On Sat, Mar 18, 2023 at 02:33:30PM +0800, Lai Jiangshan wrote: > If there is no other concrete reason other than overflowing for > assigning NMI and #DB with a stack level > 0, #VE should also > be assigned with a stack level > 0, and #BP too. #VE can happen > anytime and anywhere, so it is subject to overflowing too. So #BP needs the stack-gap (redzone) for text_poke_bp(). #BP can end up in kprobes which can then end up in ftrace/perf, depending on how it's all wired up. #VE is currently a trainwreck vs NMI/MCE, but I think FRED solves the worst of that. I'm not exactly sure how deep the #VE handler goes.
