linux-kernel - Re: BUG: enable_cpucache failed for radix_tree_node, error 12 (was: Re: [PATCH v3 9/9] slab: remove BAD_ALIEN

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Date:	Fri, 8 Aug 2014 10:56:12 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: BUG: enable_cpucache failed for radix_tree_node, error 12 (was:
 Re: [PATCH v3 9/9] slab: remove BAD_ALIEN_MAGIC)

Hi Joonsoo,

On Fri, Aug 8, 2014 at 9:19 AM, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> Could you show me your full dmesg on boot-up?
> What I want to know is nodes-cpus mapping.

Attached.

If you want more debug output, please ask.

> I looked at SLAB code and found that SLAB works fine only if
> numa_mem_id() always returns 0. I guess that this is the case for
> !CONFIG_NUMA, so your system would work fine.
>
> And, I looked at SLUB code and found that SLUB works fine only if
> page_to_nid(page) always return 0 for this !CONFIG_NUMA and many nodes
> case. If not, some memory could be leak, I guess.

I've just tried SLUB, it boots fine. That doesn't say there are no leaks,
though.

> Of possible, could you check whether page_to_nid(page) returns
> only 0 or not?

It returns 0 or 1.

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Download attachment "dmesg" of type "application/octet-stream" (5535 bytes)