linux-kernel - Re: Random panic in load

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Message-ID: <20140723190230.GH3935@laptop>
Date:	Wed, 23 Jul 2014 21:02:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dietmar Eggemann <dietmar.eggemann@....com>,
	Michel Dänzer <michel@...nzer.net>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Random panic in load_balance() with 3.16-rc

On Wed, Jul 23, 2014 at 11:55:42AM -0700, Linus Torvalds wrote:
> On Wed, Jul 23, 2014 at 11:41 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > OK, that leaves us agreeing we want to clean that up, but still no
> > closer to explaining WTH happened on Michel's machine. Weird that.
> 
> So looking at that destination pointer value (ffff10043c803e8c), it
> *looks* like a pointer. Almost. If it was 0xffff80.. instead of
> 0xffff10.. it would probably be a fine pointer.
> 
> Can you send me the config? I'm wondering what else might be close to
> that load_balance_mask percpu allocation, that migth perhaps have
> overflowed and written a stray byte into the pointer or something?

Here goes..

View attachment "michel-config.txt" of type "text/plain" (133061 bytes)