Ubuntu's 4.15.0-66 has this bug, yes. -65 is safe and -67 will have the fix.

On Tue, Oct 29, 2019 at 4:54 PM Patrick Donnelly <pdonnell@redhat.com> wrote:
>
> On Mon, Oct 28, 2019 at 11:33 PM Lars Täuber <taeuber@bbaw.de> wrote:
> >
> > Hi!
> >
> > What kind of client (kernel vs. FUSE) do you use?
> > I experience a lot of the following problems with the most recent ubuntu 18.04.3 kernel 4.15.0-66-generic :
> > kernel: [260144.644232] cache_from_obj: Wrong slab cache. inode_cache but object is from ceph_inode_info
> >
> > Other clients with older kernels (e.g. 4.15.0-47-generic) work without interruption on the same CephFS.
>
> Sounds like another issue reported on ceph-users: "[ceph-users] CephFS
> kernel module lockups in Ubuntu linux-image-5.0.0-32-generic?"
>
> Suggest you contact Canonical to get them to fix their kernel or
> downgrade your kernel.
>
> --
> Patrick Donnelly, Ph.D.
> He / Him / His
> Senior Software Engineer
> Red Hat Sunnyvale, CA
> GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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