linux-kernel - Re: [PATCH] mm/slub: Switch slub_debug kernel option to early

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Date:	Thu, 7 Nov 2013 09:41:29 +0100
From:	Andreas Herrmann <andreas.herrmann@...xeda.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: Switch slub_debug kernel option to early_param
 to avoid boot panic

On Thu, Nov 07, 2013 at 09:27:32AM +0100, Andreas Herrmann wrote:
> On Wed, Nov 06, 2013 at 04:38:10PM -0500, Christoph Lameter wrote:
> > On Wed, 6 Nov 2013, Andreas Herrmann wrote:
> > 
> > > Would be nice, if your patch is pushed upstream asap.
> > 
> > Ok so this is a
> > 
> > Tested-by: Andreas Herrmann <andreas.herrmann@...xeda.com>
> > 
> > I think?
> 
> Yes.

And for sake of completeness. Here is some debug output with a kernel
that had your "slub: Handle NULL parameter in kmem_cache_flags" patch
applied. And of course there were a couple of unnamed slabs:

  ...
         .bss : 0xc089fd80 - 0xc094cc4c   ( 692 kB)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (c06fc90c): kmem_cache_node
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (c06fc91c): kmem_cache
→ slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  slub_debug_slabs (c2956a08): skbuff_fclone_cache, name (  (null)): (null)
  SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
  ...

The third one is wheree the panic happened w/o the fix.


Andreas
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