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The fan speed is controlled by software, which looks at temperatures around the machine and adjusts the fans as appropriate. When you get a kernel panic, the software isn't there to pay attention to the temperature sensors. So the hardware has a failsafe mechanism, which cranks the fan speed up when the software stops talking to it in order to ensure that the thing doesn't melt.
The real issue is the kernel panic; the fans are secondary.
I used to get kernel panics if I left Logic running overnight (probably a bug in the MOTU driver, since it's more-or-less impossible for an application to cause a kernel panic directly without a bug down in the bowels somewhere.) I stopped leaving Logic running when I walked away, and the thing hasn't crashed in months.
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