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: <20170524082949.GB14733@dhcp22.suse.cz>
Date:   Wed, 24 May 2017 10:29:49 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Xishi Qiu <qiuxishi@...wei.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        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>,
        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 Wed 24-05-17 16:04:20, Xishi Qiu wrote:
> On 2017/5/24 15:49, Vlastimil Babka wrote:
> 
> > 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?
> > 
> 
> Hi Vlastimil,
> 
> Yes, it's RHEL 7.2

Please contact Redhat for the support of this kernel. Feel free to
report the issue if it persists with the current vanilla kernel. It is
really hard for us to help you with a custom patched and an old kernel.
-- 
Michal Hocko
SUSE Labs