linux-kernel - Re: [2.6.33-rc5] tty: possible irq lock inversion dependency in tty

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Date:	Sun, 7 Feb 2010 14:46:56 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>, gregkh@...e.de,
	taviso@...gle.com, viro@...IV.linux.org.uk,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	alan@...rguk.ukuu.org.uk, jdike@...toit.com, jln@...gle.com,
	mpm@...enic.com
Subject: Re: [2.6.33-rc5] tty: possible irq lock inversion dependency in
	tty_fasync

On Sat, Feb 06, 2010 at 10:31:30PM -0800, Linus Torvalds wrote:
>
>
>On Sun, 7 Feb 2010, Tetsuo Handa wrote:
>> 
>> Below problem (which was introduced between 2.6.33-rc4 and 2.6.33-rc5) is
>> not yet fixed as of 2.6.33-rc7.
>> "git bisect start v2.6.33-rc5 v2.6.33-rc4" reported that
>> 703625118069f9f8960d356676662d3db5a9d116 tty: fix race in tty_fasync
>> is first bad commit.
>
>Yeah. I think we need to just revert that commit.
>
>Or maybe we could just do the following, rather than revert it outright: 
>just get a ref to the 'struct pid' while holding the spinlock, and then 
>releasing it after doing the __f_setown() call.

We already fixed this, a better fix:

http://lkml.org/lkml/2010/1/26/338

I sent a same fix with Greg's.

Thanks.
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