Hi Kurt, On Fri, 5 Jun 2020 at 15:57, Kurt Kanzenbach <kurt.kanzenbach@xxxxxxxxxxxxx> wrote: > > Hi Vladimir, > > On Fri Jun 05 2020, Vladimir Oltean wrote: > > Hi, > > > > I was testing stress-ng on an ARM64 box and I found that it can be killed instantaneously with a --hrtimers 1 test: > > https://github.com/ColinIanKing/stress-ng/blob/master/stress-hrtimers.c > > The console shell locks up immediately after starting the process, and I get this rcu_preempt splat after 21 seconds, > > letting me know that the grace-periods kernel thread could not run: > > interesting. Just tested this on an ARM64 box with v5.6-rt and the > stress-ng hrtimer test works fine. No lockups, cyclictest results are > looking good. So maybe this is v5.7 related. > > Thanks, > Kurt This is not actually v5.7 related. I could also reproduce it on a downstream 5.4 kernel which is how I originally saw it. Thanks, -Vladimir
