On Thu Oct 13, 2022 at 10:21 AM AEST, Guenter Roeck wrote: > On Thu, Oct 13, 2022 at 11:03:34AM +1100, Michael Ellerman wrote: > > Guenter Roeck <li...@roeck-us.net> writes: > > > On Wed, Oct 12, 2022 at 11:20:38AM -0600, Jason A. Donenfeld wrote: > > >> > > >> I've also managed to not hit this bug a few times. When it triggers, > > >> after "kprobes: kprobe jump-optimization is enabled. All kprobes are > > >> optimized if possible.", there's a long hang - tens seconds before it > > >> continues. When it doesn't trigger, there's no hang at that point in the > > >> boot process. > > >> > > > > > > I managed to bisect the problem. See below for results. Reverting the > > > offending patch fixes the problem for me. > > > > Thanks. > > > > This is probably down to me/us not testing with PREEMPT enabled enough. > > > Not sure. My configuration has > > CONFIG_PREEMPT_NONE=y > # CONFIG_PREEMPT_VOLUNTARY is not set > # CONFIG_PREEMPT is not set
Okay I reproduced it, just takes a while to hit. Thanks, Nick
