linux-kernel - Re: WARNING: at drivers/gpu/drm/i915/intel

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Date:	Sat, 3 Jan 2015 19:54:59 +0300
From:	Andrey Skvortsov <andrej.skvortzov@...il.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: WARNING: at drivers/gpu/drm/i915/intel_display.c:11375 [i915] in
 3.19-rc2

On Fri, Jan 02, 2015 at 09:42:01AM +0200, Jani Nikula wrote:
> On Thu, 01 Jan 2015, Andrey Skvortsov <andrej.skvortzov@...il.com> wrote:
> > Hi,
> >
> > this warning does not exist in 3.19-rc1, but it happens every boot in
> > 3.19-rc2. If you need any other information or data, I would be glad
> > to help to debug it.
> 
> Hmm, at a glance I can't find a commit that could be the culprit. Can
> you bisect between rc1 and rc2 to find the bad commit?

Sorry, my first message was not fully correct. As I tested this more,
it happens unfortunately not every boot. And this is not a regression,
because it happened couple of times with 3.19-rc1 too.

This warning seems to depend on the previously booted kernel. If I
boot the same kernel every time, it occurs very seldom. To
reproduce the warning I booted v3.19-rc2 and v3.19-rc1-g08b022a965 one after
another many times. In this case the warning happens with probability around 50%.

> > [   12.848428] ------------[ cut here ]------------
> > [   12.848479] WARNING: CPU: 1 PID: 328 at drivers/gpu/drm/i915/intel_display.c:11375 intel_crtc_set_config+0x3de/0xb36 [i915]()
> > [   12.848482] WARN_ON(!set->fb && (set->num_connectors != 0))

-- 
Best regards,
Andrey Skvortsov

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