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Message-ID: <56D97E05.2080106@huawei.com>
Date: Fri, 4 Mar 2016 20:22:29 +0800
From: zhong jiang <zhongjiang@huawei.com>
MIME-Version: 1.0
Subject: Re: A oops occur when it calls kmem_cache_alloc
References: <56D9491E.1020905@huawei.com> <56D96734.6050108@I-love.SAKURA.ne.jp>
In-Reply-To: <56D96734.6050108@I-love.SAKURA.ne.jp>
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To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, LKML <linux-kernel@vger.kernel.org>, Xishi Qiu <qiuxishi@huawei.com>, Linux
 Memory Management List <linux-mm@kvack.org>

On 2016/3/4 18:45, Tetsuo Handa wrote:
> On 2016/03/04 17:36, zhong jiang wrote:
>> The vmcore file show the collapse reason that the page had been removed
>> when we acqure the page and  prepare to remove the page from the slub
>>  partial list.
>>
>> The list is protected by the spin_lock from concurrent operation. And I find
>> that other core is wating the lock to alloc memory.  Therefore , The concurrent
>> access should be impossible.
>>
>> what situatios can happen ?  or it is a kernel bug potentially.  This question
>> almost impossible to produce again. The following is the call statck belonging to
>> the module.
> No kernel version, no clue.
>
>
>
   Sorry,  The kernel version is 3.4 stable version.  And The mainline , by comparison,  have no relative
   modification.

Thanks
zhongjiang

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