Re: panic in wscons booting current evbarm64 iso under virtualization on Apple Silicon

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

On Sun, Oct 25, 2026 at 05:34:55PM -0700, Chris Hanson wrote:
> I’m getting a panic trying to boot an ISO that I built locally from -current in a VM using UTM.app on Apple Silicon on my M2 MacBook Air running macOS 27.0.1. (UTM.app is a front-end for QEMU and Apple’s virtualization support.) My local build has only some 68K changes, the most recent mainline commit it contains is "alpha: Align kernel stack pointer to 16-byte boundaries”.
> 
> Based on the attached transcript (mostly dmesg and backtrace), does this point more to an issue in VirtIO, the ARM64 port, or wscons?
> 

It looks like what happened is genfb(4) called wsdisplay_cnattach(), and
then viogpu(4) called it again, and wsdisplay_cnattach() insists on only
being called once.  The question becomes why both genfb and viogpu are
trying to run what's probably the same framebuffer as console.