panic: deadlres_td_sleep_q: possible deadlock detected on RPI3

[bob prohaska]

On Sun, Jan 26, 2020 at 08:42:11AM -0800, bob prohaska wrote:
> On Sun, Jan 26, 2020 at 11:31:47AM +0100, Ralf Wenk wrote:
> > 
> > I got this panic two times in a row with a r357112 kernel during
> > make installworld at the same place. So it looks like I am able to
> > reproduce it. 
> > 
> > # panic: deadlres_td_sleep_q: possible deadlock detected for
> >   0xfffffd0000f33560, blocked for 1802833 ticks
> > 
> > But I think it is just a symptom of the r356776 changes.
> > 
> > > Attempts to reboot are also rebuffed with 
> > > cpu_reset failed
> > > leaving a power cycle as the only option, which is new to me.
> > > 
> > > Does this give any hints as to what's going on?
> > 
> > After doing the update from r356767 to r356776 my system began to
> > show the "cpu_reset failed" message as well.
> > 
> > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243464
> > 
> 
My Pi3 still panics at r357204, but ntp seems to work fine.
One other oddity: During the loader countdown to boot, time
seems to run about 5x slower than it should, each second
on the screen taking about five seconds. The string 
deadlres_td_sleep_q turns up in sys/kern/kern_clock.c,
might there be a connection between the panic and the
very slow boot countdown?

Thanks for reading!

bob prohaska

> 
>