Date: Sat, 12 Mar 2016 13:02:16 +0100 From: =?UTF-8?Q?Jean-S=c3=a9bastien_P=c3=a9dron?= <jean-sebastien.pedron@dumbbell.fr> To: freebsd-x11@freebsd.org Subject: Re: i915 update to Linux 3.8 ready! Message-ID: <56E40548.9030602@dumbbell.fr> In-Reply-To: <56E33ABB.7070402@dumbbell.fr> References: <56D9CE73.7040601@FreeBSD.org> <56DF3F20.8010208@FreeBSD.org> <CAMODbk=JihgYOQ_PHUmeDrOg4fQ8FmXY18T2ZHm-JJk70YEc4w@mail.gmail.com> <56E333CD.2020404@dumbbell.fr> <CAMODbkkUNk6HJxVLRAL42E9UBqb1rMKoKao5tye1uL2-EqRJcw@mail.gmail.com> <56E33ABB.7070402@dumbbell.fr>
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On 11/03/2016 22:38, Jean-S=C3=A9bastien P=C3=A9dron wrote:
> On 11/03/2016 22:32, Frederic Chardon wrote:
>>> Could you please send the whole core.txt.$n?
>>
>> Unfortunately no, I just have the full coredump. What should I do to g=
et it?
>=20
> You can use crashinfo(8). Something like:
> crashinfo -k /path/to/kernel
FYI, after off-list debugging, there are two problems:
1. The i915 page fault handler didn't handle the -ERESTARTSYS error
code returned by __wait_seqno() in case of a signal, causing the
page fault to fai instead of being restarted. This is fixed in
r296720.
2. Both the TTM and i915 page fault handlers remove the old page
before trying to service the fault. If the faul handling fails,
the page is NULL, causing the kernel to dereference a NULL
pointer. This is the panic reported by Fr=C3=A9d=C3=A9ric. A solut=
ion is
being discussed.
Note that after the fix in r296720, the i915 page fault handler will
succeed in this situation, so the panic described in #2 will not happen.
--=20
Jean-S=C3=A9bastien P=C3=A9dron
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