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

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  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

#1298012 — BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894

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

I can test patches if anyone has any ideas.

-- 
- Jeremiah Mahler
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#1299045

[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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#1299077

On Tue, 29 Dec 2015 17:23:47 +0100 Michal Hocko <mhocko@kernel.org> wrote:

> [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

That won't be getting fixed until linux-next returns from holidays.

This:

--- a/mm/memory.c~mm-oom-introduce-oom-reaper-fix-5-fix
+++ a/mm/memory.c
@@ -2415,7 +2415,7 @@ static inline void unmap_mapping_range_t
 void unmap_mapping_range(struct address_space *mapping,
 		loff_t const holebegin, loff_t const holelen, int even_cows)
 {
-	struct zap_details details;
+	struct zap_details details = { };
 	pgoff_t hba = holebegin >> PAGE_SHIFT;
 	pgoff_t hlen = (holelen + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
_

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#1299085

Andrew, Michal,

On Tue, Dec 29, 2015 at 10:30:37AM -0800, Andrew Morton wrote:
> On Tue, 29 Dec 2015 17:23:47 +0100 Michal Hocko <mhocko@kernel.org> wrote:
> 
> > [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
> 
> That won't be getting fixed until linux-next returns from holidays.
> 
> This:
> 
> --- a/mm/memory.c~mm-oom-introduce-oom-reaper-fix-5-fix
> +++ a/mm/memory.c
> @@ -2415,7 +2415,7 @@ static inline void unmap_mapping_range_t
>  void unmap_mapping_range(struct address_space *mapping,
>  		loff_t const holebegin, loff_t const holelen, int even_cows)
>  {
> -	struct zap_details details;
> +	struct zap_details details = { };
>  	pgoff_t hba = holebegin >> PAGE_SHIFT;
>  	pgoff_t hlen = (holelen + PAGE_SIZE - 1) >> PAGE_SHIFT;
>  
> _
> 

I tested both the patch that Michal mentioned as well as the change that
Andrew provided.  The both appear to fix the problem on my machine.

Thanks for the help :-)

-- 
- Jeremiah Mahler
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#1299525

Hi Andrew,

On Tue, 29 Dec 2015 10:30:37 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Tue, 29 Dec 2015 17:23:47 +0100 Michal Hocko <mhocko@kernel.org> wrote:
> 
> > [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  
> 
> That won't be getting fixed until linux-next returns from holidays.
> 
> This:
> 
> --- a/mm/memory.c~mm-oom-introduce-oom-reaper-fix-5-fix
> +++ a/mm/memory.c
> @@ -2415,7 +2415,7 @@ static inline void unmap_mapping_range_t
>  void unmap_mapping_range(struct address_space *mapping,
>  		loff_t const holebegin, loff_t const holelen, int even_cows)
>  {
> -	struct zap_details details;
> +	struct zap_details details = { };
>  	pgoff_t hba = holebegin >> PAGE_SHIFT;
>  	pgoff_t hlen = (holelen + PAGE_SIZE - 1) >> PAGE_SHIFT;
>  

OK, I have added the following from mmots to linux-next today (though I
may not get a release done):

mm-oom-introduce-oom-reaper-fix-4-fix.patch
mm-oom-introduce-oom-reaper-fix-4.patch
mm-oom-introduce-oom-reaper-fix-5-fix.patch
mm-oom-introduce-oom-reaper-fix-5.patch
mm-oom-introduce-oom-reaper-fix-6.patch
mmoom-exclude-tif_memdie-processes-from-candidates.patch

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
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