linux-kernel - Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894

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Message-ID: <20151229162346.GB10321@dhcp22.suse.cz>
Date:	Tue, 29 Dec 2015 17:23:47 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Jeremiah Mahler <jmmahler@...il.com>
Cc:	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894

[CCing Andrew]

On Thu 24-12-15 09:12:53, Jeremiah Mahler wrote:
> all,
> 
> I have started seeing a "Bad rss-counter" message in the logs with
> the latest linux-next 20151222+.
> 
>   [  458.282192] BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894

This is MM_SHMEMPAGES so an "unamapped" shmem memory. One possible
reason might be an unitialized zap_details used from unmap_mapping_range
during truncate introduced by "mm, oom: introduce oom reaper" from the
mmotm tree. There is a fix for this which is still pending
http://lkml.kernel.org/r/1450487091-7822-1-git-send-email-sasha.levin%40oracle.com
-- 
Michal Hocko
SUSE Labs
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