Hi Gilles,

dynamic printf backend selection is a suboptimal idea when you want
chronological output (not that uncommon during debugging). The native
printf may actually hit the screen (or the log file) before some earlier
queued rt_printf message because the dump thread is busy or has a lower

It's ok to do native printf for non-shadows. But once a thread was
mapped, printf needs to go through the rt queue, even in secondary mode.


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