panic: deadlres_td_sleep_q: possible deadlock detected on RPI3
Paul Mather
paul at gromit.dlib.vt.edu
Thu Jan 30 16:39:50 UTC 2020
On Jan 30, 2020, at 11:20 AM, bob prohaska <fbsd at www.zefox.net> wrote:
> 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?
I don't get a panic on my Pi 3, but the really odd thing is that for quite a while I USED to get that slow boot loader countdown that you describe. Now, it has gone away. I first noticed it gone at r357051, and it is still gone after I updated very recently due to the security advisories. (I'm now at r357230 on 12-STABLE.)
Cheers,
Paul.
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