linux-kernel - Re: Kernel panic - not syncing: Attempted to kill the idle task!

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Message-ID: <1339496836.31548.68.camel@twins>
Date:	Tue, 12 Jun 2012 12:27:16 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	hi3766691@...il.com, Hillf Danton <dhillf@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Zhouping Liu <zliu@...hat.com>
Subject: Re: Kernel panic - not syncing: Attempted to kill the idle task!

On Tue, 2012-06-12 at 13:20 +0300, Linus Torvalds wrote:
> Peter, you are very fundamentally wrong if you think the distance
> array has to be symmetric. That is fundamentally not true for many
> typologies.
> 
> The trivial example of a non symmetric case is just a simple
> unidirectional ring. The distance from n to n+1 is just one, but the
> distance from n+1 to n is n-1 hops.
> 
> So don't try to say that distances have to be symmetric. That's just
> garbage. 

Sure, I realize this, but the 17,18 thing isn't a ring. It looks like
something that should be symmetric but isn't.


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