[Bug 258749] /etc/defaults/rc.conf says devmatch_blacklist doesn't need .ko, but it does

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 27 Sep 2021 18:11:09 UTC

            Bug ID: 258749
           Summary: /etc/defaults/rc.conf says devmatch_blacklist doesn't
                    need .ko, but it does
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: bugs@FreeBSD.org
          Reporter: mwlucas@michaelwlucas.com

Not sure what the correct behavior is, so I'm pointing out the inconsistency
and letting y'all decide. /etc/defaults/rc.conf says:

devmatch_blacklist=""   # List of modules (w/o .ko) to exclude from devmatch.

This appears to be incorrect.

Thanks to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253175 I had to
disable virtio_random on my new VM at install time. I set


and the module was loaded anyway.

devmatch_blacklist="virtio_random.ko" prevented the module from being loaded.

So, either the script is working wrong or the comment is incorrect.

I checked rc.conf(5) for a tiebreaker, but it doesn't specifically mention .ko.

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