On Mon, 6 Jul 2020 13:20:27 +0800, sunshilong wrote: >I wonder why NMIs could stall the CPU. Could you please explain that in >more detail? Due to hardware issues? No I can't explain. An insightful document, especially page 57: http://www.rdrop.com/~paulmck/RCU/stallwarning.2018.01.22a.pdf