Date:	Wed, 01 Jul 2015 15:23:39 +0300
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Michal Hocko <mhocko@...e.cz>, Daniel Vetter <daniel@...ll.ch>
Cc:	Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org,
	"intel-gfx\@lists.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"Roper\, Matthew D" <matthew.d.roper@...el.com>
Subject: Re: WARNING: CPU: 0 PID: 3634 at drivers/gpu/drm/drm_irq.c:1141 drm_wait_one_vblank


+intel-gfx and Matt

On Wed, 01 Jul 2015, Michal Hocko <mhocko@...e.cz> wrote:
> On Wed 01-07-15 10:26:39, Daniel Vetter wrote:
>> On Tue, Jun 30, 2015 at 10:13:35PM +0200, Michal Hocko wrote:
>> > On Tue 30-06-15 18:59:29, Daniel Vetter wrote:
> [...]
>> > > Also it might be time to start bisecting this if you can readily reproduce it.
>> > 
>> > Yes, I can reproduce it just by switching to the text console. Sometimes
>> > it is the first attempt already but sometimes it takes several attempts.
>> > I will try to go back to 4.0 and bisect it then.
>> 
>> Yes please do, since this is a confusing regression I think the bisect
>> result will be the fastest way forward.
>
> OK, managed to bisect to cf4c7c12258e ("drm/i915: Make all plane
> disables use 'update_plane' (v5)") (CC people involved - the thread
> starts here: http://marc.info/?l=dri-devel&m=143566543432613&w=2 for
> your reference).
>
> I do not see the warning when I revert the commit directly on top of
> cf4c7c12258e but I cannot cleanly revert it on top of the current Linus'
> tree. Anything more I can give you to help to further debug the issue?
>
> Bisect log is:
> git bisect start
> # bad: [c517d838eb7d07bbe9507871fab3931deccff539] Linux 4.0-rc1
> git bisect bad c517d838eb7d07bbe9507871fab3931deccff539
> # good: [bfa76d49576599a4b9f9b7a71f23d73d6dcff735] Linux 3.19
> git bisect good bfa76d49576599a4b9f9b7a71f23d73d6dcff735
> # good: [02f1f2170d2831b3233e91091c60a66622f29e82] kernel.h: remove ancient __FUNCTION__ hack
> git bisect good 02f1f2170d2831b3233e91091c60a66622f29e82
> # bad: [796e1c55717e9a6ff5c81b12289ffa1ffd919b6f] Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
> git bisect bad 796e1c55717e9a6ff5c81b12289ffa1ffd919b6f
> # good: [9682ec9692e5ac11c6caebd079324e727b19e7ce] Merge tag 'driver-core-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
> git bisect good 9682ec9692e5ac11c6caebd079324e727b19e7ce
> # good: [a9724125ad014decf008d782e60447c811391326] Merge tag 'tty-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
> git bisect good a9724125ad014decf008d782e60447c811391326
> # bad: [f43dff0ee00a259f524ce17ba4f8030553c66590] Merge tag 'drm-amdkfd-next-fixes-2015-01-25' of git://people.freedesktop.org/~gabbayo/linux into drm-next
> git bisect bad f43dff0ee00a259f524ce17ba4f8030553c66590
> # good: [b942c653ae265abbd31032f3b4f5f857e5c7c723] Merge tag 'trace-sh-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
> git bisect good b942c653ae265abbd31032f3b4f5f857e5c7c723
> # good: [fcf3aac5fc307f0cae429f5844ddc25761662858] drm/i915: remove unused power_well/get_cdclk_freq api
> git bisect good fcf3aac5fc307f0cae429f5844ddc25761662858
> # bad: [4f4d89af78682f2ed1cf6745794804817f867bba] Merge tag 'drm-amdkfd-next-2015-01-09' of git://people.freedesktop.org/~gabbayo/linux into drm-next
> git bisect bad 4f4d89af78682f2ed1cf6745794804817f867bba
> # bad: [64387b613a43713d0e03d9d43bfbb1727e8475e1] drm/i915: Protect against leaks in pipe_crc_set_source
> git bisect bad 64387b613a43713d0e03d9d43bfbb1727e8475e1
> # good: [bfc882b4e30fbc169ecfe3508378623743806f56] drm/i915: Flatten engine init control flow
> git bisect good bfc882b4e30fbc169ecfe3508378623743806f56
> # good: [2b875c22fa77dfc895d3cf8287a553813d3e64c8] drm/i915: Make intel_plane_state subclass drm_plane_state
> git bisect good 2b875c22fa77dfc895d3cf8287a553813d3e64c8
> # bad: [15a17aae5f803551981a7acc6a4058b247a7452c] drm/i915: Check mask/bit helper functions
> git bisect bad 15a17aae5f803551981a7acc6a4058b247a7452c
> # bad: [146d84f0f2707bfe2c67114eeefac30da8584b3b] drm/i915: Fix up seqno -> request merge issues
> git bisect bad 146d84f0f2707bfe2c67114eeefac30da8584b3b
> # good: [c59cb179aaf444931cf9c547a514e383da3d2526] drm/i915: Consolidate top-level .update_plane() handlers
> git bisect good c59cb179aaf444931cf9c547a514e383da3d2526
> # bad: [cf4c7c12258ed9367f4fc45238f5f50d2db892c1] drm/i915: Make all plane disables use 'update_plane' (v5)
> git bisect bad cf4c7c12258ed9367f4fc45238f5f50d2db892c1
> # good: [e614c3c946ae5b50a679d65d2c981615d8ceccab] drm/i915: Ensure state->crtc is non-NULL for plane updates
> git bisect good e614c3c946ae5b50a679d65d2c981615d8ceccab
> # first bad commit: [cf4c7c12258ed9367f4fc45238f5f50d2db892c1] drm/i915: Make all plane disables use 'update_plane' (v5)
> -- 
> Michal Hocko
> SUSE Labs
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Technology Center
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