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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Justin Hibbits <jhibbits@freebsd.org>
cc: Tamiji Homma <tamiji@me.com>, freebsd-ppc@freebsd.org
Subject: Re: FreeBSD 11 on PowerBook G4
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 <20161108205349.1b5b26a6@zhabar.knownspace>
Comments: In-reply-to Justin Hibbits <jhibbits@freebsd.org>
 message dated "Tue, 08 Nov 2016 20:53:49 -0600"
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Date: Sun, 15 Jan 2017 16:16:25 -0500
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Justin Hibbits <jhibbits@freebsd.org> writes:
> Tamiji Homma <tamiji@me.com> wrote:
>> Since it reboots spontaneously, I couldn’t write it down.  I
>> video-captured screen and took a snapshot.
>> Here is screenshot fatal kernel trap.
>> http://www.pbase.com/tammyhomma/image/164488840/original 
>> 
>> Anyone seen this?

> Unfortunately, you're in good company with that panic.  I've seen that
> since at least February on my PowerBook, but haven't made the time to
> track it down (11-CURRENT from mid-October 2015 worked fine).  On the
> bright side, though, 12-CURRENT as of October 31 works fine on my
> PowerBook.  I still don't have the time to bisect and track down the
> cause of the problem or the fix, but if you feel like bisecting and
> trying to find the snapshot that fixes the problem, that could help
> narrow down where it got fixed, and a fix could be backported to
> 11-STABLE.

I took up the challenge of bisecting this, and it appears to be a
two-year-old fault in the ofwfb screen driver.  It is *NOT* fixed
in CURRENT, at least not as of yesterday.  Details at
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216123

			regards, tom lane