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    SubjectRe: bad rss-counter message in 3.14rc5
    On Tue, 18 Mar 2014, Sasha Levin wrote:
    > 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.

    Great, thanks a lot, Sasha. I was afraid that you'd hit those swapops
    BUGs, which seemed perhaps to be paired with these; but glad to hear
    a positive. Let's see how Dave fares. (I've not forgotten shmem
    fallocate, by the way, but those probably aren't as high on my agenda
    as you'd like.)

    Hugh


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