linux-kernel - Re: [linux-next-20130422] Bug in SLAB?

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Date:	Tue, 30 Apr 2013 00:28:13 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	cl@...ux.com, glommer@...allels.com
Cc:	penberg@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-next-20130422] Bug in SLAB?

Glauber Costa wrote:
> If I am right, the following (untested) patch should solve the problem.

This patch did not help;

  kmalloc(8 * 1024 * 1024, GFP_KERNEL)

still causes both

  include/linux/slab_def.h:136: warning: array subscript is above array bounds

and

  BUG: unable to handle kernel NULL pointer dereference at 00000058
  IP: [<c10b9d76>] kmem_cache_alloc+0x26/0xb0

.

Christoph Lameter wrote:
> What is MAX_ORDER on the architecture?

In my environment (x86_32), the constants are

  MAX_ORDER=11 PAGE_SHIFT=12 KMALLOC_SHIFT_HIGH=22 KMALLOC_MAX_SIZE=4194304
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