linux-kernel - Re: [PATCH -tip ] [BUGFIX] kprobes: Fix a double lock bug of kprobe

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Message-ID: <20130418181709.GE9897@mtj.dyndns.org>
Date:	Thu, 18 Apr 2013 11:17:09 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH -tip ] [BUGFIX] kprobes: Fix a double lock bug of
 kprobe_mutex

On Thu, Apr 18, 2013 at 06:33:18PM +0900, Masami Hiramatsu wrote:
> Fix a double locking bug caused when debug.kprobe-optimization=0.
> While the proc_kprobes_optimization_handler locks kprobe_mutex,
> wait_for_kprobe_optimizer locks it again and that causes a double lock.
> To fix the bug, this introduces different mutex for protecting
> sysctl parameter and locks it in proc_kprobes_optimization_handler.
> Of course, since we need to lock kprobe_mutex when touching kprobes
> resources, that is done in *optimize_all_kprobes().
> 
> This bug was from ad72b3bea744b4db01c89af0f86f3e8920d354df
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> Cc: "David S. Miller" <davem@...emloft.net>

Oops,

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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