panic: deadlres_td_sleep_q: possible deadlock detected on RPI3

[Ralf Wenk]

On 2020-01-25 at 7:32 -0800 bob prohaska wrote:
> On Thu, Jan 23, 2020 at 08:44:19AM -0800, bob prohaska wrote:
> > My Pi3 running -current r356835 reported:
> > 
> > panic: deadlres_td_sleep_q: possible deadlock detected for 0xfffffd0000eff000, blocked for 1800305 ticks
> > 
> [backtrace omitted]

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

Ralf