linux-kernel - Re: mm, we use rcu access task_struct in mm_match_cgroup(), but not use rcu free in free_task

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Message-ID: <263518b9-5a39-1af9-ac9e-055da3384aef@suse.cz>
Date:   Wed, 24 May 2017 09:49:18 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Xishi Qiu <qiuxishi@...wei.com>, Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        "wencongyang (A)" <wencongyang2@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        zhong jiang <zhongjiang@...wei.com>
Cc:     Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm, we use rcu access task_struct in mm_match_cgroup(), but not
 use rcu free in free_task_struct()

On 05/24/2017 06:40 AM, Xishi Qiu wrote:
> On 2017/5/24 9:40, Xishi Qiu wrote:
> 
>> Hi, I find we use rcu access task_struct in mm_match_cgroup(), but not use
>> rcu free in free_task_struct(), is it right?
>>
>> Here is the backtrace.

Can you post the whole oops, including kernel version etc? Is it the
same 3.10 RH kernel as in the other report?