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From: Andrey Skvortsov <andrej.skvortzov@gmail.com>
To: Chris Wilson <chris@chris-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@intel.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, Sitsofe Wheeler <sitsofe@gmail.com>
Subject: Re: [Regression] BUG: unable to handle kernel NULL pointer dereference
Date: Sun, 1 Mar 2015 00:57:01 +0300	[thread overview]
Message-ID: <20150228215701.GA1732@nest> (raw)
In-Reply-To: <20150228211013.GB13459@nuc-i3427.alporthouse.com>


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On 28 Feb, Chris Wilson wrote:
> On Sat, Feb 28, 2015 at 03:20:37PM +0300, Andrey Skvortsov wrote:
> > Unfortunately this is not the last bug, that breaks i915/drm working
> > on my laptop. Sometimes system successfully loads with couple warnings mentioned in
> > previous mail:
> > 
> > [   26.922953] WARNING: CPU: 1 PID: 767 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x13f/0x288 [i915]()
> > [   26.922954] WARN_ON(obj->frontbuffer_bits)
> 
> That's inocuous, but for the serious hang, you may want to try
> video=SVIDEO-1:d on the kernel commandline to workaround the hang. (Check
> /sys/class/drm/card/ for the actual name of the connector for TV). I
> think Ville mentioned he was looking/looked at the atomic-vs-load_detect
> changes that is at the heart of the issue here. (Admittedly he did say
> it was worthy of a drink or two.)
> -Chris

Thank you for the help. I've tried to add to the kernel command line
'video=card0-SVIDEO-1:d video=card0-VGA-1:d'. But despite of that
kernel crashes with 'BUG: unable to handle kernel NULL pointer
dereference at' occasionally.

-- 
Best regards,
Andrey Skvortsov




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_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
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WARNING: multiple messages have this Message-ID (diff)
From: Andrey Skvortsov <andrej.skvortzov@gmail.com>
To: Chris Wilson <chris@chris-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@intel.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, Sitsofe Wheeler <sitsofe@gmail.com>
Subject: Re: [Intel-gfx] [Regression] BUG: unable to handle kernel NULL pointer dereference
Date: Sun, 1 Mar 2015 00:57:01 +0300	[thread overview]
Message-ID: <20150228215701.GA1732@nest> (raw)
In-Reply-To: <20150228211013.GB13459@nuc-i3427.alporthouse.com>

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On 28 Feb, Chris Wilson wrote:
> On Sat, Feb 28, 2015 at 03:20:37PM +0300, Andrey Skvortsov wrote:
> > Unfortunately this is not the last bug, that breaks i915/drm working
> > on my laptop. Sometimes system successfully loads with couple warnings mentioned in
> > previous mail:
> > 
> > [   26.922953] WARNING: CPU: 1 PID: 767 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x13f/0x288 [i915]()
> > [   26.922954] WARN_ON(obj->frontbuffer_bits)
> 
> That's inocuous, but for the serious hang, you may want to try
> video=SVIDEO-1:d on the kernel commandline to workaround the hang. (Check
> /sys/class/drm/card/ for the actual name of the connector for TV). I
> think Ville mentioned he was looking/looked at the atomic-vs-load_detect
> changes that is at the heart of the issue here. (Admittedly he did say
> it was worthy of a drink or two.)
> -Chris

Thank you for the help. I've tried to add to the kernel command line
'video=card0-SVIDEO-1:d video=card0-VGA-1:d'. But despite of that
kernel crashes with 'BUG: unable to handle kernel NULL pointer
dereference at' occasionally.

-- 
Best regards,
Andrey Skvortsov




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  reply	other threads:[~2015-02-28 21:57 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-03 19:15 [regression in linux-next] i915: broken graphics on laptop Andrey Skvortsov
2015-02-03 19:15 ` Andrey Skvortsov
2015-02-03 20:21 ` [Intel-gfx] " Chris Wilson
2015-02-03 20:21   ` Chris Wilson
2015-02-04 18:26   ` Andrey Skvortsov
2015-02-04 18:26     ` [Intel-gfx] " Andrey Skvortsov
2015-02-04 18:42     ` Chris Wilson
2015-02-04 18:42       ` Chris Wilson
2015-02-23 20:10       ` [Regression] WARNING: drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object Andrey Skvortsov
2015-02-23 20:10         ` [Intel-gfx] " Andrey Skvortsov
2015-02-23 20:12       ` Andrey Skvortsov
2015-02-23 20:12         ` [Intel-gfx] " Andrey Skvortsov
2015-02-23 21:20         ` Chris Wilson
2015-02-23 21:20           ` [Intel-gfx] " Chris Wilson
2015-02-23 23:42           ` Daniel Vetter
2015-02-23 23:42             ` Daniel Vetter
2015-02-28 12:20             ` Andrey Skvortsov
2015-02-28 12:20               ` [Intel-gfx] " Andrey Skvortsov
2015-02-28 21:10               ` Chris Wilson
2015-02-28 21:10                 ` Chris Wilson
2015-02-28 21:57                 ` Andrey Skvortsov [this message]
2015-02-28 21:57                   ` [Intel-gfx] [Regression] BUG: unable to handle kernel NULL pointer dereference Andrey Skvortsov
2015-03-01  8:29                   ` Chris Wilson
2015-03-01  9:30                     ` Andrey Skvortsov
2015-03-01  9:30                       ` [Intel-gfx] " Andrey Skvortsov
2015-03-01 10:28                       ` Chris Wilson
2015-03-01 10:28                         ` [Intel-gfx] " Chris Wilson
2015-03-05 14:27         ` [Intel-gfx] [Regression] WARNING: drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object Steven Rostedt
2015-03-16 15:45           ` Steven Rostedt
2015-03-16 16:43             ` Daniel Vetter
2015-03-16 16:43               ` Daniel Vetter
2015-03-16 17:21               ` Steven Rostedt
2015-03-16 17:21                 ` [Intel-gfx] " Steven Rostedt
2015-03-17  7:53                 ` Daniel Vetter
2015-03-17  7:53                   ` [Intel-gfx] " Daniel Vetter
2015-03-18  0:46                   ` Steven Rostedt
2015-03-18  8:30                     ` Jani Nikula
2015-03-18  8:30                       ` [Intel-gfx] " Jani Nikula

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