[ Moving fuse-devel and linux-fsdevel to Bcc ] Hello linux-mm people, I am posting this here as advised by Miklos (see below). In short, I have a workload that reliably produces kernel messages of the form: [ 2562.773181] fuse: trying to steal weird page [ 2562.773187] page=<something> index=<something> flags=17ffffc00000ad, count=1, mapcount=0, mapping= (null) What are the implications of this message? Is something activelly going wrong (aka do I need to worry about data integrity)? Is there something I can do to help debugging (and hopefully fixing) this? This is with kernel 4.18 (from Ubuntu cosmic). Best, -Nikolaus On Feb 26 2019, Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > On Tue, Feb 26, 2019 at 1:57 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote: >> >> On Mon, Feb 25, 2019 at 10:41 PM Nikolaus Rath <Nikolaus@xxxxxxxx> wrote: >> > >> > On Feb 12 2019, Nikolaus Rath <Nikolaus@xxxxxxxx> wrote: >> > > On Feb 12 2019, Miklos Szeredi <miklos@xxxxxxxxxx> wrote: >> > >> On Sun, Feb 10, 2019 at 11:05 PM Nikolaus Rath <Nikolaus@xxxxxxxx> wrote: >> > >> >> > >>> Bad news. I can now reliably reproduce the issue again. >> > >> >> > >> A reliable reproducer is always good news. Are the messages exactly >> > >> the same as last time (value of flags, etc)? >> > > >> > > The flags, count, mapcount and mapping values are always the same. The >> > > page and index is varying. So the general format is: >> > > >> > > [ 2562.773181] fuse: trying to steal weird page >> > > [ 2562.773187] page=<something> index=<something> >> > > flags=17ffffc00000ad, count=1, mapcount=0, mapping= (null) >> > >> > Is there anything else I can do to help debugging this? >> >> Could you please try the attached patch? > > Looking more, it's very unlikely to help. remove_mapping() should > already ensure that the page count is 1. > > I think this bug report needs to be forwarded to the > <linux-mm@xxxxxxxxx> mailing list as this appears to be a race > somewhere in the memory management subsystem and fuse is only making > it visible due to its sanity checking in the page stealing code. > > Thanks, > Miklos > > > -- > fuse-devel mailing list > To unsubscribe or subscribe, visit https://lists.sourceforge.net/lists/listinfo/fuse-devel -- GPG Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F »Time flies like an arrow, fruit flies like a Banana.«
