linux-kernel - Re: kernel BUG at mm/slqb.c:1411!

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Message-Id: <20090513173758.2f3d2a50.minchan.kim@barrios-desktop>
Date:	Wed, 13 May 2009 17:37:58 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: kernel BUG at mm/slqb.c:1411!

On Wed, 13 May 2009 16:42:37 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

Hmm. I don't know slqb well.
So, It's just my guess. 

We surely increase l->nr_partial in  __slab_alloc_page.
In between l->nr_partial++ and call __cache_list_get_page, Who is decrease l->nr_partial again.
After all, __cache_list_get_page return NULL and hit the VM_BUG_ON.

Comment said :

        /* Protects nr_partial, nr_slabs, and partial */
  spinlock_t    page_lock;

As comment is right, We have to hold the l->page_lock ?



-- 
Kinds Regards
Minchan Kim
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