@iska Decided to play around with it more. Apparently there is gnumach-smp in non-snapshot port repos, but it immediately crashes with some APIC assertion error unless I change disk type from IDE to SATA (apparently Hurd supports later, that's surprising). But then for whatever reason they has different disk names, sd0 on up kernel and wd0 on smp so it looks like I have to change fstab every time I need to switch between kernels (adding both with errors=continue results in hang on boot). Also framebuffer corruption hasn't gone anywhere, but I at least can manually start ssh by blindly logging in. htop on SMP kernel still shows only 1 CPU, so not sure if it even works.