linux-kernel - 5.7-rc0: regression caused by drm tree, hangs while attempting to run X

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Message-ID: <20200403092634.GA3610@duo.ucw.cz>
Date:   Fri, 3 Apr 2020 11:41:10 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, intel-gfx@...ts.freedesktop.org,
        airlied@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com
Subject: 5.7-rc0: regression caused by drm tree, hangs while attempting to
 run X

Hi!

> > > > Hardware is thinkpad x220. I had this crash few days ago. And today I
> > > > have similar-looking one, with slightly newer kernel. (Will post
> > > > as a follow-up).
> > 
> > As part of quest for working system, I tried 5.7-rc0, based on
> > 
> > Merge: 50a5de895dbe b4d8ddf8356d
> > Author: Linus Torvalds <torvalds@...ux-foundation.org>
> > Date:   Wed Apr 1 18:18:18 2020 -0700
> > 
> > It hangs in userspace, at a time when X should be starting, and I'm
> > looking at blinking cursor.
> > 
> > 5.6-rcs worked, I'll test 5.6-final.
> 
> 5.6-final works.
> 
> Hmm...
> 
> commit f365ab31efacb70bed1e821f7435626e0b2528a6
> Merge: 4646de87d325 59e7a8cc2dcf
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Wed Apr 1 15:24:20 2020 -0700
> 
>     Merge tag 'drm-next-2020-04-01' of git://anongit.freedesktop.org/drm/drm
> 
> Let me test 4646de87d32526ee87b46c2e0130413367fb5362...that one works.
> 
> Ok, so obviously... I should
> test... f365ab31efacb70bed1e821f7435626e0b2528a6

f365ab31efacb70bed1e821f7435626e0b2528a6 is broken, and it is the
first broken merge. next-0403 is also broken.

Any ideas, besides the b-word?

Would c0ca be good commit for testing? 

commit 700d6ab987f3b5e28b13b5993e5a9a975c5604e2
Merge: c0ca5437c509 2bdd4c28baff
Author: Dave Airlie <airlied@...hat.com>
Date:   Mon Mar 30 15:56:03 2020 +1000

    Merge tag 'drm-intel-next-fixes-2020-03-27' of git://anongit.freedesktop.org
/drm/drm-intel into drm-next

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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