linux-kernel - Re: [2.6.33-rc5] Weird deadlock when shutting down

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Message-ID: <1266655530.3790.0.camel@jlt3.sipsolutions.net>
Date:	Sat, 20 Feb 2010 09:45:30 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down

On Sat, 2010-02-20 at 12:46 +0800, Américo Wang wrote:

> This is a real deadlock case found by lockdep added to s_active.
> 
> The problem is that we did kobject_put(&data->kobj) while holding
> policy_rwsem
> which is used to protect 'data'. It is not so easy to fix this,
> probably we need to do more work on cpufreq code.

But it doesn't make sense that it's just an existing real deadlock that
is now found -- it never occurred previously!

Anyway, I'll try your patch, thanks for that.

johannes

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