[Bug 268393] system always reboots once from a powered off state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268393

--- Comment #28 from Jonathan Vasquez <jon@xyinn.org> ---
Hey John,

That sounds good, will do. Do you want me to run this with the `snd_hda`
automatically being loaded as normal, or from the MINIMAL kernel? I'm guessing
I'll need to enable WITNESS and other debugging features for this to be
displayed? Could you give me a list of your suggested debugging options so I
can add them to my MINIMAL kernel config? Thank you!

I also noticed something today (an anamoly but still interesting). Today when I
booted my machine from a cold boot (for the first time this morning), the
system didn't crash. I suspect this may be because yesterday when I powered off
my machine, FreeBSD didn't actually shut down completely when I did the
`poweroff` command. Usually when I run that command (which is my normal way of
shutting down the machine for the most part), it would run its normal shutdown
sequence, and it would say "all buffers synced" at the end, and then power off
the machine completely. Yesterday it displayed everything up to "all buffers
synced", but it got stuck and didn't shut down (almost as if it did a `halt`
instead of a `poweroff`). After that, I hard powered off the machine by holding
the power button, and that was the end of that until this morning. I wonder if
there was some type of state remaining some way even though it was powered off
completely. Doing another `poweroff` this morning correctly shutdown the
machine, and turning it back on allowed the crash to re-occur. Weird, but
noteworthy of a mention.

- Jonathan

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