On Mon, 8 Jan 2018, Ingo Molnar wrote: > > Note that the page table isolation (PTI) feature has a number of effects on > perf > and on NMI handlers, so one of the things to try would be to disable PTI.
Yes, it seems to be a KPTI issue. With KPTI disabled I can fuzz for a few hours, no problems. With KPTI enabled the perf_fuzzer on this haswell machine will lock up within minutes. It's a hard lockup with nothing over the serial console. It is not deterministic/reproducible either. Vince
