linux-kernel - Re: [PATCH -v4] futex: fix reference leak

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Message-ID: <20090211172428.GA23119@elte.hu>
Date:	Wed, 11 Feb 2009 18:24:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Darren Hart <dvhltc@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH -v4] futex: fix reference leak


* Peter Zijlstra <peterz@...radead.org> wrote:

> Subject: futex: fix reference leak
> From: Peter Zijlstra <peterz@...radead.org>
> 
> Catalin noticed that (38d47c1b7075: futex: rely on get_user_pages() for
> shared futexes) caused an mm_struct leak.
> 
> Some tracing with the function graph tracer quickly pointed out that
> futex_wait() has exit paths with unbalanced reference counts.
> 
> This regression was discovered by kmemleak.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Tested-by: "Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
> Tested-by: Catalin Marinas <catalin.marinas@....com>
> Reported-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  kernel/futex.c |   53 ++++++++++++++++++++++++++++-------------------------
>  1 files changed, 28 insertions(+), 25 deletions(-)

Applied to tip:core/urgent, thanks guys!

	Ingo
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