hwpstate_intel hangs kernel

[Diane Bruce]

On Wed, Feb 05, 2020 at 02:45:50PM +0100, Andreas Nilsson wrote:

Ok I am going to respond to this old email from February..

> Hello,
> 
> I upgraded to a newer version,  git 87d669d3863-c266265, and I do not
> experience the random hang anymore. The machine still hangs on boot on
> "hwpstate_intel0: <Intel Speed Shift> on cpu0" unless I set
> 'hint.hwpstate_intel.0.disabled="1"' in loader.conf.
> 

As a few others know on IRC I ran into exactly this same problem
on a brand new Lenovo Carbon. I missed this thread somehow.
I also had to bisect the commit. Would it be possible to put
a note into UPDATING and default to disabled=1 for now? ;)

...
> 
> Best regards
> Andreas
> 
> On Sat, Feb 1, 2020 at 11:26 PM Andreas Nilsson <andrnils at gmail.com> wrote:
> 
> > Hello Conrad,
> >
> > thank you Andrey for bisecting! I'll try with that hint and see how it
> > works for me.
> >
> > Best regards
> > Andreas
> >
> > On Sat, Feb 1, 2020, 18:18 Conrad Meyer <cem at freebsd.org> wrote:
> >
> >> Hi Andrey,
> >>
> >> Please try 'hint.hwpstate_intel.0.disabled="1"' as a workaround for now.
> >>
> >> I think I have identified at least one problematic piece of code,
> >> although I don't know if it's the root cause.  I will go ahead and fix
> >> that, which may not fix the hang, and also add some debug printfs that
> >> can be enabled to help identify the real issue.
> >>
> >> Thanks for the report and bisect.
> >>
> >> Best,
> >> Conrad
> >>
> >> On Sat, Feb 1, 2020 at 6:06 AM Andrey V. Elsukov <bu7cher at yandex.ru>
> >> wrote:
> >> >
> >> > 31.01.2020 18:11, Andrey V. Elsukov пишет:
> >> > > On 24.01.2020 19:52, Andreas Nilsson wrote:
> >> > >> It hangs during kernel boot and the last message printed on console
> >> is:
> >> > >> hwpstate_intel0: <Intel Speed Shift> on cpu0
> >> > >
> >> > > Hi,
> >> > >
> >> > > Did you find the cause of this hang?
> >> > > I also tried to update today from r350816 to r357330. But my Lenovo X1
> >> > > Carbon 4th hangs on the same message.
> >> > >
> >> >
> >> > Hi,
> >> >
> >> > I have bisected the bad commit, it is r357002.

Yep. I also had to bisect this from what is now some 5 months ago :-(

Diane
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