linux-kernel - Re: Random panic in load

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Message-ID: <CA+55aFwQfwfAP6U77_nD_mSvoygj=cZ09N644hKRtzgLnEqhZQ@mail.gmail.com>
Date:	Wed, 23 Jul 2014 11:55:42 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.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 11:41 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?

                  Linus
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