bhyve VM suddenly stopped working (bhyve exited with status 4)

I

iskhakov-r

As the title says, my virtual machine (openbsd 7.9) suddenly stopped working and I have no clue why. I didn't change configuration I didn't change nothing, but after a random reboot it stopped starting and I was never able to get it running again no matter how many times I rebooted. If it helps somehow I was compiling some software from ports before I rebooted (and the VM stopped starting), but how could it possibly interfere the VM's wellbeing if everything is installed under /usr/local, and my VM is in /vm? I can't figure it out with just bhyve exited with status 4 - it doesn't help at all.

The first code block is openbsd79.conf, the second is vm-bhyve.log.

Code: 
loader="uefi"
uuid="0e545f58-56cc-11f1-8e1d-002b670a7ff9"

cpu=1
memory=512M

network0_type="virtio-net"
network0_switch="public"
network0_mac="58:9c:fc:09:4d:c3"

disk0_type="virtio-blk"
disk0_name="openbsd.img"

bhyve_options="-w"

passthru0="0/20/3"

This is a working configuration and I always used to launch the VM with it.

Code: 
2026-05-31T07:23:51+03:00: initialising
2026-05-31T07:23:51+03:00:  [loader: uefi]
2026-05-31T07:23:51+03:00:  [cpu: 1]
2026-05-31T07:23:51+03:00:  [memory: 512M]
2026-05-31T07:23:51+03:00:  [hostbridge: standard]
2026-05-31T07:23:51+03:00:  [com ports: com1]
2026-05-31T07:23:51+03:00:  [uuid: 0e545f58-56cc-11f1-8e1d-002b670a7ff9]
2026-05-31T07:23:51+03:00:  [debug mode: no]
2026-05-31T07:23:51+03:00:  [primary disk: openbsd.img]
2026-05-31T07:23:51+03:00:  [primary disk dev: file]
2026-05-31T07:23:51+03:00: initialising network device tap0
2026-05-31T07:23:51+03:00: adding tap0 -> bridge0 (public addm)
2026-05-31T07:23:51+03:00: bring up tap0 -> bridge0 (public addm)
2026-05-31T07:23:51+03:00: booting
2026-05-31T07:23:51+03:00:  [bhyve options: -c 1 -m 512M -AHPw -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd -w -U 0e545f58-56cc-11f1-8e1d-002b670a7ff9 -u -S]
2026-05-31T07:23:51+03:00:  [bhyve devices: -s 0,hostbridge -s 31,lpc -s 0:4:0,virtio-blk,/vm/openbsd79/openbsd.img -s 0:5:0,virtio-net,tap0,mac=58:9c:fc:09:4d:c3 -s 0:6:0,passthru,0/20/3]
2026-05-31T07:23:51+03:00:  [bhyve console: -l com1,/dev/nmdm-openbsd79.1A]
2026-05-31T07:23:51+03:00: starting bhyve (run 1)
2026-05-31T07:24:10+03:00: bhyve exited with status 4
2026-05-31T07:24:10+03:00: destroying network device tap0
2026-05-31T07:24:10+03:00: stopped

I am very new to bhyve and I have little experience in resolving such errors. Thank you in advance for your time.
 
I've also added debug="YES" to openbsd79.conf. The contents of a generated bhyve.log are:
Code: 
vm_run error -1, errno 22

The error code of 22 translates as "Invalid argument". It doesn't seem to be much useful either, it's jut a low-level response without much context. But an invalid argument to what exactly, anyway? And what is the exact argument that is invalid? Is there a way to make it more verbose? How do I troubleshoot further?
 
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