linux-kernel - Re: Multiple oom_reaper BUGs: unmap_page_range racing with exit

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Message-ID: <20171207084457.GD20234@dhcp22.suse.cz>
Date:   Thu, 7 Dec 2017 09:44:57 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Multiple oom_reaper BUGs: unmap_page_range racing with exit_mmap

On Thu 07-12-17 09:28:01, Michal Hocko wrote:
[...]
> oom_reaper		oom_victim		task
> 						mmget_not_zero
> 			exit_mmap

bleh, this should have been do_exit

> 			  mmput
> __oom_reap_task_mm				mmput
>   						  __mmput
> 						    exit_mmap
> 						      remove_vma
>   unmap_page_range
-- 
Michal Hocko
SUSE Labs