On Thu, 02 Mar 2017 00:50:52 -0000
[email protected] wrote:

> I run Fedora 25 on my laptop,on a dedicated partition,other OSs on
> other partitions,and a strange thing happens:
> 
> On my Fedora 25 /boot/ directory I only have kernels 4.2.3 and 4.9.12
> the most recent(and a rescue kernel not numbered).However Grub2 shows
> 3 entries for kernel 4.8.6,4.2.3,4.9.12.I tried to get rid of 4.8.6
> but rpm -qi kernel or rpm -qi kernel-core only show kernels 4.2.3 and
> 4.9.12.The same using dnf.The kernel 4.8.6 does not appear on /boot
> directory nor with rpm,dnf or anything I tried.This is really a
> stealth kernel and I do not know where it stands,in the first
> place,to get rid of it.
> 
> When I choose the corresponding GRUB2 menu entry this kernel 4.8.6
> shows that it is real.With uname --all it appears as the active
> kernel.

I think you must have interrupted a kernel update at some point; after
install, but before completion. You could try rebuilding the rpm
database; as root run
rpm --rebuilddb

You could try the dnf equivalent of the yum package-cleanup commands.
dnf repoquery --unsatisfied
dnf repoquery --installonly
to see what kinds of results you get.  They are documented in 
man yum2dnf

If you go back through /var/log/dnf.log.*, is there any kind of report
of irregularity when the 4.8.6 kernel is being installed?

Just some ideas.
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