Date: Sun, 21 Jul 2013 21:51:45 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Gustau P?rez i Querol <gperez@entel.upc.edu> Cc: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: Panic when starting X with Intel KMS Message-ID: <20130721185145.GE5991@kib.kiev.ua> In-Reply-To: <51EBAA76.8020100@entel.upc.edu> References: <51E6EB0A.2060407@entel.upc.edu> <51EA5166.4020508@entel.upc.edu> <CAPjTQNG7CBYNMQ4yitXv3Wy81YMk-osqcSH=BB1=HjsOqweszw@mail.gmail.com> <20130721071842.GZ5991@kib.kiev.ua> <51EBAA76.8020100@entel.upc.edu>
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On Sun, Jul 21, 2013 at 11:31:34AM +0200, Gustau P?rez i Querol wrote:
>=20
> > The issue happened somewhere before the process exit. Try the patch
> > below, the idea is that your overflow count is really big, so the
> > wrong-doer could cause underflow when acting.
> >
> > diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
> > index 19be4e0..fcdc6af 100644
> > --- a/sys/amd64/amd64/pmap.c
> > +++ b/sys/amd64/amd64/pmap.c
> > @@ -465,6 +465,9 @@ pmap_resident_count_dec(pmap_t pmap, int count)
> > {
> > =20
> > PMAP_LOCK_ASSERT(pmap, MA_OWNED);
> > + KASSERT(pmap->pm_stats.resident_count >=3D count,
> > + ("pmap %p resident count underflow %ld %d", pmap,
> > + pmap->pm_stats.resident_count, count));
> > pmap->pm_stats.resident_count -=3D count;
> > }
> > =20
> Hi,
>=20
> the assert doesn't happen (that's resident_count is not bigger than=
=20
> count). You can find the complete core at:
>=20
> https://dl.dropboxusercontent.com/u/2094962/core.txt.5
I do not understand what do you mean, it seems that core.txt.5 has
exactly the assertion fired which I added.
Show me the verbose dmesg, including the i915 driver attach.
Did the issue started at some moment, or it is a new install which
exhibit the problem from the beginning ? As a blind shot, try to
revert r252653.
I am sure that the serial console would be useful, but I did not decided
yet on where to start looking.
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