Hi
My guess would be that thinkfan gets corrupted data from 'somewhere',
and then some lack of bounds or type checking messes up other internal
variables and leads to corrupt data being written out.
In that case, and if you are 100% sure there is no spurious special
characters in any config files, it would have to be your hardware
sensors? Is it possible that some temperature sensor sometimes gives
complete bogus data? Can you try to monitor /proc/acpi/ibm/thermal with
a script or so and see if anything weird is going on?
Also, the severity seems way inflated. It doesn't look like it's a
widespread problem, and if it does get triggered, thinkfan seems to do
the right (/safe) thing and give up, returning control of fans to the
BIOS. Still, it would be nice to get to the bottom of this.
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