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

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

--- Comment #5 from Mateusz Guzik <mjg@FreeBSD.org> ---
So cdp is backed by dev, but freeing dev is decoupled from unlinking it from
the global cdp list and it may be some of the frees happen when they should
not. There is very funky refcount scheme in there which pins cdp in a way which
does not pin dev(???).

That said I would start with adding a bool to dev indicating that cdp is
hanging out on the list (or not). Then assert it is not when freeing.

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