[Soekris] "Lockup" update

[der Mouse]

> I quite frankly have no idea under which circumstances process
> scheduling would fail under a kernel which is otherwise still
> running.

I don't think I've seen that, strictly, but I have seen failure modes
which have much the same effect (no userland processes running but the
kernel proper is still up).  For example, I once saw a failure mode
which ended up locking up all disk access.  Anything that was running
could run as long as it never touched the disk, but try to page, try to
open a file, anything, and that process wedged hard.  Not strictly a
scheduler failure, but the end effect was pretty much the same.

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