linux-kernel - Re: [Intel-gfx] [git pull] drm fixes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 24 Mar 2015 09:57:54 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...ux.ie>,
	Xi Ruoyao <xry111@...look.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [git pull] drm fixes

On Tue, Mar 24, 2015 at 9:40 AM, Daniel Vetter <daniel@...ll.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@...ll.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@...oraproject.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@...ll.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=8218c3f4df3bb1c637c17552405039a6dd3c1ee1
>> >
>> > 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

josh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/