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

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894
Date 2015-12-29 17:30 +0100
Message-ID <qL5jP-2Vk-1@gated-at.bofh.it> (permalink)
References <qJhIt-167-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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[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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Thread

BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 Jeremiah Mahler <jmmahler@gmail.com> - 2015-12-24 18:20 +0100
  Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 Michal Hocko <mhocko@kernel.org> - 2015-12-29 17:30 +0100
    Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 Andrew Morton <akpm@linux-foundation.org> - 2015-12-29 19:40 +0100
      Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 Jeremiah Mahler <jmmahler@gmail.com> - 2015-12-29 20:00 +0100
      Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 Stephen Rothwell <sfr@canb.auug.org.au> - 2015-12-30 23:40 +0100

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