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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>