On Wed, Apr 23, 2014 at 7:49 AM, Dave Jones <davej@xxxxxxxxxx> wrote:
>
> So for reasons I can't figure out, I've not been able to hit it on 3.14
> The only 'interesting' thing I've hit in overnight testing is this, which
> I'm not sure if I've also seen in my .15rc testing, but it doesn't look
> familiar to me. (Though the vm oopses I've seen the last few months
> are starting to all blur together in my memory)
>
>
> kernel BUG at mm/mlock.c:82!
That's
mlock_vma_page:
BUG_ON(!PageLocked(page));
which is odd, because:
> Call Trace:
> [<ffffffffbe196612>] try_to_unmap_nonlinear+0x2a2/0x530
> [<ffffffffbe1972a7>] rmap_walk+0x157/0x320
> [<ffffffffbe1976e3>] try_to_unmap+0x93/0xf0
> [<ffffffffbe1bb8f6>] migrate_pages+0x3b6/0x7b0
All the calls to "try_to_unmap()" in mm/migrate.c are preceded by the pattern
if (!trylock_page(page)) {
....
lock_page(page);
}
where there are just a few "goto out" style cases for the "ok, we're
not going to wait for this page lock" in there.
Very odd. Does anybody see anything I missed?
Linus
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