netdev - Re: [Bugme-new] [Bug 8778] New: Ocotea board: kernel reports access of bad area during boot with DEBUG

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Date:	Wed, 18 Jul 2007 09:55:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Eugene Surovegin <ebs@...home.net>, linux-mm@...ck.org,
	Christoph Lameter <clameter@....com>
Cc:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>, bart.vanassche@...il.com,
	netdev@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, linuxppc-embedded@...abs.org
Subject: Re: [Bugme-new] [Bug 8778] New: Ocotea board: kernel reports access
 of bad area during boot with DEBUG_SLAB=y

On Wed, 18 Jul 2007 08:59:40 -0700 Eugene Surovegin <ebs@...home.net> wrote:

> On Wed, Jul 18, 2007 at 08:41:10AM -0500, Josh Boyer wrote:
> > On Wed, 2007-07-18 at 01:34 -0700, Eugene Surovegin wrote:
> > > On Wed, Jul 18, 2007 at 12:52:53AM -0700, Andrew Morton wrote:
> > > > On Wed, 18 Jul 2007 00:07:50 -0700 (PDT) bugme-daemon@...zilla.kernel.org wrote:
> > > > 
> > > > > http://bugzilla.kernel.org/show_bug.cgi?id=8778
> > > > > 
> > > > >            Summary: Ocotea board: kernel reports access of bad area during
> > > > >                     boot with DEBUG_SLAB=y
> > > 
> > > Slab debugging is probably the culprit here. I had similar problem 
> > > couple of years ago, not sure something has changed since then, 
> > > haven't checked.
> > > 
> > > When slab debugging was enabled it made memory allocations non L1 
> > > cache line aligned. This is very bad for DMA on non-coherent cache 
> > > arches (PPC440 is one of those archs).
> > > 
> > > I have a hack for EMAC which tries to "workaround" this problem:
> > > 	http://kernel.ebshome.net/emac_slab_debug.diff
> > > which might help.
> > 
> > Would you be opposed to including that patch in mainline?
> 
> Yes. I don't think it's the right way to fix this issue. IMO, the 
> right one is to fix slab allocator. You cannot change all drivers to 
> do this kind of cache flushing, and yes, I saw the same problem with 
> PCI based NIC I tried on Ocotea at the time.
> 

hm.  It should be the case that providing SLAB_HWCACHE_ALIGN at
kmem_cache_create() time will override slab-debugging's offsetting
of the returned addresses.

Or is the problem occurring with memory which is returned from kmalloc(),
rather than from kmem_cache_alloc()?

A complete description of the problem would help here, please.
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