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

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Date:	Sun, 7 Jun 2015 04:32:53 +0200
From:	Stefan Lippers-Hollmann <s.l-h@....de>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Dave Airlie <airlied@...ux.ie>,
	Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@...el.com>,
	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

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.

Regards
	Stefan Lippers-Hollmann

Download attachment "D945GCLF2.dmesg.gz" of type "application/gzip" (15935 bytes)

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