(In reply to Thomas DEBESSE from comment #6)
> Hi, thank you for your answer, does this mean there is no fix possible to
> prevent the driver to burn the cpu in case of hang?

No, not really.

We should of course try to fix the hang and that's why I think we should keep
this bug open, but driver bugs like this can always happen and not only in
radeon but other kernel drivers as well.

As I said that's why dedicated hardware independent of the main CPU is usually
used for things like this.

IIRC there is also a rather big warning in the fancontrol manual about this.