Re: bad rss-counter message in 3.14rc5

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On 03/18/2014 08:38 PM, Hugh Dickins wrote:
On Tue, 11 Mar 2014, Dave Jones wrote:
On Tue, Mar 11, 2014 at 09:36:03PM +0400, Cyrill Gorcunov wrote:
  > On Tue, Mar 11, 2014 at 01:10:45PM -0400, Dave Jones wrote:
  > >  >
  > >  > Dave, iirc trinity can write log file pointing which exactly syscall sequence
  > >  > was passed, right? Share it too please.
  > >
  > > Hm, I may have been mistaken, and the damage was done by a previous run.
  > > I went from being able to reproduce it almost instantly to now not being able
  > > to reproduce it at all.  Will keep trying.
  >
  > Sasha already gave a link to the syscalls sequence, so no rush.

It'd be nice to get a more concise reproducer, his list had a little of everything in there.

I've so far failed to find any explanation for your swapops.h BUG;
but believe I have identified one cause for "Bad rss-counter"s.

My hunch is that the swapops.h BUG is "nearby", but I just cannot
fit it together (the swapops.h BUG comes when rmap cannot find all
all the migration entries it inserted earlier: it's a very useful
BUG for validating rmap).

Untested patch below: I can't quite say Reported-by, because it may
not even be one that you and Sasha have been seeing; but I'm hopeful,
remap_file_pages is in the list.

Please give this a try, preferably on 3.14-rc or earlier: I've never
seen "Bad rss-counter"s there myself (trinity uses remap_file_pages
a lot more than most of us); but have seen them on mmotm/next, so
some other trigger is coming up there, I'll worry about that once
it reaches 3.15-rc.

The patch fixed the "Bad rss-counter" errors I've been seeing both in
3.14-rc7 and -next.


Thanks,
Sasha

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