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Date:      Mon, 02 Oct 2023 13:13:01 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 273715] dumpon: Kernel panic on boot when enabling dumpon over IP
Message-ID:  <bug-273715-227-9BqrHpxx9A@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-273715-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-273715-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D273715

--- Comment #8 from Michael Gmelin <grembo@FreeBSD.org> ---
(In reply to Mark Johnston from comment #6)

Hi,

Thank you for the fix.

I just checked, in 13.1 rcorder was:

  /etc/rc.d/sysctl
  /etc/rc.d/natd
  /etc/rc.d/dhclient
  /etc/rc.d/dumpon

while on 13.2 rcorder is:

  /etc/rc.d/sysctl
  /etc/rc.d/natd
  /etc/rc.d/dumpon
  /etc/rc.d/dhclient

So on 13.1, dumpon was called after interface renaming takes, while on 13.2,
device renaming happens after dumpon is started (which exposed the bug).

Without checking in more detail, this sounds like a plausible explanation.

It also means, that - even after applying the fix - it's not possible to ha=
ve a
dumpon configuration in /etc/rc.conf that will work during runtime (service
dumpon start) and also on boot, in case a renamed interface is used. This s=
eems
like something that would be worth addressing.

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