On Tue, Mar 24, 2015 at 12:49 PM, Daniel Vetter daniel@ffwll.ch wrote:
On Tue, Mar 24, 2015 at 05:48:31PM +0100, Daniel Vetter wrote:
On Tue, Mar 24, 2015 at 12:10:28PM -0400, Josh Boyer wrote:
On Tue, Mar 24, 2015 at 10:46 AM, Josh Boyer jwboyer@fedoraproject.org wrote:
On Tue, Mar 24, 2015 at 10:34 AM, Daniel Vetter daniel@ffwll.ch wrote:
On Tue, Mar 24, 2015 at 10:22:30AM -0400, Josh Boyer wrote:
On Tue, Mar 24, 2015 at 9:57 AM, Josh Boyer jwboyer@fedoraproject.org wrote: > On Tue, Mar 24, 2015 at 9:40 AM, Daniel Vetter daniel@ffwll.ch wrote: >> On Tue, Mar 24, 2015 at 09:15:32AM -0400, Josh Boyer wrote: >>> On Tue, Mar 24, 2015 at 3:32 AM, Daniel Vetter daniel@ffwll.ch wrote: >>> > On Mon, Mar 23, 2015 at 02:34:27PM -0400, Josh Boyer wrote: >>> >> On Mon, Mar 23, 2015 at 11:33 AM, Josh Boyer jwboyer@fedoraproject.org wrote: >>> >> >>> >> <snip> >>> >> >>> >> >> Xi Ruoyao (1): >>> >> >> drm/i915: Ensure plane->state->fb stays in sync with plane->fb >>> >> >>> >> Turns out to be that commit. >>> >> >>> >> git bisect start 'drivers/gpu/drm/i915/' >>> >> # good: [b314acaccd7e0d55314d96be4a33b5f50d0b3344] Merge branch >>> >> 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input >>> >> git bisect good b314acaccd7e0d55314d96be4a33b5f50d0b3344 >>> >> # bad: [bc465aa9d045feb0e13b4a8f32cc33c1943f62d6] Linux 4.0-rc5 >>> >> git bisect bad bc465aa9d045feb0e13b4a8f32cc33c1943f62d6 >>> >> # bad: [319c1d420a0b62d9dbb88104afebaabc968cdbfa] drm/i915: Ensure >>> >> plane->state->fb stays in sync with plane->fb >>> >> git bisect bad 319c1d420a0b62d9dbb88104afebaabc968cdbfa >>> >> # first bad commit: [319c1d420a0b62d9dbb88104afebaabc968cdbfa] >>> >> drm/i915: Ensure plane->state->fb stays in sync with plane->fb >>> >> >>> >> Doing a straight revert on top of 4.0-rc5 makes things work again, >>> >> albeit with the WARN_ON(obj->frontbuffer_bits) splat still being >>> >> there. >>> > >>> > Can you please test the tip of drm-fixes: >>> > >>> > commit 8218c3f4df3bb1c637c17552405039a6dd3c1ee1 >>> > Author: Daniel Vetter daniel.vetter@ffwll.ch >>> > Date: Fri Feb 27 12:58:13 2015 +0100 >>> > >>> > drm: Fixup racy refcounting in plane_force_disable >>> > >>> > http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=8218c3... >>> > >>> > Because fumble that patch didn't make it to drm-fixes a while ago and >>> > instead landed in drm-next. >>> >>> That seems to have helped with totally different issues a macbook I >>> have was seeing. However, it still doesn't fix the issue with the >>> Celeron based NUC machine. >>> >>> I built a kernel based on Linus' latest tree as of this morning, >>> without reverting 319c1d4 and adding the commit you pointed to. The >>> NUC still won't boot without HDMI connected. With HDMI connected I >>> still see the trace below. If I do the blacklist and then insmod >>> dance with HDMI unplugged it shows the same spew I reported yesterday >>> which starts with the same backtrace. >>> >>> I'll try building a kernel with 319c1d4 reverted + your patch. I >>> suspect things will work fine with that combination because the two >>> issues are unrelated. >> >> Can you please boot with drm.debug=0xff for the below case and grab >> complete dmesg? There'll be a lot of crap in the logs, you might need to >> blow up the logbuf size massively. But that log should contain everything >> I need to figure out where that framebuffer we're blowing up on is going. > > I provided both with HDMI attached and without (via insmod). If you > want them emailed directly let me know, but they were large. > > Boot with drm.debug=0xff and HDMI connected: > > https://jwboyer.fedorapeople.org/pub/drm-ff-dmesg.txt > > Boot with drm.debug=0xff without HDMI connected and i915 loaded via > manual insmod after boot: > > https://jwboyer.fedorapeople.org/pub/drm-ff-no-hdmi-insmod.txt
Here's one more from the macbook I mentioned. It's showing the same kref.h splat:
Ok there's at least one fixup for which we've failed to apply when porting the fb refcounting fix from -next. Can you please cherry-pick
commit f55548b5af87ebfc586ca75748947f1c1b1a4a52 Author: Damien Lespiau damien.lespiau@intel.com Date: Thu Feb 5 18:30:20 2015 +0000
drm/i915: Don't try to reference the fb in get_initial_plane_config()From linux-next?
Yes, building now. Will let you know as soon as I test it on both machines.
OK, with that commit applied I no longer get the kref.h splat and the NUC machine boots headless. I still see the backtrace below on both the NUC and the macbook. I have a copy of it with drm.debug=0xff from the NUC here:
https://jwboyer.fedorapeople.org/pub/nuc-drm-debug-ff-with-fixes.txt
Getting better at least :).
Ok thanks for testing. I'll look at that one tomorrow, wasted too much time with trying to resurrect a few machines that should have matched the common parts of what goes wrong here.
Jani, can you please cherry-pick the above commit to -fixes?
Actually add Jani this time around ... -Daniel
One more question: Is the frontbuffer_bits splat now also gone? That was the one I have no clue about, but since somewhere around 4.0-rc it started poppping up in a few places ... Thus far it was always the canary for some other bug though.
As far as I can tell, it's gone. I don't see it on any of my i915 machines running the kernel with those two patches. I'll keep an eye out for it as we work through 4.0-rcX.
josh