linux-kernel - Re: [Intel-gfx] [Regression] WARNING: drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free

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Message-ID: <20150228211013.GB13459@nuc-i3427.alporthouse.com>
Date:	Sat, 28 Feb 2015 21:10:13 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Andrey Skvortsov <Andrej.Skvortzov@...il.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, Sitsofe Wheeler <sitsofe@...il.com>
Subject: Re: [Intel-gfx] [Regression] WARNING:
 drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object

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

-- 
Chris Wilson, Intel Open Source Technology Centre
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