[Bug 288885] System locks up when starting a bhyve guest under Linux/KVM

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 15 Aug 2025 18:14:44 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288885

            Bug ID: 288885
           Summary: System locks up when starting a bhyve guest under
                    Linux/KVM
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: dwmw2@infradead.org

I started FreeBSD-14.3 as a VM under Linux, with nested virt enabled.
Theoretically nested virt isn't anything for FreeBSD to worry about; it just
sees that the CPU it's running has the VMX extensions, and uses them. It's only
the L0 bare metal hypervisor that has to care about nested.

The FreeBSD VM immediately locks up as soon as I try to start bhyve in it.

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