linux-kernel - Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Date:	Thu, 28 Aug 2008 10:02:26 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	David Miller <davem@...emloft.net>
Cc:	bunk@...nel.org, torvalds@...ux-foundation.org,
	rusty@...tcorp.com.au, Alan.Brunelle@...com, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, mingo@...e.hu,
	linux-embedded@...r.kernel.org
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

On Wed, Aug 27, 2008 at 05:46:05PM -0700, David Miller wrote:
> From: Paul Mundt <lethal@...ux-sh.org>
> Date: Thu, 28 Aug 2008 09:32:13 +0900
> 
> > On Wed, Aug 27, 2008 at 08:35:44PM +0300, Adrian Bunk wrote:
> > > CONFIG_DEBUG_STACKOVERFLOW should give you the same information, and if
> > > wanted with an arbitrary limit.
> >
> > In some cases, yes. In the CONFIG_DEBUG_STACKOVERFLOW case the check is
> > only performed from do_IRQ(), which is sporadic at best, especially on
> > tickless. While it catches some things, it's not a complete solution in
> > and of iteslf.
> 
> BTW, on sparc64 we have a stack overflow checker that runs via
> the profiling _mcount hook.  So every function call we check
> if the stack is getting overused.
> 
> If so, we jump onto a special static debugging stack and print
> the stack overflow message.
> 
> And yes it works with IRQ stacks which is all that sparc64 uses
> nowadays.
> 
> Perhaps this is useful enough to make generic.

Thanks for the pointer, I'll take a look at it!
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