linux-kernel - Re: sysfs lockdep complaint

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Message-ID: <1266664814.11514.5.camel@jlt3.sipsolutions.net>
Date:	Sat, 20 Feb 2010 12:20:14 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: sysfs lockdep complaint

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.

johannes

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