linux-kernel - Re: Random panic in load

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Message-ID: <20140723182548.GE3935@laptop>
Date:	Wed, 23 Jul 2014 20:25:48 +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 10:15:23AM -0700, Linus Torvalds wrote:
> On Wed, Jul 23, 2014 at 10:04 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Wed, Jul 23, 2014 at 09:54:23AM -0700, Linus Torvalds wrote:
> >
> >> So the length is fine, and the disassembly shows that it is fixed (16
> >> 32-bit words - why the heck does it use "movsl" rather than "movsq",
> >> whatever).
> >
> > Which is exactly right btw, he's got CONFIG_NR_CPUS=512 and 8*4*16=512.
> 
> That's not my point. Why the f*ck does it use "movsl", when "movsq"
> should work as well or better.

Agreed, big question there. I was merely pointing out that the value is
consistent with his .config.
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