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Date:	Thu, 7 Aug 2014 13:52:04 +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: BUG: enable_cpucache failed for radix_tree_node, error 12 (was: Re:
 [PATCH v3 9/9] slab: remove BAD_ALIEN_MAGIC)

Hi Joonsoo,

On Tue, Jul 1, 2014 at 10:27 AM, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> BAD_ALIEN_MAGIC value isn't used anymore. So remove it.
>
> Acked-by: Christoph Lameter <cl@...ux.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  mm/slab.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/mm/slab.c b/mm/slab.c
> index 7820a45..60c9e11 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -470,8 +470,6 @@ static struct kmem_cache kmem_cache_boot = {
>         .name = "kmem_cache",
>  };
>
> -#define BAD_ALIEN_MAGIC 0x01020304ul
> -
>  static DEFINE_PER_CPU(struct delayed_work, slab_reap_work);
>
>  static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
> @@ -838,7 +836,7 @@ static int transfer_objects(struct array_cache *to,
>  static inline struct alien_cache **alloc_alien_cache(int node,
>                                                 int limit, gfp_t gfp)
>  {
> -       return (struct alien_cache **)BAD_ALIEN_MAGIC;
> +       return NULL;
>  }

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!
*** TRAP #7 ***   FORMAT=0
Current process id is 0
BAD KERNEL TRAP: 00000000
Modules linked in:
PC: [<0039c92c>] kmem_cache_init_late+0x70/0x8c
SR: 2200  SP: 00345f90  a2: 0034c2e8
d0: 0000003d    d1: 00000000    d2: 00000000    d3: 003ac942
d4: 00000000    d5: 00000000    a0: 0034f686    a1: 0034f682
Process swapper (pid: 0, task=0034c2e8)
Frame format=0
Stack from 00345fc4:
        002f69ef 002ff7e5 000005f2 000360fa 0017d806 003921d4 00000000 00000000
        00000000 00000000 00000000 00000000 003ac942 00000000 003912d6
Call Trace: [<000360fa>] parse_args+0x0/0x2ca
 [<0017d806>] strlen+0x0/0x1a
 [<003921d4>] start_kernel+0x23c/0x428
 [<003912d6>] _sinittext+0x2d6/0x95e

Code: f7e5 4879 002f 69ef 61ff ffca 462a 4e47 <4879> 0035 4b1c 61ff
fff0 0cc4 7005 23c0 0037 fd20 588f 265f 285f 4e75 48e7 301c
Disabling lock debugging due to kernel taint
Kernel panic - not syncing: Attempted to kill the idle task!
---[ end Kernel panic - not syncing: Attempted to kill the idle task!

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

    BAD_ALIEN_MAGIC value isn't used anymore. So remove it.

    Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
    Acked-by: Christoph Lameter <cl@...ux.com>
    Cc: Pekka Enberg <penberg@...nel.org>
    Cc: David Rientjes <rientjes@...gle.com>
    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

Error 12 is ENOMEM, so I first thought it went out-of-memory, but just reverting
the above commit on mainline makes it work again.

I don't see the failure on ARM.

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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