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Date:	Thu, 7 Aug 2014 14:53:54 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	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,

On Thu, Aug 7, 2014 at 2:36 PM, Joonsoo Kim <js1304@...il.com> wrote:
>> With latest mainline, I'm getting a crash during bootup on m68k/ARAnyM:
>>
>> enable_cpucache failed for radix_tree_node, error 12.
>> kernel BUG at /scratch/geert/linux/linux-m68k/mm/slab.c:1522!

>> I bisected it to commit a640616822b2c3a8009b0600f20c4a76ea8a0025
>> Author: Joonsoo Kim <iamjoonsoo.kim@....com>
>> Date:   Wed Aug 6 16:04:38 2014 -0700
>>
>>     slab: remove BAD_ALIEN_MAGIC

> This patch only works for !NUMA. And if num_possible_nodes() is 1,
> then it doesn't have any effect, because alloc_alien_cache() call is always
> skipped. Is it possible !NUMA and num_possible_nodes() != 1?
>
> Could you check your config for CONFIG_NUMA and
> CONFIG_NODES_SHIFT?

$ grep CONFIG_NUMA .config
$ grep CONFIG_NODES_SHIFT .config
CONFIG_NODES_SHIFT=3
$

There are indeed multiple nodes:

On node 0 totalpages: 3584
free_area_init_node: node 0, pgdat 003659a4, node_mem_map 00402000
  DMA zone: 32 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 3584 pages, LIFO batch:0
On node 1 totalpages: 65536
free_area_init_node: node 1, pgdat 00366294, node_mem_map 00426090
  DMA zone: 576 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 65536 pages, LIFO batch:15

> And, could you check booting with boot param "noaliencache"?

That fixes the boot, too.

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
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