On Mon, May 13, 2019 at 10:39:21PM +0200, Ludovic Court�s wrote: > I suspect ZFS-on-Linux (right?) is doing something unusual here: I suppose it is ZFS on Linux; it is Linux, I can ask the admins if it could be something else. > What do the following commands do on this system? > > --8<---------------cut here---------------start------------->8--- > $ mkdir -p /tmp/test/lib > $ unshare -mrf mount /lib /tmp/test/lib -o bind,readonly > --8<---------------cut here---------------end--------------->8--- > [f_pelz12@tux6 ~]$ mkdir -p /tmp/test/lib [f_pelz12@tux6 ~]$ unshare -mrf mount /lib /tmp/test/lib -o bind,readonly unshare: cannot change root filesystem propagation: Permission denied Thank *you*, Ludo! A working guix pack would be helpful for me. Regards, Florian