linux-kernel - Re: [4.4.70 REGRESSION] Nouveau hangs up at boot

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Message-ID: <s5htw3k3teh.wl-tiwai@suse.de>
Date:   Tue, 13 Jun 2017 15:32:22 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Ben Skeggs <bskeggs@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Luigi Baldoni <aloisio@....com>, linux-stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [4.4.70 REGRESSION] Nouveau hangs up at boot

On Tue, 13 Jun 2017 08:08:17 +0200,
Takashi Iwai wrote:
> 
> On Tue, 13 Jun 2017 00:40:26 +0200,
> Ben Skeggs wrote:
> > 
> > On 06/10/2017 06:25 AM, Takashi Iwai wrote:
> > > Hi,
> > > 
> > > we've received a bug report about 4.4.70 kernel showing the hang up at
> > > boot.  And, this turned out to be a regression in nouveau driver:
> > >   https://bugzilla.suse.com/show_bug.cgi?id=1043467
> > > 
> > > I provided a test kernel reverting the last five commits about
> > > nouveau below, and it was confirmed to work.  But still not figured
> > > out which one actually breaks.
> > > 
> > > e4add1cf6b4154804350c3385c6d447cff3570de
> > >     drm/nouveau/tmr: handle races with hw when updating the next alarm time
> > >         commit 1b0f84380b10ee97f7d2dd191294de9017e94d1d upstream.
> > > 
> > > 9d78e40f5f41ad1db1849f8d15acbda99d0871b4
> > >     drm/nouveau/tmr: avoid processing completed alarms when adding a new one
> > >         commit 330bdf62fe6a6c5b99a647f7bf7157107c9348b3 upstream.
> > > 
> > > 5e07724c28f4e06fe42dd5b58bb6f9dd56510567
> > >     drm/nouveau/tmr: fix corruption of the pending list when rescheduling an alarm
> > >         commit 9fc64667ee48c9a25e7dca1a6bcb6906fec5bcc5 upstream.
> > > 
> > > 27f82df2f02688c51d2c1d9f624cc0c5b8a62661
> > >     drm/nouveau/tmr: ack interrupt before processing alarms
> > >         commit 3733bd8b407211739e72d051e5f30ad82a52c4bc upstream.
> > > 
> > > 3819271d8a5f4c6e0c8f71c339e44e2efbe40710
> > >     drm/nouveau/therm: remove ineffective workarounds for alarm bugs
> > >         commit e4311ee51d1e2676001b2d8fcefd92bdd79aad85 upstream.
> > > 
> > > 
> > > Ben, is this a known problem?  Or is there any fixup?
> > > The kernel back trace found in the bugzilla report shows the issue in
> > > nvkm_timer_alarm_trigger(), at least.
> > > 
> > A fix (b4e382ca7586a63b6c1e5221ce0863ff867c2df6) has been submitted already.
> > 
> > Sorry for the trouble!
> > Ben.
> 
> Hrm, the commit doesn't apply to 4.4.x kernel properly.

My bad, it *does* apply.  I must have looked at a wrong commit, sorry
for the noise!

> Could you cook up a 4.4.x fix?  Then I'll prepare a test kernel
> package for Luigi, so that he can test quickly.

Luigi, a new test kernel is being built in OBS home:tiwai:bnc1043467-2
repo.  Please give it a try.


thanks,

Takashi