] locks: fix possible infinite loop in posix deadlock detection

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Message-ID: <20071030153556.3c6cfa29@the-village.bc.nu>
Date:	Tue, 30 Oct 2007 15:35:56 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, stable@...nel.org,
	linux-kernel@...r.kernel.org,
	"George G. Davis" <gdavis@...sta.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH, RESEND] locks: fix possible infinite loop in posix
 deadlock detection

On Tue, 30 Oct 2007 11:20:02 -0400
"J. Bruce Fields" <bfields@...ldses.org> wrote:

> From: J. Bruce Fields <bfields@...i.umich.edu>
> 
> It's currently possible to send posix_locks_deadlock() into an infinite
> loop (under the BKL).
> 
> For now, fix this just by bailing out after a few iterations.  We may
> want to fix this in a way that better clarifies the semantics of
> deadlock detection.  But that will take more time, and this minimal fix
> is probably adequate for any realistic scenario, and is simple enough to
> be appropriate for applying to stable kernels now.
> 
> Thanks to George Davis for reporting the problem.
> 
> Cc: "George G. Davis" <gdavis@...sta.com>
> Signed-off-by: J. Bruce Fields <bfields@...i.umich.edu>

Acked-by: Alan Cox <alan@...hat.com>

Its a good fix for now and I doubt any real world user has that complex a
locking pattern to break.
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