Fix for async_probe module param added in 4.3 (clearly not widely used yet),

and a much more interesting kallsyms race which has been around approximately
forever.  This fix is more invasive, and will require some care in backporting,
but I hated all the bandaids I could think of, so...

There are some more coming, which are only for breakages introduced this
cycle (livepatch), but wanted these in now.

Thanks,
Rusty.
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