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

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Date:   Tue, 13 Jun 2017 08:40:26 +1000
From:   Ben Skeggs <bskeggs@...hat.com>
To:     Takashi Iwai <tiwai@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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 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.

> 
> thanks,
> 
> Takashi
> 



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