On Fri, Jan 10, 2025 at 05:19:54PM +0100, David Hildenbrand wrote: > On 10.01.25 17:14, Matthew Wilcox wrote: > > On Fri, Jan 10, 2025 at 04:48:03PM +0100, David Hildenbrand wrote: > > > If I would have to guess, I would assume that we have a refcount issue such > > > that we succeed in splitting a folio while concurrently mapping it. > > > > That would seem hard to accomplish, because both hold the folio lock, > > so it wouldn't be just a refcount bug but also a locking bug. Not sure > > what this is though. > > Yeah, but we also have > > https://lkml.kernel.org/r/6774bf44.050a0220.25abdd.098a.GAE@xxxxxxxxxx That one is a UAF on the vma, so it's either a different issue, or the problem is with the VMA refcount/lookup/..., not the folio refcount. cc'ing the relevant maintainers.
