From: Johannes Berg <johannes@sipsolutions.net>
To: "Américo Wang" <xiyou.wangcong@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down
Date: Sat, 20 Feb 2010 09:45:30 +0100 [thread overview]
Message-ID: <1266655530.3790.0.camel@jlt3.sipsolutions.net> (raw)
In-Reply-To: <2375c9f91002192046u5105db8j4b8a63647d9220ce@mail.gmail.com>
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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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next prev parent reply other threads:[~2010-02-20 8:45 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-29 4:41 [2.6.33-rc5] Weird deadlock when shutting down Benjamin Herrenschmidt
2010-02-18 9:36 ` Johannes Berg
2010-02-18 16:31 ` Linus Torvalds
2010-02-18 18:45 ` Johannes Berg
2010-02-20 7:13 ` Américo Wang
2010-02-20 8:56 ` Johannes Berg
2010-02-20 9:06 ` Américo Wang
2010-02-20 10:53 ` Johannes Berg
2010-02-20 11:28 ` Johannes Berg
2010-02-20 12:07 ` Johannes Berg
2010-02-20 13:44 ` Américo Wang
2010-02-20 13:57 ` Johannes Berg
2010-02-21 9:51 ` Américo Wang
2010-02-21 10:17 ` Johannes Berg
2010-02-22 8:19 ` Américo Wang
2010-02-22 8:39 ` Johannes Berg
2010-02-21 10:43 ` Johannes Berg
2010-02-21 10:55 ` Xiaotian Feng
2010-02-21 11:12 ` Xiaotian Feng
2010-02-21 11:14 ` Johannes Berg
2010-02-21 11:22 ` Johannes Berg
2010-02-22 8:34 ` Américo Wang
2010-02-22 9:04 ` Johannes Berg
2010-02-22 9:12 ` Américo Wang
2010-02-22 9:14 ` Johannes Berg
2010-02-22 9:21 ` Américo Wang
2010-02-22 8:22 ` Américo Wang
2010-02-20 7:42 ` Dave Young
2010-02-20 8:46 ` Johannes Berg
2010-02-20 4:46 ` Américo Wang
2010-02-20 8:45 ` Johannes Berg [this message]
2010-02-20 9:30 ` Américo Wang
2010-02-20 10:52 ` Johannes Berg
2010-03-25 11:28 ` David Howells
2010-03-26 2:43 ` Américo Wang
2010-03-26 12:22 ` David Howells
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