Date: Wed, 8 Jul 2015 08:40:17 +0200
From: Michal Hocko <mhocko@suse.cz>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>,
        Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@intel.com>,
        LKML <linux-kernel@vger.kernel.org>, dri-devel@lists.freedesktop.org,
        "intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>,
        "Roper, Matthew D" <matthew.d.roper@intel.com>
Subject: Re: WARNING: CPU: 0 PID: 3634 at drivers/gpu/drm/drm_irq.c:1141
 drm_wait_one_vblank
Message-ID: <20150708064017.GA5335@dhcp22.suse.cz>
References: <20150630115707.GA4578@dhcp22.suse.cz>
 <20150630143249.GA30960@phenom.ffwll.local>
 <20150630160743.GA4590@dhcp22.suse.cz>
 <20150630165929.GB30960@phenom.ffwll.local>
 <20150630201335.GA4496@dhcp22.suse.cz>
 <20150701082639.GE30960@phenom.ffwll.local>
 <20150701121241.GB5010@dhcp22.suse.cz>
 <87twtoukvo.fsf@intel.com>
 <20150707084358.GS7568@phenom.ffwll.local>
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I have just tried to boot 4.2-rc1 and cannot seem to reproduce the issue
anymore.

On Tue 07-07-15 10:43:58, Daniel Vetter wrote:
[...]
> Can you please
> boot with drm.debug=0xf (lots more nois in dmesg with this) and reproduce?
> I only need the last few pages before the WARNING backtrace, just to
> understand a bit better what's going on there.

And 0xf debug level seem to paper over the problem because I do not see
the warning even with 4.1 where I am able to reproduce this reliably.
This suggests this is a timing sensitive issue.
-- 
Michal Hocko
SUSE Labs
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