It sounds like you are experiencing an issue with running OpenBSD as a guest operating system on a Linux KVM (Kernel-based Virtual Machine) host. When you try to start the guest, it hangs at the point where it is supposed to start the tty (terminal) flags.
There could be a number of reasons why this is happening. Here are a few potential causes and steps you can take to troubleshoot and resolve the issue:
Check the OpenBSD guest logs for any error messages or other clues about what might be causing the issue. You can try accessing the logs by booting the guest in single-user mode and looking at the console output.
Check the configuration of the Linux KVM host and make sure that it is set up correctly for running OpenBSD as a guest. This includes checking the virtual machine's memory, CPU, and network settings, as well as ensuring that the correct virtualization drivers and other necessary components are installed on the host.
Check for any known issues or compatibility issues with running OpenBSD as a guest on Linux KVM. You may be able to find more information about this by searching online or checking the OpenBSD and KVM documentation.
Try booting the OpenBSD guest in a different virtualization software, such as VirtualBox or VMware, to see if the issue persists. If it does not, the problem may be specific to the combination of OpenBSD and Linux KVM.
If none of these steps help, you may want to consider seeking additional assistance from the OpenBSD or Linux KVM communities. There may be other users who have experienced similar issues and can offer further guidance or suggestions for resolving the problem.