Linux detects the fdiv bug, and lets you know in case your application
cares, but it doesn't fix it. This one doesn't lock up the machine,
it's just an arithmetic problem.
The bug it protects against is the f00f bug, which does lock up the
machine without the protection. This bug doesn't occur until someone
deliberately runs an f00f instruction (or some variant), so it's not
likely to affect booting.
It may be, however, that the protection code has a bug, and when it is
turned on it locks up the machine.
-- Jamie
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