It was suggestions from the subreddit and irc that it's probably a harddrive failure. The kernel devs wanted some more details, but at that point I had already deleted OpenBSD and gone back to Alpine. I might give it a spin again later and if the error happens, I'll be sure to include the full panic report.

Thanks for suggesting smart, I gave it a spin and it seems the harddrive is healthy?

$ doas smartctl -H /dev/nvme0n1
=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

My new suspicion is that I did something funky with the kernel parameters and fstab to try and speed up the system which made it panic.

Really nice. We're in the process of setting up office tooling for my work, and there is little competition for Google Suite, since it's cheap as hell and includes so much. Some competition in the space is very welcome.

One thing that scares me about proton is that git send-email seems to not work great (at least according to git-send-email.io). Anyone knows if that is still accurate?

I wish haha. I love their work and philosophy but kept getting kernel panics when using OpenBSD. Support told me it's a harddrive failure, but my system works just fine with Linux. Oh well, Alpine is nice in that loksh, doas, cwm are all well supported and the installer feels very similar to OpenBSD