linux-kernel - Re: git pull] drm for v4.1-rc1

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Message-ID: <1433750815.4364.13.camel@gmail.com>
Date:	Mon, 08 Jun 2015 11:06:55 +0300
From:	Ander Conselvan De Oliveira <conselvan2@...il.com>
To:	Stefan Lippers-Hollmann <s.l-h@....de>
Cc:	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>, Dave Airlie <airlied@...ux.ie>,
	Nicolas Kalkhof <nkalkhof@....de>,
	Jani Nikula <jani.nikula@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	torvalds@...ux-foundation.org
Subject: Re: git pull] drm for v4.1-rc1

On Sun, 2015-06-07 at 04:32 +0200, Stefan Lippers-Hollmann wrote:
> Hi
> 
> On 2015-06-07, Ville Syrjälä wrote:
> > On Fri, Jun 05, 2015 at 11:18:21PM +0200, Stefan Lippers-Hollmann wrote:
> > > Hi
> > > 
> > > On 2015-04-20, Dave Airlie wrote:
> > > [...]
> > > > The following changes since commit 09d51602cf84a1264946711dd4ea0dddbac599a1:
> > > > 
> > > >   Merge branch 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux (2015-04-19 14:31:41 -0700)
> > > > 
> > > > are available in the git repository at:
> > > > 
> > > >   git://people.freedesktop.org/~airlied/linux drm-next-merged
> > > > 
> > > > for you to fetch changes up to 2c33ce009ca2389dbf0535d0672214d09738e35e:
> > > > 
> > > >   Merge Linus master into drm-next (2015-04-20 13:05:20 +1000)
> > > [...]
> > > > Ander Conselvan de Oliveira (28):
> > > [...]
> > > >       drm/i915: Allocate connector state together with the connectors
> > > [...]
> > > 
> > > This commit introduces a regression relative to v4.0 on an Intel 
> > > D945GCLF2 mainboard[1] (Atom 330) with Intel 82945G/GZ onboard graphics 
> > > using its (only-) VGA connector for me.
> > > 
> > > v4.1-rc6-52-gff25ea8:
> > > [   13.265699] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
> > > [   13.265723] IP: [<ffffffffa0556f01>] intel_modeset_update_connector_atomic_state+0x61/0x90 [i915]
> > 
> > Hmm. Smells like a connector with a NULL state pointer, and the bad
> > commit touched exactly the part that sets it up. I can't immediately
> > spot any place where we'd forget to set it up though.
> > 
> > Can you try with something like this so we'd at least find out which
> > connector(s) is/are at fault here?
> 
> With the patch applied, the kernel (v4.1-rc6-104-g4b17069) locks up even
> harder, so I had to switch to a serial console in order to fetch the 
> boot messages:
> 
> [   13.492784] connector = ffff880079bb8000
> [   13.910439] connector = ffff8800795b5800
> [   14.463114] connector = ffff8800795b6000
> [   14.700707] connector = ffff8800795b6800
> [   14.869418] connector = ffff8800795b7000
> [   14.923848] connector = ffff8800795b7000
> 
> Full, gzipped, bootlog attached - thanks a lot for your efforts.

Could you repeat the process with drm.debug=0xe in your kernel command
line and send the logs again?

Thanks,
Ander

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