Text mode screen (notable for the underscore…) means Xorg has crashed, or the system has frozen without being able to start Xorg.
Note - you won’t get much useful info from stdout/stderr with Xorg. The juicy stuff gets logged - /var/log/Xorg.0.log usually. If it’s just your input that’s getting locked then there’s a good chance you’ll get a lot of info there, as opposed to if this is a hard lockup on the VM.
If you’ve got 2-way network connectivity between the host and guest (such as the VM uses a vnet device on a host bridge) then check to see if you have connectivity to the VM after the crash (assuming you have it before). If connectivity is lost, then it’s likely a hard lockup. If you still have connectivity then there’s a good chance that some good stuff got logged by Xorg…
Lastly, check out issue 6091 on void-packages. The symptoms match (Xorg crash, input is lost) and it’s worth checking, if only to rule it out.