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Groups > linux.kernel > #1299077
| From | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: BUG: Bad rss-counter state mm:ffff8800c5a96000 idx:3 val:3894 |
| Date | 2015-12-29 19:40 +0100 |
| Message-ID | <qL7lE-49U-25@gated-at.bofh.it> (permalink) |
| References | <qJhIt-167-3@gated-at.bofh.it> <qL5jP-2Vk-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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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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