[Bug 273418] [panic] Repeating kernel panic on open(/dev/console)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273418

--- Comment #18 from Jason A. Harmening <jah@FreeBSD.org> ---
Shouldn't the asserts in my proposed patch already accomplish what we need
here?

It may not be truly necessary to add a new flag solely tracking active list
membership (vs. CDP_ACTIVE), but it seemed worth doing given that a devnode can
be marked inactive while still on cdevp_list.  Beyond that, the patch already
has:

1) An assert that the node isn't on cdevp_list when devfs_free() is called,
which is probably the critical case here due to incorrect (un)referencing.

2) Asserts in the other places that add or remove from cdevp_list, to catch
other incorrect behavior e.g. trying add a node to the tail of the list when
it's already elsewhere on the list.

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