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

[Michal Hocko]

[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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