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From: Takashi Iwai <tiwai@suse.de>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Ben Skeggs <bskeggs@redhat.com>
Cc: "Luigi Baldoni" <aloisio@gmx.com>,
	linux-stable@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [4.4.70 REGRESSION] Nouveau hangs up at boot
Date: Fri, 09 Jun 2017 22:25:13 +0200	[thread overview]
Message-ID: <s5hefus3o46.wl-tiwai@suse.de> (raw)

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.


thanks,

Takashi

             reply	other threads:[~2017-06-09 20:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-09 20:25 Takashi Iwai [this message]
2017-06-12 22:40 ` [4.4.70 REGRESSION] Nouveau hangs up at boot Ben Skeggs
2017-06-13  6:08   ` Takashi Iwai
2017-06-13 13:32     ` Takashi Iwai
2017-06-13 14:42       ` Luigi Baldoni
2017-06-15  6:39       ` Greg Kroah-Hartman

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