Comment 577 for bug 1690085
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e3ace39
(Get the code!)
From my experience (a Ryzen 1700X on a MSI B350 motherboard) the freezes on IDLE, like the ones described from Trevor Cordes, went way once I changed the "Idle: typical" setting on the BIOS.
I had the bug before the BIOS setting appeared, and tried many things with more or less success. But the best solution by far is just to change the BIOS setting. I have many months of uptime without any lock up since then. *It should be the first thing to test if your computer freezes by itself on idle*.
On the other hand I have a Threadripper that freezes when doing hard computations (that alternate between high CPU usage and low, because it needs to write temporary results to disk). This can not be solved using the "Idle: typical" BIOS option. This other freeze happens specially when using Matlab. I am starting to think that the problem is that Matlab (or the MKL Blas libraryit uses) might use heavily SSE3 instructions that have the MWAIT instruction as cited by Francesco Buscani above. I should try the kernel option "idle=mnowait" to see if I can get rid of these freezes. Unfortunately I am travelling until the end of the month and away from the Threadrippers to test it.