[Bug 285976] Kernel panic: domain is null

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285976

            Bug ID: 285976
           Summary: Kernel panic: domain is null
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: 0x1eef@protonmail.com

Hello!

I came across a kernel panic ("domain is NULL") when booting my system
recently. The panic occurs when bhyve starts, and I reduced the problem to this
commit:
2eeb95ccf39ac5d79326c4482112b6b7dd5fc8b2

When I revert 2eeb95ccf39ac5d79326c4482112b6b7dd5fc8b2 the panic disappears,
and I can use the VM as usual.

The VM in question is passing through a nvidia graphics card to a Linux VM in
case
it's relevant. I also have a nvidia patch applied, taken from
https://github.com/Beckhoff/freebsd-src/commits/phab/corvink/15.0/nvidia-wip in
case it's relevant.

If any more information is needed please let me know.

Regards,
Robert

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