Joel Severin has announced
the availability of his port of the Linux kernel to WebAssembly; one can go
to this page and
watch it boot in a browser.

Wasm is similar to every other arch in Linux, but also
different. One important difference is that there is no way to
suspend execution of a task. There is a way around this though:
Linux supports up to 8k CPUs (or possibly more...). We can just
spin up a new CPU dedicated to each user task (process/thread) and
never preempt it

https://lwn.net/Articles/1044786/
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