Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

[Peter Zijlstra]

On Mon, Jan 08, 2018 at 03:29:42PM -0500, Vince Weaver wrote:
> 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.

I'll go take a look...