On Thu, Aug 02 2018 at 5:52pm -0400, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > On Thu, Aug 2, 2018 at 2:39 PM WGH <wgh@xxxxxxxxx> wrote: > > > > I've just found one public report of this bug, though: > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900442 > > Yeah, it does sound like we should fix this issue. Debian is notorious for having a stale and/or custom lvm2. Generally speaking, it is recommended that lvm2 not be older than the kernel (but the opposite is fine). Given the narrow scope of users impacted (read-only snapshot creation is very niche, certainly not the default): I don't think it is worth making fiddly changes in dm-snapshot to warn the user and override the permissions for the cow device. Mike
