From owner-freebsd-stable@freebsd.org  Wed Mar 28 14:35:54 2018
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Date: Wed, 28 Mar 2018 17:35:51 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Gregory Byshenk <freebsd@byshenk.net>
Cc: freebsd-stable@freebsd.org
Subject: Re: KBI unexpexted change in stable/11 ?
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On Wed, Mar 28, 2018 at 03:39:46PM +0200, Gregory Byshenk wrote:

> On Wed, Mar 28, 2018 at 04:09:04PM +0300, Slawa Olhovchenkov wrote:
> > I am upgrade system to latest -STABLE and now see kernel crash:
> > 
> > - loading virtualbox modules build on 11.1-RELEASE-p6
> > - loading nvidia module build on 11.1-RELEASE-p6 and start xdm
> > 
> > Is this expected? I am mean about loading modules builded on
> > 11.1-RELEASE on any 11.1-STABLE.
> 
> Did you rebuild your virtualbox and nvidia modules for your new
> kernel? If you build a new kernel, then you need to rebuild any
> modules that were installed from ports for the new version.

Only for -CURRENT, not for -STABLE:

https://lists.freebsd.org/pipermail/svn-src-all/2018-March/159649.html

John Baldwin: "In theory we try to not break existing kernel
modules on a stable branch.  That is, one should be able to kldload an
if_iwn.ko built on 11.0 on a 11-stable kernel."