On Wed, Oct 26, 2022 at 11:38:53AM -0700, Alexander Potapenko wrote: > A bigger issue from the NMI perspective is probably > having __msan_poison_alloca() inserted in every non-noinstr kernel > function, because that hook may acquire the stackdepot lock. *urgghhh* that's broken, that must not be. There is a *TON* of NMI functions that are non-noinstr. What's worse, it seems to do a memory allocation as well, and that's out the window with PREEMPT_RT where you can't do even GFP_ATOMIC from regular IRQ context. That function is wholly unacceptable to be added to every kernel function.
