linux-kernel - Re: [PATCH] softlockup: fix potential race in hung

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Date:	Sun, 18 Jan 2009 19:22:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mandeep Singh Baines <msb@...gle.com>
Cc:	linux-kernel@...r.kernel.org, hannes@...xchg.org,
	rientjes@...gle.com, mbligh@...gle.com, thockin@...gle.com
Subject: Re: [PATCH] softlockup: fix potential race in hung_task when
	resetting timeout


* Mandeep Singh Baines <msb@...gle.com> wrote:

> Patch against tip/core/softlockup.
> 
> ---
> 
> A potential race exists if sysctl_hung_task_timeout_secs is reset to 0
> while inside check_hung_uniterruptible_tasks(). If check_task() is
> entered, a comparison with 0 will result in a false hung_task being
> detected.
> 
> If sysctl_hung_task_panic is set, the system will panic.
> 
> Signed-off-by: Mandeep Singh Baines <msb@...gle.com>
> ---
>  kernel/hung_task.c |   24 ++++++++++++++++--------
>  1 files changed, 16 insertions(+), 8 deletions(-)

Applied to tip/core/softlockup, thanks Mandeep!

	Ingo
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