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Date:      Fri, 17 Aug 2018 10:54:49 +0200
From:      Michael Gmelin <freebsd@grem.de>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        Konstantin Belousov <kostikbel@gmail.com>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, Matthias Apitz <guru@unixarea.de>
Subject:   Re: Fatal trap 12: page fault on Acer Chromebook 720 (peppy)
Message-ID:  <07E28AC5-EBE6-4893-810A-6C03F07925C8@grem.de>
In-Reply-To: <e82ed552-83b0-5331-3117-6750b8c205f7@FreeBSD.org>
References:  <20180603215020.452a81d8@bsd64.grem.de> <20180603205340.GS3789@kib.kiev.ua> <20180604004632.56ca6afa@bsd64.grem.de> <20180604110654.GA2450@kib.kiev.ua> <20180604231756.2ed2adb9@bsd64.grem.de> <20180605131135.GH2450@kib.kiev.ua> <20180606010625.62632920@bsd64.grem.de> <20180815005106.69402d23@bsd64.grem.de> <20180815130447.GZ2340@kib.kiev.ua> <C26CD25D-3CB0-4F7E-8B50-F7E95E16B776@grem.de> <20180815135531.GA2340@kib.kiev.ua> <FAEA5B0A-5302-4A48-B322-21CB0D97C8CC@grem.de> <e82ed552-83b0-5331-3117-6750b8c205f7@FreeBSD.org>

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> On 17. Aug 2018, at 08:17, John Baldwin <jhb@FreeBSD.org> wrote:
>=20
>> On 8/16/18 1:58 PM, Michael Gmelin wrote:
>>=20
>>=20
>>> On 15. Aug 2018, at 15:55, Konstantin Belousov <kostikbel@gmail.com <mai=
lto:kostikbel@gmail.com>> wrote:
>>>=20
>>>> On Wed, Aug 15, 2018 at 03:52:37PM +0200, Michael Gmelin wrote:
>>>>=20
>>>>=20
>>>>>> On 15. Aug 2018, at 15:04, Konstantin Belousov <kostikbel@gmail.com <=
mailto:kostikbel@gmail.com>> wrote:
>>>>>>=20
>>>>>> On Wed, Aug 15, 2018 at 12:51:06AM +0200, Michael Gmelin wrote:
>>>>>> Reviving this old thread, since I just updated to r337818 and a simil=
ar
>>>>>> problem is happening again. Since the fix in r334799 (review
>>>>>> https://reviews.freebsd.org/D15675) (mp_)machdep.c have been touched,=

>>>>>> so maybe this is related
>>>>>> (https://svnweb.freebsd.org/base?view=3Drevision&revision=3D334799).
>>>>>>=20
>>>>>> Please see the screenshot of the panic below:
>>>>>> https://gist.github.com/grembo/78d0f2a100dd4f16775b85a118769658
>>>>>>=20
>>>>>> This is me not digging any deeper, hoping that this is something
>>>>>> obvious. Please let me know if you need more input.
>>>>>=20
>>>>> I do not see how recent mp_machdep.c changes could affect this.
>>>>> Can you try newest kernel but old loader ?
>>>>=20
>>>> I will try (but that will take a while). Oh, also, it still boots in sa=
ve mode/with smp disabled.
>>>=20
>>> Right, this is because the access to that address through DMAP is only
>>> needed when configuring AP startup resources.
>>>=20
>>> Also, I think it is safe to suggest that the bisect is needed.
>>=20
>> Using an older loader didn=E2=80=99t help, but I identified the problem:
>>=20
>> https://svnweb.freebsd.org/base?view=3Drevision&revision=3D334952
>>=20
>> modified the code you introduced in
>>=20
>> https://svnweb.freebsd.org/base?view=3Drevision&revision=3D334799
>>=20
>> By correcting units to pages it also broke booting the Chromebook as a si=
de effect - so the previous fix just worked due to a bug it seems.
>>=20
>> Is there an easy way to output the content of physmap at that point (debu=
g.late_console=3D0 doesn=E2=80=99t work) - like an existing buffer I could u=
se, or would this be more elaborate (I did something complicated last time b=
ut didn=E2=80=99t save it, so any simple solution would be preferred).
>=20
> How about reverting the commit for now so you get a working console
> and print out the physmap array values along with Maxmem later in
> the boot (or just use kgdb to examine them once the system is running)?
>=20

This is before the system has a working console (part of calling getmem...),=
 disabling late console makes it hang, physmap changes afterwards, so runnin=
g kgdb later doesn=E2=80=99t help. Last time I kept a copy of physmap and lo=
gged it later to know the original content. I can do that again, I just thou=
ght maybe there is a simple mechanism I=E2=80=99m not aware of that would sa=
ve me some time.

Thanks,
Michael





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