linux-kernel - Re: 2.6.19-rc6 : Spontaneous reboots, stack overflows - seems to implicate xfs, scsi, networking, SMP

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Date:	Fri, 24 Nov 2006 08:52:38 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	David Chinner <dgc@....com>
Cc:	Ingo Oeser <netdev@...eo.de>, David Miller <davem@...emloft.net>,
	jesper.juhl@...il.com, chatz@...bourne.sgi.com,
	linux-kernel@...r.kernel.org, xfs@....sgi.com,
	xfs-masters@....sgi.com, netdev@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: 2.6.19-rc6 : Spontaneous reboots, stack overflows - seems to
	implicate xfs, scsi, networking, SMP

On Fri, 2006-11-24 at 11:55 +1100, David Chinner wrote:
> On Thu, Nov 23, 2006 at 07:37:00PM +0100, Arjan van de Ven wrote:
> > On Thu, 2006-11-23 at 14:16 +0100, Ingo Oeser wrote:
> > > Hi there,
> > > 
> > > David Chinner schrieb:
> > > > If the softirqs were run on a different stack, then a lot of these
> > 
> > softirqs DO run on their own stack!
> 
> So they run on a separate stack for 4k stacks on x86?
> 
> They don't run on a separate stack for 8k stacks on x86 -
> Jesper's traces show that - so this may indicate an issue
> with the methodology used to generate the stack overflow
> traces inteh first place. i.e. if 4k stacks use a separate
> stack, then most of the reported overflows are spurious
> and would not normally occur on 4k stack systems..
> 
> Can you confirm this, Arjan?

yes there are separate stacks for softirq and hardirq context with 4K
stacks, but not for 8K stacks.


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
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