linux-kernel - Re: tasklist_lock lockdep warnings on 3.6

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Message-ID: <501A8BD0.1000603@gmail.com>
Date:	Thu, 02 Aug 2012 16:16:48 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>, tglx@...utronix.de,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: tasklist_lock lockdep warnings on 3.6

On 08/02/2012 03:26 PM, Dave Jones wrote:
> On Mon, Jul 30, 2012 at 04:50:46PM +0200, Sasha Levin wrote:
>  > ping?
>  > 
>  > I'm still seeing this on linux-next.
> 
> Likewise, except I'm seeing it in Linus' tree since shortly after this merge window
> began. (https://lkml.org/lkml/2012/7/24/443).
> 
> I've spent all of this last week doing multiple attempts at bisecting this without success.
> (It doesn't always show up, and even after running the test for over an hour before
> marking a build 'good')
> 
> Anyone ?
> 
> 	Dave

I've been able to hit this issue pretty much every time by hitting sysrq-t after about 10 seconds of fuzzing. It shows up in the middle of the sysrq-t spew.

Unfortunately I didn't have time yet to try and bisect it.
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