linux-kernel - Re: sysfs lockdep complaint

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Message-ID: <20100220135122.GB3000@hack>
Date:	Sat, 20 Feb 2010 21:51:22 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: sysfs lockdep complaint

On Sat, Feb 20, 2010 at 12:20:14PM +0100, Johannes Berg wrote:
>On Sat, 2010-02-20 at 17:26 +0800, Américo Wang wrote:
>> On Thu, Feb 18, 2010 at 5:32 PM, Johannes Berg
>> <johannes@...solutions.net> wrote:
>> > Get this when powernowd starts on my G5:
>> >
>> > [   30.490674] =============================================
>> > [   30.490708] [ INFO: possible recursive locking detected ]
>> > [   30.490727] 2.6.33-rc8-wl-64012-g6917413 #160
>> > [   30.490744] ---------------------------------------------
>> > [   30.490763] powernowd/2577 is trying to acquire lock:
>> > [   30.490782]  (s_active){++++.+}, at: [<c0000000001efa94>]
>> .sysfs_addrm_finish+0x58/0xc0
>> > [   30.490831]
>> > [   30.490833] but task is already holding lock:
>> > [   30.490854]  (s_active){++++.+}, at: [<c0000000001eff80>]
>> .sysfs_get_active_two+0x3c/0x84
>> > [   30.490895]
>> 
>> This should be fixed by the patchset from Eric:
>> 
>> http://lkml.org/lkml/2010/2/11/334
>
>Oh wow, well ..... I get like a thousand of these now:
>
>BUG: key c0000002165eb478 not in .data!
>
>instead of the lockdep complaint above.
>

I am not surprised. :)

Please send us the backtraces you got, we could expect this.

Thank you.
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