Hi Jari
Sorry for the delay, just returned after a long vacation.
On Thu, Jan 16, 2020 at 08:55:52AM +0200, Jari Ruusu wrote:
On 1/15/20, Linus Torvalds torvalds@linux-foundation.org wrote:
However, the most likely cause is that you have a borderline dodgy system, and the microcode update then just triggers a pre-existing problem.
For that particular processor model, there appears to be microcode updates for four steppings: 9 10 11 and 12. My model is stepping 9, so it appears to be early commercially sold version of that model. Probably more problems on it than on later steppings.
I don't suspect the alignment issue during microcode load to trigger any hangs after couple days. Its only used to copy to some internal store. So once the ucode is loaded and if you look at /proc/cpuinfo and it reflects the latest microcode you are past the alignment issue. I suspect its something else.
Can you please also document the OEM, BIOS versions, and also both the old and new microcode versions after the update.
Would suggest logging the hang issue in public github for microcode issues. This would let the product folks look at them.
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files
But it might be worth it if the intel people could check up with their microcode people on this anyway - if there is _one_ report of "my system locks up with newer ucode", that's one thing. But if Jari isn't alone...
Cheers, Ashok